Academic literature on the topic 'DHTT11 Temperature and humidity sensor'
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Journal articles on the topic "DHTT11 Temperature and humidity sensor"
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Sudaryanto, Aris, Yohanes Aditya Wisnu Wardana, and Agung Kridoyono. "Accuracy of DHT11 Temperature and Humidity Sensor In Egg Incubator." Informatics, Electrical and Electronics Engineering (Infotron) 4, no. 1 (2024): 1–6. http://dx.doi.org/10.33474/infotron.v4i1.20846.
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Temperature and humidity are two parameters that need to be considered in hatching eggs. The research results showed that the difference in egg temperature in the incubator gave a significant difference in fertility, mortality, and hatchability. One of the most widely used temperature and humidity sensors is the DHT11 sensor. The objective of this research is to determine the accuracy of the DHT11 sensor in measuring temperature and humidity. This study uses the UT333 sensor as a reference for measuring temperature and humidity. The temperature measurement test is done with the DHT11 and UT333 sensors measuring the temperature at the same place and time, and then the difference is calculated as an error value. Humidity testing is done by the DHT11 and UT333 sensors measuring humidity at the same time and place and using a humidifier to provide variations in humidity levels. The difference in humidity between DHT11 and UT333 was then calculated as an error. Each temperature and humidity test was repeated 25 times. Based on all the tests, it was found that the DHT11 sensor has an average error value of 3.16% or an accuracy of 96.84% for temperature measurements and an average error of 7.07% or an accuracy of 92.93% for humidity measurements. The average success value for temperature and humidity testing is 94.89%.
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Rahayu, Intan Dwi, and Mhd Basri. "Automatic Fan Design Based on Microcontroller with Combination of DHT11 Sensor and Motion Sensor." Hanif Journal of Information Systems 2, no. 1 (2024): 31–37. http://dx.doi.org/10.56211/hanif.v2i1.27.
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The development of a more sophisticated fan is a necessity. One way to improve fan performance is to add temperature and humidity sensors, so that the fan can rotate automatically according to the desired temperature and humidity. By using the Arduino Nano microcontroller, DHT11 sensor and Motion PIR sensor, the fan can be controlled automatically and can rotate at a speed set according to the temperature and humidity measured by the DHT11 sensor, and can detect whether there are people inside by using the Motion PIR sensor. That way, the fan can work more effectively and efficiently in maintaining coolness and air quality in the room. In addition, the use of microcontrollers, DHT11 sensors, and PIR motion sensors also makes it easier for users to manage fans and maintain temperature and humidity in the room more easily. Therefore, by utilizing the DHT11 sensor and PIR sensor and controlled by the Arduino Nano microcontroller. The test results obtained are the fan will turn on in a temperature condition of 30oc or there are people in the room and the fan will turn off if it does not meet these conditions. With a system like this it will extend the life of the fan and make it practical in turning on and off the fan.
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Ritter, Greice Scherer, Eliezer Oliveira Cavalheiro, Ronaldo Barcelos e. Silva, Leonardo Da Rosa Schmidt, and Silvana Maldaner. "Medidas de temperatura em ambiente interno usando a Plataforma Arduino." Ciência e Natura 42 (February 7, 2020): 35. http://dx.doi.org/10.5902/2179460x40637.
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The paper presents the results of a study with temperature measurements using low cost sensors connected to an Arduino microcontroller. To perform the study, three sensors widely used for monitoring environmental conditions with Arduino. The selected sensors were the LM35DZ (analog sensor) and DHT11 and DHT22 (digital sensors). The LM35DZ sensor is a sensor known to be an analog sensor that has linear temperature response with voltage. The DHT11 sensor measures temperature and humidity simultaneously. To measure temperature the DHT11 sensor uses a temperature-sensitive resistor and has a measurement range from 0 to 50 °C, with an uncertainty ± 2% ° C. The DHT22 has a measurement range -40 to 80 ° C and an uncertainty ± 1% ° C. Simultaneous temperature measurements with the three sensors showed good performance in indoor situations, showing the maximum and minimum temperatures of a daily temperature cycle.
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Lestari, Puji, Tasmi, and Fery Antony. "SISTEM PENYIRAMAN BUDIDAYA TANAMAN CABAI BERDASARKAN PENGUKURAN SUHU DAN KELEMBABAN TANAH." Journal of Intelligent Networks and IoT Global 1, no. 1 (2023): 20–32. http://dx.doi.org/10.36982/jinig.v1i1.3080.
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The process of growing peppers requires extra attention important to maintaining soil moisture. The intensity of temperature and humidity in chili plants can make it easier for farmers to measure soil conditions and make it easier for farmers to monitor the quality of the chili they grow. In this study, the progression of an Internet of Things (IoT)-based system was performed out. To monitor and find out the temperature and humidity and can carry out the plant watering system automatically. NodeMcu ESp32 microcontroller as a data center, with temperature values taken from DHT11 sensors and humidity values from Soil Moisture sensors. This soil moisture control system works at temperatures of more than 20°C and humidity levels of more than 70% so that the system can control the water pump according to the measured level of soil moisture. From the results of experiments that have been carried out testing chili plants with a Soil Moisture sensor, the dry soil output value is >=70% with a temperature from the DHT11 sensor of 33.30 °C and a wet soil output value of <=60% with a temperature from the DHT11 sensor of 29.00°C has an accurate value with what has been tested with several conditions that have been made previously
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Alfith, Alfith, Asnal Effendi, Aswir Premadi, and Yogi Saputra. "PENGUJIAN SUHU DAN KELEMBAPAN PADA ALAT PENGERING GABAH MENGGUNANAKAN SENSOR DHT11." Ensiklopedia of Journal 4, no. 2 (2022): 243–47. http://dx.doi.org/10.33559/eoj.v4i2.1074.
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Many kinds of sensors for measuring temperature or humidity, such as LM35, DS18S20 and DHT11. To measure temperature and humidity in mushrooms, you can choose the DHT11 sensor. The DHT11 has a calibrated digital output. This sensor consists of a resistive type humidity measuring component and temperature measurement via NTC and is connected to 8 bits, so that it gives quite good results, sufficient response speed, has good resistance to interference. The interface used is a single write serial interface which is quite fast and easy. The sensor size is small, the need for low power consumption and is able to transmit its output within a distance of 20 meters. The DHT11 sensor can be used for measuring room temperature, measuring incubator temperature and humidity and others. If the sensor distance is less than 20 meters, it is necessary to install a 5KΩ pull-up resistor on the data pin. Meanwhile, if the distance is more than 20 meters, it is necessary to adjust the size of the pull up resistor. The power supply required for this DHT11 ranges from 3.5V to 5V. Access to the sensor is only allowed more than 1 second after the first power supply is provided.
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Haller, Manju. "DHT11 Sensor: A Comprehensive Study on Temperature and Humidity Sensor." INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 08, no. 03 (2024): 1–11. http://dx.doi.org/10.55041/ijsrem29310.
