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Journal articles on the topic '*4 keypad lock'

Author: Grafiati

Published: 7 June 2025

Last updated: 2 August 2025

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1

Li, Menglu, Zifei Wang, Jiying Liang, et al. "A chemical/molecular 4-input/2-output keypad lock with easy resettability based on red-emission carbon dots–Prussian blue composite film electrodes." Nanoscale 10, no. 16 (2018): 7484–93. http://dx.doi.org/10.1039/c8nr01258j.

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2

Li, Qian, Zhenzhong Wang, Jian Xu, Ying Yue, and Shijun Shao. "Recognition and sensing of AcO− and F− using a calix[4]pyrrole-derived hydrazone: a potential molecular keypad lock." RSC Adv. 4, no. 65 (2014): 34470–73. http://dx.doi.org/10.1039/c4ra05499g.

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Calix[4]pyrroles based colorimetric anion receptor 2 could recognize F<sup>−</sup> and AcO<sup>−</sup> anions in DMSO solvent. This type of sensing behaviour could mimic a molecular level keypad lock stimulated by the two sequential chemical inputs (AcO<sup>−</sup> and F<sup>−</sup>), which has the potential for application in security devices.

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3

Arrizal, Ahmad Aziz, Sri Wahyu Suciyati, Arif Surtono, and Gurum Ahmad Pauzi. "Design and Build Entry Access Restriction System Laboratory Using Radio Frequency Identification (RFID) and Keypad Technology." Journal of Energy, Material, and Instrumentation Technology 3, no. 2 (2022): 57–62. http://dx.doi.org/10.23960/jemit.v3i2.101.

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The laboratory access restriction system has been realized using RFID and keypad technology, based on an Arduino microcontroller as a processor. The system has recorded users who entered the room by identifying the RFID tag (transponder) used to open the door from the outside. As for access outside the room, the user only needs to enter the password as identification data on the keypad, and the system would reduce the number of room users and open the door. The output of this system was a solenoid lock which functions as an electronic lock and an LCD to display the status of the RFID reading.

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4

Kumar, Manoj, Abhimanew Dhir, and Vandana Bhalla. "A Molecular Keypad Lock Based on the Thiacalix[4]arene of 1,3-AlternateConformation." Organic Letters 11, no. 12 (2009): 2567–70. http://dx.doi.org/10.1021/ol900845g.

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5

Wibowo, Kunto, Bambang Harianto, and Moohammad Karjadi. "Designing Digital Combination Keys on Safes." Indonesian Journal of Multidisciplinary Science 2, no. 3 (2022): 2044–55. http://dx.doi.org/10.55324/ijoms.v2i3.300.

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A digital combination lock is a key that works electronically and only people who know the code can open it and close it. By doing several combinations consisting of 4 digits, namely by pressing the numbers 0 to 9 on the keypad keys. The digital combination lock on the safe consists of a krndali encoder, decoder, comperator, timer and shif register, also consists of a dc motor that serves to open and pop the safe door. The results of the trials that the safe door conducted when closing and opening it can be set using a potentiote with a lap time of between 1 to 5 seconds.

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6

Valupi, Christine, Tamsir Ariyadi, Nina Paramyta, and Timur Dali Purwanto. "Prototipe Sistem Smart Box untuk Keamanan Penerimaan Paket Online Shopping." Jurnal Ilmiah Universitas Batanghari Jambi 25, no. 1 (2025): 964. https://doi.org/10.33087/jiubj.v25i1.5675.

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This research aims to design a tool with a smart box system that is used by package owners to be able to automatically receive packages and temporarily store packages safely. This tool uses an ESP-32Wroom microcontroller which will process input from the HC-SR04 ultrasonic sensor, HX-711 loadcell and Keypad. The courier can only open the box by inputting the code on the 4 x 4 keypad on the box. When the receipt is successfully entered, the door lock solenoid on the box will be ON and the box will open and the package will be stored in the box. After the package is put into the box by the couri

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7

Wei, Tai-Bao, Wen-Ting Li, Qiao Li, et al. "A dual-channel chemosensor could successively detect CN− and HSO4− in an aqueous solution and act as a keypad lock." RSC Advances 6, no. 49 (2016): 43832–37. http://dx.doi.org/10.1039/c6ra06769g.

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A dual-channel sensor (T) based on a phenazine derivative has been designed and synthesized. The sensor T could successively detect CN<sup>−</sup> and HSO<sub>4</sub><sup>−</sup> in aqueous solution with high selectivity and sensitivity.

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8

Singh, Prabhpreet, Harminder Singh, Gaurav Bhargava, and Subodh Kumar. "‘To kill many birds with one stone’: Addressing half-adder, half-subtractor, demultiplexer, 2-to-4 decoder, comparator, keypad lock with unimolecular system." Sensors and Actuators B: Chemical 245 (June 2017): 1004–14. http://dx.doi.org/10.1016/j.snb.2017.01.204.

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9

Remón, Patricia, Martin Hammarson, Shiming Li, Axel Kahnt, Uwe Pischel, and Joakim Andréasson. "Molecular Implementation of Sequential and Reversible Logic Through Photochromic Energy Transfer Switching." Chem. Eur. J. 17, no. 23 (2011): 6492–500. https://doi.org/10.1002/chem.201100027.

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Photochromic spiropyrans modified with fluorophores were investigated as molecular platforms for the achievement of fluorescence switching through modulation of energy transfer. The dyads were designed in such a way that energy transfer is only observed for the open forms of the photochrome (merocyanine and protonated merocyanine), whereas the closed spiropyran is inactive as an energy acceptor. This was made possible through a deliberate choice of fluorophores (4-amino-1,8-naphthalimide, dansyl, and perylene) that produce zero spectral overlap with the spiro form and considerable overlap for

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10

Remón, Patricia, Martin Hammarson, Li Shiming, Axel Kahnt, Uwe Pischel, and Joakim Andréasson. "Molecular Implementation of Sequential and Reversible Logic Through Photochromic Energy Transfer Switching." Chem. Eur. J. 17, no. 23 (2011): 6492–500. https://doi.org