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The DHT11 sensor is a fundamental component in the realm of sensor technology, offering a simple yet effective solution for measuring temperature and humidity. This paper presentation aims to provide a comprehensive overview of the DHT11 sensor, highlighting its key attributes, operating principles, and practical applications. It is a compact and affordable sensor that utilizes a capacitive humidity sensor and a thermistor to accurately measure both temperature and humidity. Its digital output makes it easy to interface with microcontrollers and data acquisition systems, making it a popular choice for DIY enthusiasts, hobbyists, and professionals alike. Keywords: 1.Arduino IDE program software. 2.Development board ESP8266. 3.DHT 11
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S., Dharani, Gayathri P., Muthukumar M., and Menaga S. "Measurement of Temperature and Humidity Using DHT11 Sensor." Journal of Advancement in Communication System 2, no. 3 (2020): 1–3. https://doi.org/10.5281/zenodo.3605533.
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<em>Temperature and humidity are common factors of environment. Humidity is a measure of water vapor present in air. The level of temperature and humidity in air affects various physical, chemical, and biological processes. The measurement of these parameters could be effectively employed in agriculture and horticulture. An optimum level of temperature and humidity is required for better growth of plants and so, when these parameters are known, it would be easier to predict the most appropriate level of water to be irrigated according to the weather and climate. The technology can be implemented by using arduino, I2C module, LCD display, and a DHT11 sensor</em><em>.</em><em> The DHT11 sensor senses the changes in temperature and humidity observed in the environment. This technology is more reliable and more stable. The response is fast with outstanding quality. The wired network can be replaced by using a sensor for measurement of temperature as well as humid content more accurately and without hazardous problems<strong>. </strong></em>
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Adi, Puput Dani Prasetyo. "ZigBee Test Performance with DHT11 Temperature sensor." Internet of Things and Artificial Intelligence Journal 1, no. 1 (2021): 50–62. http://dx.doi.org/10.31763/iota.v1i1.360.
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This study aims to examine the ability and Performance or Quality of Services of the IEEE 802.15.4 or ZigBee Radio Frequency module on the sensor node ZigBee based. Furthermore, ZigBee's communication capabilities i.e., Tree, Star, and mesh networking were developed on the internet or Internet of Thing using RaspBerryPi 4 as the Internet Gateway. The sensors used e.g., Pulse sensor and temperature and Humidity Sensor. Moreover, the Spectrum Analyzer is used to measure the Radio Frequency Value (-dBm) per Channel (CH1 to CH12) on the Zigbee module (EDs and CN) communication at different distances,on the Mesh or Tree ZigBee Communication, ZR can be used, at Point to Point ZigBee, the role of ZR is neglected. Energy efficiency battery ZigBee sensor nodes need to be considered to obtain sensor nodes Long Life, moreover, RSSI (-dBm) is the key to the analysis of sensor node communication systems on different sensor node clustering, including Throughput, PacketLoss sensor data, and data analysis on Application Server.
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Fathurrahmani, Fathurrahmani, Wiwik Kusrini, Khairul Anwar Hafizd, and Arif Supriyanto. "Penerapan Sistem Tertanam untuk Monitoring Kandang Ayam Broiler." MATRIK : Jurnal Manajemen, Teknik Informatika dan Rekayasa Komputer 19, no. 1 (2019): 53–61. http://dx.doi.org/10.30812/matrik.v19i1.490.
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Broilers are fast growing animals that are influenced by environmental conditions. Routine monitoring is needed, especially temperature, humidity and ammonia levels. In this study, the authors propose an embedded system that can detect temperature, humidity and ammonia levels. This system works by sending temperature, humidity and ammonia gas information routinely once a day to the henhouse operator via text message (SMS), or information will be sent if environmental conditions are above/below the threshold. The embedded system was built using microcontrollers, temperature and humidity sensors as well as ammonia sensors. The microcontroller uses Arduino. Temperature and humidity sensors use DHT11, while the ammonia level sensor uses MQ-135. Embedded system communication uses the GSM SIM800L module, this module is responsible for sending the henhouse environmental conditions to the operator via SMS. Testing is done in two stages, namely functionality and connectivity. The functionality test proves that the sensor can produce information on temperature, humidity and ammonia levels by comparing it with conventional tools. The connectivity test proves that the GSM SIM800L module can send monitoring data every day and certain conditions.
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Kalagate, N. K., and A. A. Joshi. "Weather Monitoring using IOT." Research and Applications: Embedded System 6, no. 1 (2023): 1–4. https://doi.org/10.5281/zenodo.7575549.
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<em>A weather monitoring can be described as a device, which provides us with the information of the weather in our nearby environment. This device provide details about the nearby environmental changes such as temperature, barometric pressure, humidity, etc. this device senses, pressure, humidity, light intensity, temperature. For example by using temperature and humidity we can measure humidification in environment. In addition to the above mentioned functionalities, we have also enabled to monitor the atmospheric pressure of the room. We can also monitor the rain value. We used ESP8266 based Wi-Fi module. The NodeMCU is connected to four sensors, including a raindrop module, a temperature and humidity sensor (DHT11), a pressure sensor (BMP180), and a light dependent resistor (LDR). Whenever these values exceed a chosen threshold limit for each an SMS, an E-mail published alerting the owner of the appliance.</em>
Dissertations / Theses on the topic "DHTT11 Temperature and humidity sensor"
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Johari, Houri. "Development of MEMS Sensors for Measurements of Pressure, Relative Humidity, and Temperature." Digital WPI, 2003. https://digitalcommons.wpi.edu/etd-theses/815.
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Continued demands for better control of the operating conditions of structures and processes have led to the need for better means of measuring temperature (T), pressure (P), and relative humidity (RH). One way to satisfy this need is to use MEMS technology to develop a sensor that will contain, in a single package, capabilities to simultaneously measure T, P, and RH of its environment. Because of the advantages of MEMS technology, which include small size, low power, very high precision, and low cost, it was selected for use in this thesis. Although MEMS sensors that individually measure T, P, and RH exist, there are no sensors that combine all three measurements in a single package. In this thesis, a piezoresistive pressure sensor and capacitive humidity sensor were developed to operate in the range, of 0 to 2 atm and 0% to 100%, respectively. Finally, a polysilicon resistor temperature sensor, which can work in the range of -50ºC to 150ºC, was analyzed. Multimeasurement capability will make this sensor particularly applicable for point-wise mapping of environmental conditions for advanced process control. In this thesis, the development of sensors for such an integrated device is outlined. Selected results, based on the use of analytical, computational, and experimental solutions (ACES) methodology, particularly suited for the development of MEMS sensors, are presented for the pressure, relative humidity, and temperature sensors.
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Borkar, Chirag. "Development of Wireless Sensor Network System for Indoor Air Quality Monitoring." Thesis, University of North Texas, 2012. https://digital.library.unt.edu/ark:/67531/metadc177181/.
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This thesis describes development of low cost indoor air quality (IAQ) monitoring system for research. It describes data collection of various parameters concentration present in indoor air and sends data back to host PC for further processing. Thesis gives detailed information about hardware and software implementation of IAQ monitoring system. Also discussed are building wireless ZigBee network, creating user friendly graphical user interface (GUI) and analysis of obtained results in comparison with professional benchmark system to check system reliability. Throughputs obtained are efficient enough to use system as a reliable IAQ monitor.
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Tangirala, Phani. "DEVELOPMENT AND VALIDATION OF A SPECIAL PURPOSE SENSOR AND PROCESSOR SYSTEM TO CALCULATE EQUILIBRIUM MOISTURE CONTENT OF WOOD." UKnowledge, 2005. http://uknowledge.uky.edu/gradschool_theses/256.
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Percent Moisture Content (MC %) of wood is defined to be the weight of the moisture in the wood divided by the weight of the dry wood times 100%. Equilibrium Moisture Content (EMC), moisture content at environmental equilibrium is a very important metric affecting the performance of wood in many applications. For best performance in many applications, the goal is to maintain this value between 6% and 8%. EMC value is a function of the temperature and the relative humidity of the surrounding air of wood. It is very important to maintain this value while processing, storing or finishing the wood. This thesis develops a special purpose sensor and processor system to be implemented as a small hand-held device used to sense, calculate and display the value of EMC of wood depending on surrounding environmental conditions. Wood processing industry personnel would use the hand-held EMC calculating and display device to prevent many potential problems that can show significant affect on the performance of wood. The design of the EMC device requires the use of sensors to obtain the required inputs of temperature and relative humidity. In this thesis various market available sensors are compared and appropriate sensor is chosen for the design. The calculation of EMC requires many arithmetic operations with stringent precision requirements. Various arithmetic algorithms and systems are compared in terms of meeting required arithmetic functionality, precision requirements, and silicon implementation area and gate count, and a suitable choice is made. The resulting processor organization and design is coded in VHDL using the Xilinx ISE 6.2.03i tool set. The design is synthesized, validated via VHDL virtual prototype simulation, and implemented to a Xilinx Spartan2E FPGA for experimental hardware prototype testing and evaluation. It is tested over various ranges of temperature and relative humidity. Comparison of experimentally calculated EMC values with the theoretical values of EMC derived for corresponding temperature and relative humidity points resulted in validation of the EMC processor architecture, functional performance and arithmetic precision requirements.
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Lander, Jasmine. "Cost-efficient approaches to measure carbon dioxide (CO2) under different environmental factors such as temperature and humidity using mini loggers." Thesis, Linköpings universitet, Institutionen för tema, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-165993.
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Fluxes of carbon dioxide (CO2), being a major greenhouse gas, are of great importance to understand and monitor. Findings have shown that while CO2 emissions enhanced by humans triggered the greenhouse gas effect, several significant CO2 fluxes in nature that are climate sensitive may still be poorly constrained, especially those from inland waters and its surrounding soils and sediments. This including different processes such as decomposers degrading organic material. At present, direct measurements of CO2 from soils, waters or CO2 concentrations in surface water, are typically labour intensive or require costly equipment. Therefore, small inexpensive CO2 mini loggers, originally made for indoor air quality monitoring, are for this project being developed further for field use, as a convenient equipment to measure CO2 emissions. However, a requirement is that the mini loggers are stable and robust against interference by other air components, including water vapour, and physical factors such as temperature. Therefore, the mini loggers were for this project studied further under different environmental conditions such as temperature and humidity in a controlled environment. The results were analysed using multiple regression analysis where the CO2 concentration (CO2), measured by the LGR instrument, versus the logger IR signal (IR), temperature (T) and relative humidity (RH) were studied. Unlike some previous studies, this project studied a large CO2 concentration interval (400 – 10 000 ppm). The results show that there was a strong regression for IR versus CO2. The regression for both RH and the T was on the other hand very weak. However, there were factors that could have affected the mini logger. This since it was noticed that the mini loggers’ ability to calculate the CO2 concentration was worsened when the humidity was increased during the experiments. It is believed that the cause was condensed water, gathering in the inner parts of the mini logger. This because the sensor chamber had a lower temperature than the hot air entering the sensor chamber from the humidity bottle, together with the CO2, leading to condensation. Hence, prevention of condensation inside the measurement cell is important. However, the results from the analysis shows that the factors; RH and T do not need to be taken into account when studying the CO2 concentration over a larger interval, as long as the conditions are not condensing.
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Horváth, Michal. "Zařízení pro monitorování teploty a vlhkosti s bezdrátovým přenosem dat." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413179.
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The diploma thesis is about designing device which monitors temperature and humidity. In the first part of thesis are explained basic terms, importance of key variables and on market offered products are described. After that the thesis describes device concept design with schematic designs. From designed schematics are described printed circuit board designs. Next part is about device commissioning and correction of errors caused by incorrect design. Last part is about program designing and device testing.
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Müller, Christian, Ammar Al-Hamry, Olfa Kanoun, et al. "Humidity Sensing Behavior of Endohedral Li-Doped and Undoped SWCNT/SDBS Composite Films." MDPI AG, 2019. https://monarch.qucosa.de/id/qucosa%3A33173.
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We have investigated single-walled carbon nanotube (SWCNT) networks wrapped with the cationic surfactant sodium dodecyl-benzenesulfonate (SBDS) as promising candidates for water detection. This is the first time that the humidity behavior of endohedral Li-doped (Li@) and undoped SWCNTs/SDBS has been shown. We identified a strong and almost monotonic decrease in resistance as humidity increased from 11 to 97%. Sensitivities varied between −3 and 65% in the entire humidity range. Electrical characterization, Raman spectroscopy, and high-resolution transmission electron microscopy (HRTEM) analysis revealed that a combination of the electron donor behavior of the water molecules with Poole-Frenkel conduction accounted for the resistive humidity response in the Li@SWCNT/SDBS and undoped SWCNT/SDBS networks. We found that Li@SWCNTs boosted the semiconducting character in mixtures of metallic/semiconducting SWCNT beams. Moreover, electrical characterization of the sensor suggested that endohedral Li doping produced SWCNT beams with high concentration of semiconducting tubes. We also investigated how frequency influenced film humidity sensing behavior and how this behavior of SWCNT/SDBS films depended on temperature from 20 to 80 ∘ C. The present results will certainly aid design and optimization of SWCNT films with different dopants for humidity or gas sensing in general.
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Manhique, A. J. (Arao Joao). "Titania recovery from low-grade titaniferrous minerals." Thesis, University of Pretoria, 2012. http://hdl.handle.net/2263/24305.
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Titanium dioxide or titania is applied in paints, in the paper industry, fibbers, cosmetics, sunscreen products, toothpaste, foodstuffs, optical coatings, beam splitters and anti-reflection coatings. It is also used as support catalyst and its use as humidity and high-temperature oxygen sensor is under consideration. These applications are related to its high refractive index, oil absorption, tinting strength and inert chemical properties. Commonly, titania is recovered either by leaching ilmenite with sulphuric acid and subsequently hydrolysing the resulting sulfate solution by boiling. In another process, titanium feedstock is converted into titanium tetrachloride and further oxidised to titanium dioxide. These methods are reportedly time-consuming and environmentally unfriendly. They are also unable to use all existing types of titanium minerals. In this study, a novel process for the extraction of titanium valuables from its minerals is presented. The process entails the roasting of titanium ore with alkaline metal salt. The roasted product is hydrolysed with water and acid, and subsequently reacted with sulphuric acid. Alternatively, the hydrolysed product can be used as feedstock in the chloride process. Roasting at 900°C and using a 2:1 (NaOH:ilmenite) mole ratio proved to be the most efficient in releasing titanium units from its ore. Ternary phases dominate under these conditions. Na0.75Fe0.75Ti0.25O2 was the dominant titanium-bearing phase. NaFeTiO4a ndNa2Fe2Ti3O10 were also present. Whenever the Ti:Fe atom ratio was different from one, the surplus titanium was accommodated in single titanates, mainly Na2TiO3, while iron was accommodated in NaFeO2. In many cases Na8Ti5O14 was also present as a result of Na2TiO3 polymerisation. This is consistent with a fusion period of one hour or more. Shorter fusion periods tended to produce binary phases. Similar results were obtained when lower fusion temperatures were employed, i.e. below 550°C. When anatase reactant was used to resemble an anatase ore, Na2Ti6O3,Na2TiO3, Na8Ti5O14 and Na16Ti10O28 were identified in the products. Optimum recoveries were obtained using a 1:1 NaOH:TiO2 mole ratio, and fusing at 800°C for 2 h. Close to 100% of the titanium was recovered. A one-step leaching process was found to be effective compared with multi-step leaching. The leaching step was found to be dependent on time, solid:liquid ratio and temperature. The optimum conditions for solid:liquid ratio, time and temperature were found to be 0.20, and 15 min at 75°C, respectively. Acidic hydrolysis was controlled by the relative amount of iron and titanium in solution. It was found that less than 1% was dissolved between 3 and 7 in pH units. Higher pH values are recommended, since less acid will be used. Any excess of sulphuric acid in the sulfation step proved to be unnecessary. No significant changes were observed in the amount of dissolved iron and titanium. Therefore the stoichiometric amount can be used in the sulfation process.<br>Thesis (PhD)--University of Pretoria, 2012.<br>Chemistry<br>unrestricted
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Suzuki, Takeharu, and n/a. "Integrated, Intelligent Sensor Fabrication Strategies for Environmental Monitoring." Griffith University. School of Microelectronic Engineering, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20040813.131206.
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The humidity, temperature, wind speed/direction micro sensors can be manufactured individually, resulting in three individual substrates. The integration of the three sensors into a single substrate is a vital challenge to achieve an integrated intelligent sensor so called a multiple sensor. This requires the integration of process flows and is a major challenge because adequate sensor performance must be maintained. Polyimide was selected as a humidity sensing material for its compatibility with conventional integrated circuit fabrication technology, negligible temperature dependence and good resistance against contamination. Nickel was selected for the temperature and wind speed/direction sensor because of its useful temperature coefficient and the advantage of its cost. Since the known wet etchant for nickel requires hard-baked photoresist, a method which does not attack the polyimide while removing the photoresist must be developed. The method developed for etching nickel employs hard-bake-free photoresist. Other challenge was ensuring good thermal isolation for the wind speed/direction sensor fabricated on a silicon nitride layer preformed on top of a silicon wafer. Since silicon acts as a good heat sink, the silicon under the sensor was etched entirely away until the silicon nitride layer was reached. This structure achieved good thermal isolation resulting in small power consumption. This low power feature is essential for sensors deployed in fields where power access or replacement of power sources is restricted. This structure was compared with the structure created by polyimide plateau on a silicon nitride layer coated on a silicon substrate as a function of power consumption. Based on the examination of thermal isolation, the multiple sensor utilizing a MEMS technique was fabricated with a single-sided mask aligner. The characteristics of humidity sensors fabricated with polyimide were examined in detail with respect to variations of electrode structures, improvement of sensitivity, effect of process temperature, temperature and frequency dependence, and stability. The humidity sensor constructed with O2 plasma treated polyimide resulted an improvement in sensitivity and hysteresis. The investigation using XPS, FTIR and AFM concluded the chemical modification of polyimide played an important role in this improvement. The design, fabrication and results of a series of humidity sensors are quantified. There is always no unique packaging solution for sensors because of the application-specific nature of the sensors. This intelligent environmental monitoring system was designed to accommodate both an environmental sensor and its signal conditioning electronics circuitry (SICONEC) into a single package. The environmental sensors need direct exposure to the environment while SICONEC needs a sealed encapsulation to avoid environmental damage. A new style of packaging addressing these requirements was demonstrated using a hot embossing machine. The hot embossing machine was used to embed an integrated circuit (IC) in a bare die condition into a polycarbonate (PC) sheet. In this case, the IC was flipped down against the PC, which protects the front side of the IC from the environmental damages. In a test phase, a die containing operational amplifiers was embossed into the PC. A humidity sensor and surface mount resisters were placed on the same surface of the PC to test the validity of this new technique. Interconnection between the embossed die and the humidity sensor was established using bonding wires. Copper tracks were also used to ensure all electrical connections for the die, the humidity sensor and the resistors. The results clarified the method developed. Details of process methods, issues and further potential improvement are reported.
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Suzuki, Takeharu. "Integrated, Intelligent Sensor Fabrication Strategies for Environmental Monitoring." Thesis, Griffith University, 2004. http://hdl.handle.net/10072/367295.
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The humidity, temperature, wind speed/direction micro sensors can be manufactured individually, resulting in three individual substrates. The integration of the three sensors into a single substrate is a vital challenge to achieve an integrated intelligent sensor so called a multiple sensor. This requires the integration of process flows and is a major challenge because adequate sensor performance must be maintained. Polyimide was selected as a humidity sensing material for its compatibility with conventional integrated circuit fabrication technology, negligible temperature dependence and good resistance against contamination. Nickel was selected for the temperature and wind speed/direction sensor because of its useful temperature coefficient and the advantage of its cost. Since the known wet etchant for nickel requires hard-baked photoresist, a method which does not attack the polyimide while removing the photoresist must be developed. The method developed for etching nickel employs hard-bake-free photoresist. Other challenge was ensuring good thermal isolation for the wind speed/direction sensor fabricated on a silicon nitride layer preformed on top of a silicon wafer. Since silicon acts as a good heat sink, the silicon under the sensor was etched entirely away until the silicon nitride layer was reached. This structure achieved good thermal isolation resulting in small power consumption. This low power feature is essential for sensors deployed in fields where power access or replacement of power sources is restricted. This structure was compared with the structure created by polyimide plateau on a silicon nitride layer coated on a silicon substrate as a function of power consumption. Based on the examination of thermal isolation, the multiple sensor utilizing a MEMS technique was fabricated with a single-sided mask aligner. The characteristics of humidity sensors fabricated with polyimide were examined in detail with respect to variations of electrode structures, improvement of sensitivity, effect of process temperature, temperature and frequency dependence, and stability. The humidity sensor constructed with O2 plasma treated polyimide resulted an improvement in sensitivity and hysteresis. The investigation using XPS, FTIR and AFMconcluded the chemical modification of polyimide played an important role in this improvement. The design, fabrication and results of a series of humidity sensors are quantified. There is always no unique packaging solution for sensors because of the application-specific nature of the sensors. This intelligent environmental monitoring system was designed to accommodate both an environmental sensor and its signal conditioning electronics circuitry (SICONEC) into a single package. The environmental sensors need direct exposure to the environment while SICONEC needs a sealed encapsulation to avoid environmental damage. A new style of packaging addressing these requirements was demonstrated using a hot embossing machine. The hot embossing machine was used to embed an integrated circuit (IC) in a bare die condition into a polycarbonate (PC) sheet. In this case, the IC was flipped down against the PC, which protects the front side of the IC from the environmental damages. In a test phase, a die containing operational amplifiers was embossed into the PC. A humidity sensor and surface mount resisters were placed on the same surface of the PC to test the validity of this new technique. Interconnection between the embossed die and the humidity sensor was established using bonding wires. Copper tracks were also used to ensure all electrical connections for the die, the humidity sensor and the resistors. The results clarified the method developed. Details of process methods, issues and further potential improvement are reported.<br>Thesis (PhD Doctorate)<br>Doctor of Philosophy (PhD)<br>School of Microelectronic Engineering<br>Full Text
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Декет, Руслан Іванович, та Ruslan Deket. "Комп’ютерна система керування параметрами мікроклімату теплиці". Bachelor's thesis, Тернопільський національний технічний університет імені Івана Пулюя, 2021. http://elartu.tntu.edu.ua/handle/lib/35561.
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Комп’ютерна система керування параметрами мікроклімату теплиці // Кваліфікаційна робота на здобуття освітнього ступеня бакалавр // Декет Руслан Іванович // ТНТУ, спеціальність 123 «Комп’ютерна інженерія»// Тернопіль, 2021 // с.– 55, рис. – 41 , табл. – 2, аркушів А1 – 4, бібліогр. – 20.
Ключові слова: система, керування, мікроклімат, теплиця, температура, вологість, датчик.
У кваліфікацій роботі бакалавра розроблено комп’ютерну систему керування параметрами мікроклімату теплиці. На основі аналізу предметної області визначено вимоги до системи та побудовано її структурну схему. Окрім цього, для визначення клімату в теплиці та його управлінням створено схему електрично принципову та схему з’єднань на базі мікроконтролера Atmel AT89C51, що відображають основні аспекти роботи системи.
На основі апаратного забезпечення було створено блок-схему алгоритм роботи системи. Засобами Proteus та Fritzing було промодельовано та показано роботу системи.
У роботі обґрунтовано та спроектовано програмне забезпечення комп’ютеризованої системи, враховано вимоги та аспекти до його використання.
Реалізацію програмної складової комп’ютерної системи виконано за допомогою мови програмування Assembly, середовищем програмування обрано AVR Studio.<br>Computer greenhouse climate control system // Bachelor’s thesis // Deket Ruslan Ivanovych // TNTU, speciality 123 «Computer engineering»// Ternopil, 2021 // p.– 55 , fig. – 41 , tab. – 2, posters А1 – 4, ref. – 20.
Keywords: system, control, microclimate, greenhouse, temperature, humidity, sensor.
A computer system for managing the parameters of the greenhouse microclimate has been developed in the bachelor's qualifications. Based on the analysis of the subject area, the requirements for the system are determined and its structural scheme is built. In addition, to determine the climate in the greenhouse and its management, an electrical circuit diagram and a connection diagram based on the Atmel AT89C51 microcontroller were created, which reflect the main aspects of the system operation.
Based on the hardware, a block diagram of the system operation algorithm was created. Proteus and Fritzing modeled and demonstrated the operation of the system.
The software of computerized system is substantiated and designed in the work, requirements and aspects to its use are considered.
The software component of the computer system is implemented using the Assembly programming language, the programming environment is AVR Studio.<br>ВСТУП
РОЗДІЛ 1 АНАЛІЗ ТЕХНІЧНОГО ЗАВДАННЯ
1.1 Вимоги вирощування рослин в теплицях
1.2 Аналіз вимог до комп’ютерної системи
1.3 Огляд існуючих аналогів
1.3.1 Система ОВЕН
1.3.2 Cистема ЕПМ на основі платформи Raspberry Pi
РОЗДІЛ 2 АПАРАТНА ЧАСТИНА
2.1 Розробка структурної схеми комп’ютерної системи
2.2 Обґрунтування вибору апаратного забезпечення
2.2.1 Вибір мікроконтролера
2.2.2 Вибір датчика температури
2.2.3 Вибір датчика вологості
2.2.4 Вибір засобів індикації
2.2.4.1 Вибір семи сегментних індикаторів
2.2.4.2 Вибір світлодіодів
2.2.5 Вибір кнопок управління
2.3 Аналіз електрично-принципової схеми
2.3.1 Схема з’єднання мікроконтролера
2.3.2 Схема з’єднання блоків виконавчих пристроїв
2.3.3 Схема з’єднання датчиків температури та вологості
2.3.4 Схема з’єднань клавіш керування
2.3.5 Схема з'єднання кварцового генератора
2.3.6 Схема з'єднань 7-сегментних індикаторів
2.3.7 Схема з'єднань світлодіодів
2.4 Опис роботи шини даних I2C
РОЗДІЛ 3 ПРОГРАМНА ЧАСТИНА
3.1 Опис алгоритму комп’ютерної системи
3.2 Розробка програмного забезпечення
3.3 Моделювання системи
3.3.1 Опис середовища розробки
3.3.2 Приклади моделювання
3.4 Тестування комп’ютерної системи
ВИСНОВКИ
БІБЛІОГРАФІЯ
Books on the topic "DHTT11 Temperature and humidity sensor"
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K, Anbazhagan, and Ambika Parameswari K. Raspberry Pi - Amazon Alexa Voice Services, Voice Controlled Home Computerization, DS18B20 Temperature Sensor, DHT11 Humidity Sensor, MPU6050 Gyro Sensor, Hall Sensor Etc, . .: New Updated Projects. Independently Published, 2019.
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Brock, Fred V., and Scott J. Richardson. Meteorological Measurement Systems. Oxford University Press, 2001. http://dx.doi.org/10.1093/oso/9780195134513.001.0001.
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This book treats instrumentation used in meteorological surface systems, both on the synoptic scale and the mesoscale, and the instrumentation used in upper air soundings. The text includes material on first- and second-order differential equations as applied to instrument dynamic performance, and required solutions are developed. Sensor physics are emphasized in order to explain how sensors work and to explore the strengths and weaknesses of each design type. The book is organized according to sensor type and function (temperature, humidity, and wind sensors, for example), though several unifying themes are developed for each sensor. Functional diagrams are used to portray sensors as a set of logical functions, and static sensitivity is derived from a sensor's transfer equation, focusing attention on sensor physics and on ways in which particular designs might be improved. Sensor performance specifications are explored, helping to compare various instruments and to tell users what to expect as a reasonable level of performance. Finally, the text examines the critical area of environmental exposure of instruments. In a well-designed, properly installed, and well-maintained meteorological measurement system, exposure problems are usually the largest source of error, making this chapter one of the most useful sections of the book.
Book chapters on the topic "DHTT11 Temperature and humidity sensor"
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Bürgler, T., F. Krogmann, and J. Polak. "Combined Humidity- and Temperature Sensor." In Springer Series on Chemical Sensors and Biosensors. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/5346_2011_7.
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Sai Surya Teja, T., G. Venkata Hari Prasad, I. Meghana, and T. Manikanta. "Publishing Temperature and Humidity Sensor Data to ThingSpeak." In Advanced Technologies and Societal Change. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-4522-9_1.
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Guo, Jun, Mu-Qin Tian, and Mu-Ling Tian. "Design of a Temperature and Humidity Monitoring/Sending System Based on SHT1 Temperature and Humidity Sensor." In Communications in Computer and Information Science. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-24282-3_53.
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Wang, Xi, and Hui Gao. "Agriculture Wireless Temperature and Humidity Sensor Network Based on ZigBee Technology." In Computer and Computing Technologies in Agriculture V. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27281-3_20.
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Xu, Peng, Kai Song, Xiaodong Xia, Yinsheng Chen, Qi Wang, and Guo Wei. "Temperature and Humidity Compensation for MOS Gas Sensor Based on Random Forests." In Communications in Computer and Information Science. Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6373-2_14.
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Barreiro, Pilar, Eva Cristina Correa, and Belén Diezma Iglesias. "Nodes and sensors for multipoint data collection." In Manuali – Scienze Tecnologiche. Firenze University Press, 2020. http://dx.doi.org/10.36253/978-88-5518-044-3.16.
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In this topic the technologies realted to wireless sensor networks (WSN) will be presented. The different parts of the network (nodes, gateway, data transfer protocols...) will be explained, as well as the sensors themselves (sensors for soil humidity, temperature, presure, precipitation, crop physiology, pest detection, etc.)
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Gong, Shuipeng, Changli Zhang, Lili Ma, Junlong Fang, and Shuwen Wang. "Design and Implementation of a Low-Power ZigBee Wireless Temperature Humidity Sensor Network." In Computer and Computing Technologies in Agriculture IV. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-18369-0_74.
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Shun, Wong G., W. Mariam W. Muda, W. Hafiza W. Hassan, and A. Z. Annuar. "Wireless Sensor Network for Temperature and Humidity Monitoring Systems Based on NodeMCU ESP8266." In Communications in Computer and Information Science. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2693-0_19.
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Elkhayat, M., S. Mangiarotti, M. Grassi, P. Malcovati, and A. Fornasari. "Capacitance Humidity Micro-sensor with Temperature Controller and Heater Integrated in CMOS Technology." In Lecture Notes in Electrical Engineering. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55077-0_48.
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Sinde, Ramadhani, Shubi Kaijage, and Karoli Njau. "Reviewing Wireless Sensor Network Model for Forest Temperature and Humidity Monitoring in Usambara Mountains." In Smart Cities/Smart Regions – Technische, wirtschaftliche und gesellschaftliche Innovationen. Springer Fachmedien Wiesbaden, 2019. http://dx.doi.org/10.1007/978-3-658-25210-6_39.
Full textConference papers on the topic "DHTT11 Temperature and humidity sensor"
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Tian, peixuan, Haibo Yang, Zhaoxin Ji, Song Guan, Yuhai Li, and Chunjing He. "Temperature-independent humidity sensor based on FBGs in dual-core optical fiber." In Laser Technology and Applications, edited by Pu Zhou. SPIE, 2024. https://doi.org/10.1117/12.3047771.
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Kow, Jia Xue, Johan Osorio Estevez, Ana Flavia Souza Lima, Yuezhong Xu, and Dong Sam Ha. "Long-Range Low-Power Wireless Sensor to Monitor Temperature and Humidity of Dairy Calves." In 2024 IEEE Biomedical Circuits and Systems Conference (BioCAS). IEEE, 2024. https://doi.org/10.1109/biocas61083.2024.10798102.
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Chernyavsky, A. V., and I. V. Lefanova. "AUTOMATION AND CONTROL SYSTEM FOR CARBON DIOXIDE CONCENTRATION AND HUMIDITY IN A CLOSED ENVIRONMENT." In SAKHAROV READINGS 2021: ENVIRONMENTAL PROBLEMS OF THE XXI CENTURY. International Sakharov Environmental Institute of Belarusian State University, 2021. http://dx.doi.org/10.46646/sakh-2021-2-428-430.
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Creation of an automated carbon dioxide and humidity control system based on theArduino UNO microcontroller, using a relay, real-time ds1307 module and DHT11 temperature and humidity sensor. The control is carried out by means of a program written in the Arduino IDE in the C ++ programming language.
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Pandey, Yash Kumar, Prashant Kumar Patel, Mohit Singh Yadav, Shikha Singh, and Pinki Yadav. "IOT Based Smart Air Purifier." In International Research Conference on IOT, Cloud and Data Science. Trans Tech Publications Ltd, 2023. http://dx.doi.org/10.4028/p-8jq26h.
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With the development in the technologies and modern equipment the level of the pollution has increased significantly. Air pollution caused due to the factories and the automobiles contributes a large share in this pollution and also one of the most challenging because the Particulate matters are released directly in to the air. So, this project is based on solving the global problem of air pollution by designing an air purifier that brings the increased level of air pollution to its lowest level. In this air purifier HEPA filters is used to purify the air and to make it smart sensors and IOTs are used. To make this whole process automatic Arduino based microcontroller (Node MCU ESP12e) is used which makes this whole system self-operating .This model will also use air quality sensor (MQ135 ),temperature sensor (DHT11) and humidity sensor (DHT11) for its working. Along-with this for energy requirements solar panels are used but for future scope electricity generation using piezo-electric plates has also been suggested.
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Ochie, Samuel, and Karen Ochie. "Design and Construction of an Air Quality Monitoring System to Mitigate Virus Spread." In SPE Nigeria Annual International Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/208263-ms.
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Abstract Air pollution is one of the most dangerous problems we face in the world today. It causes many illnesses and diseases that affect the immune system of humans and non-human animals and is also a means of propagating the novel COVID-19 or corona virus. Temperature, humidity, and the level of carbon dioxide characterize the air quality in an environment. In addition to abnormal temperatures and humidity causing direct problems to humans like headaches, heatstroke, hypothermia and hyperthermia, death and so on, it could also cause complicated problems like the acceleration of the growth and lifespan of harmful viruses like the corona virus especially in closed spaces like on a drilling rig or a processing facility. Multiple studies show that the influenza virus, coronavirus, and many others spread from host to host faster in areas with low humidity and high temperatures and upon infection, mortality rate is higher in low humidity regions. Inhalation of toxic levels of carbon dioxide has adverse effects ranging from drowsiness to coma and even death. Despite safety measures put in place in offshore facilities, there are still cases of corona virus outbreaks, hence this study aims to combat the facilitated spread of viruses and enhancement of good air quality via the design and construction of a device that measures the temperature, humidity, and carbon dioxide levels, using a DHT11 and MQ135 sensor. The temperature, humidity and carbon dioxide levels of the living area, bedroom, kitchen, and balcony in a facility was captured by the device to determine the quality of air and characterized. The values were then compared with the expected values from a trusted website to determine the accuracy of the device. The device showed a 99.8% accuracy and passed quality check making it a recommendation to enhance air quality in facilities, houses, or offices.
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Tsyrulnyk, Serhii M., Vasyl M. Tkachuck, and Maksym O. Tsyrulnyk. "Prototyping IOT project at WOKWI service." In 16th IC Measurement and Control in Complex Systems. VNTU, 2022. http://dx.doi.org/10.31649/mccs2022.03.
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In the development strategy of Ukraine Industry 4.0, it is stated that relevant and promising scientific and engineering services are: the creation of new software products, including 4.0 technologies; industrial automation and complex engineering; development and production of complex, low-volume, or unique products. In the conditions of mixed education, which is related to the pandemic and martial law in Ukraine, the question of how to acquire the knowledge and skills necessary for mastering the basics of developing and programming embedded systems that work with the use of smart technologies and Internet of Things technologies is quite relevant. . In the absence of access to ESP8266, ESP32 IoT modules, students are invited to simulate their work in the Wokwi cloud service. The paper considers the temperature and humidity monitoring system in the DWEET.IO cloud service on the ESP8266 IoT module and the DHT11 combined sensor. Prototyping the operation of such a system in the Wokwi service is performed on an ESP32 IoT module and a DHT22 sensor, with the simulation of data transmission to the IoT cloud service. The article provides the source codes of the temperature and humidity monitoring system program. The proposed approach allows for prototyping embedded systems that work using smart technologies and Internet of Things technologies without the presence of IoT modules and sensors. The Wokwi cloud service allows you to configure the software part of embedded systems and connect to real cloud services of the Internet of Things with the simulation of data exchange via a wireless interface using Wi-Fi technology of the 802.11g standard.
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Oprea, Marin. "THE INTEGRATION OF IOT PROJECTS IN UNDERGRADUATE EDUCATION." In eLSE 2019. Carol I National Defence University Publishing House, 2019. http://dx.doi.org/10.12753/2066-026x-19-043.
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The Internet of Things (IoT) is defined by the interconnection between networks of smart devices (objects) through specific communication standards and protocols. Data retrieved from these objects is loaded on cloud servers where it is analyzed, processed and then accessed by users through simple, intuitive, easy-to-use interfaces. The rapid development of IoT applications will steadily increase the demand for skilled personnel in this field. Under these circumstances, the study of IoT basic notions in classrooms becomes a necessity. Using the Arduino and Raspberry Pi development platforms, a wide range of IoT projects can be developed, according to the students' level. These platforms capture environmental data through an extended array of sensors (temperature, light, pressure, humidity, force, acceleration, rotation, sound, IR, magnetic field, etc.), making it perfectly suited to projects development in the educational STEM field (Science, Technology, Engineering and Matemathics). In this study my aim is to show, based on examples, how several IoT projects can be developed in class using the two above mentioned platforms and I emphasize the didactical aspects associated with this study. For the first project I used the Arduino Uno development board, the DHT11 temperature and humidity sensor, and ESP8266 WiFi module, and showed how the ambient temperature and humidity can be monitored via Internet. The data collected by the sensor was processed by Arduino, sent to the WiFi module and further on a cloud server on the IoT ThingSpeak platform where it was stored, analyzed and graphically represented in real time. In the second project I used a Raspberry Pi development board, a mobile robotic platform powered by two electric motors and equipped with a webcam in order to video monitor, via the Internet, a particular perimeter under observation. The robotic platform on which the surveillance camera is located can be positional controlled using a web browser that can access an HTML page built for this purpose. The final part of this study is dedicated to the assessment of the quality of STEM training results by classes of students who have worked on IoT projects compared with classes that have undergone traditional training courses.
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N, Rathika, Elumalai M, Alamelu K, Balachandran S, and Sri Devi G. "Bore Well Rescue System." In International Conference on Modern Trends in Engineering and Management (ICMTEM-24). International Journal of Advanced Trends in Engineering and Management, 2024. http://dx.doi.org/10.59544/tllo4166/icmtem24p11.
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This project proposes an innovative IoT based bore well child rescue system that integrates environmental monitoring and robotic intervention to enhance the efficiency of rescue operations. The system employs various components such as ESP8266, DHT11 sensor, gas sensor, ESP32 camera, servo motor with gripper, and an L298N driver controlling a DC gear motor for front and back rotation. The ESP8266 acts as the central communication hub, enabling real time data exchange between the rescue system and the control center. The DHT11 sensor monitors environmental conditions inside the bore well, providing crucial data on temperature and humidity. The ESP32 camera facilitates live video streaming, offering a comprehensive view of the bore well interior. The servo motor with gripper, controlled by the ESP32, is equipped to handle delicate operations within the confined space of the bore well. To maneuver within the bore well, a robotic system is integrated with a DC gear motor controlled by an L298N driver. This configuration enables precise front and back rotation, allowing the robotic system to navigate through the narrow and complex structure of the bore well. The integration of IoT technologies ensures seamless communication, while the robotic system enhances the precision and effectiveness of the rescue process. Overall, this proposed system deals with the risks associated with bore well rescues, ultimately minimizing response time and increasing the likelihood of successful outcomes.
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Drumea, Andrei, and Paul Svasta. "Wireless sensor for temperature and humidity measurement." In Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies, edited by Paul Schiopu and George Caruntu. SPIE, 2010. http://dx.doi.org/10.1117/12.882390.
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Ngoune, Bernard Bobby, Hamida Hallil, Stephane Bila, et al. "Humidity and Temperature Dual Flexible Microwave Sensor." In 2022 29th IEEE International Conference on Electronics, Circuits and Systems (ICECS). IEEE, 2022. http://dx.doi.org/10.1109/icecs202256217.2022.9971127.
Full textReports on the topic "DHTT11 Temperature and humidity sensor"
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Kyrouac, Jenni, and Adam Theisen. Biases of the MET Temperature and Relative Humidity Sensor (HMP45) Report. Office of Scientific and Technical Information (OSTI), 2017. http://dx.doi.org/10.2172/1366737.
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Clausen, Jay, Susan Frankenstein, Jason Dorvee, et al. Spatial and temporal variance of soil and meteorological properties affecting sensor performance—Phase 2. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41780.
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An approach to increasing sensor performance and detection reliability for buried objects is to better understand which physical processes are dominant under certain environmental conditions. The present effort (Phase 2) builds on our previously published prior effort (Phase 1), which examined methods of determining the probability of detection and false alarm rates using thermal infrared for buried-object detection. The study utilized a 3.05 × 3.05 m test plot in Hanover, New Hampshire. Unlike Phase 1, the current effort involved removing the soil from the test plot area, homogenizing the material, then reapplying it into eight discrete layers along with buried sensors and objects representing targets of inter-est. Each layer was compacted to a uniform density consistent with the background undisturbed density. Homogenization greatly reduced the microscale soil temperature variability, simplifying data analysis. The Phase 2 study spanned May–November 2018. Simultaneous measurements of soil temperature and moisture (as well as air temperature and humidity, cloud cover, and incoming solar radiation) were obtained daily and recorded at 15-minute intervals and coupled with thermal infrared and electro-optical image collection at 5-minute intervals.
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Jengo, Eunice, Salome Maro, and Björn Haßler. Leveraging IOT Systems to Assess and Reduce the Impact of Climate Change in Learning Environments. Open Development & Education, 2025. https://doi.org/10.53832/opendeved.1185.
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Learning environments in low- and middle-income countries are increasingly impacted by climate change, facing challenges such as extreme heat, poor air quality, and noise pollution. However, there is limited research that comprehensively assesses these conditions across diverse climatic zones. This study addresses that gap by designing and piloting a low-cost, energy-efficient, solar-powered IoT system to monitor environmental conditions in schools. Using a mixed-methods, multi-phase research design, the study deploys sensor networks in Tanzanian classrooms—including retrofitted and control spaces—to collect real-time data on temperature, humidity, air quality, and noise levels. Data is transmitted via LoRa to an IoT gateway and then to the cloud using mobile connectivity. The pilot aims to inform decisions on classroom design, scheduling, and retrofitting to mitigate climate-related stress. With plans to scale across other regions and countries, this initiative supports evidence-based interventions for creating more resilient and conducive learning environments in resource-constrained settings.
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Ladd, Neuner, and Olsen. PR-179-13207-R01 Variable Fuel Composition Air Fuel Ratio Control of Lean Burn Engines. Pipeline Research Council International, Inc. (PRCI), 2016. http://dx.doi.org/10.55274/r0010864.
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This research evaluates the effects of variable fuel quality on a large bore 2 stroke natural gas engine by varying ethane in the fuel gas from 5 to 25%. Four control strategies were evaluated at ~2 g/bhp-hr NOx, constant boost control, trapped gas ratio (TGR) control, trapped equivalence ratio (TER) control and a novel NOx sensor feedback control methodology. These control approaches were evaluated during variations in intake manifold temperature, relative humidity, ethane volume percentage, and engine speed. Emissions, combustion parameters, controller performance, and engine performance were measured and compared. During a second phase of testing the impact of fuel quality and other parameters (ignition timing, air manifold temperature, and TER) on detonation was explored at ?15 g/bhp-hr NOx. Techniques to quantify detonation were also evaluated, including a commercial accelerometer based system by Altronic. It was determined that ignition timing was the most effective method to control engine detonation. Fuel composition and TER were shown to have a significant effect on the severity of detonation. It was noted that persistent detonation lead to a steady increase in NOx production, but NOx values alone were inadequate to quantify detonation. At completion of engine testing the operational parameters were analyzed to create predictive models to determine if the engine would begin to detonate based on fuel composition, ignition timing and TER. The generated models accurately predicted the detonation level of the engine. This report has a related webinar.
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Simon, James E., Uri M. Peiper, Gaines Miles, A. Hetzroni, Amos Mizrach, and Denys J. Charles. Electronic Sensing of Fruit Ripeness Based on Volatile Gas Emissions. United States Department of Agriculture, 1994. http://dx.doi.org/10.32747/1994.7568762.bard.
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An electronic sensory system for the evaluation of headspace volatiles was developed to determine fruit ripeness and quality. Two prototype systems were designed, constructed, and later modified. The first is an improved version of our original prototype electronic sniffer using a single head sensing unit for use as a single or paired unit placed on an individual fruit surface for applications in the field, lab, or industry. The second electronic sniffer utilizes a matrix of gas sensors, each selected for differential sensitivity to a range of volatile compounds. This system is more sophisticated as it uses multiple gas sensors, but was found to enhance the ability of the sniffer to classify fruit ripeness and quality relative to a single gas sensor. This second sniffer was designed and constructed for the sampling of fresh-cut or whole packs of fruits such as packaged strawberries and blueberries, and can serve as a prototype for research or commercial applications. Results demonstrate that electronic sensing of fruit ripeness based on aromatic volatile gas emissions can be used successfully with fresh frits. Aroma sensing was successful for classifying ripeness in muskmelons, including different cultivars, apples, blueberries, strawberries, and in a complimentary BARD project on tomatoes. This system compared favorably to the physicochemical measurements traditionally employed to assess fruit maturity. This nondestructive sensory system can detect the presence of physically damaged fruits and shows excellent application for use in quality assessment. Electronic sensors of the tin oxide type were evaluated for specificity toward a wide range of volatiles associated with fruit ripeness. Sensors were identified that detected a broad range of alcohols, aldehydes, esters, hydrocarbons, and volatile sulfur compounds, as well as individual volatiles associated with fruit ripening across a wide concentration range. Sensors are not compound specific, thus, the matrix of sensors coupled with discrimination analysis provides a fingerprint to identify the presence of compounds and to assess alterations in fresh products due to alterations in volatile emissions. Engineering developments led to the development of a system to compensate for temperature and relative humidity relative to on-line aroma sensing with melons for ripeness determination and to reduce response time, thus permitting the electronic sniffer to be used for monitoring both fresh and processed food products. The sniffer provides a fast, reliable and nondestructive tool to assess fruit ripeness and quality. We hope that our work will foster the introduction and utilization of this emerging technology into the agricultural and horticultural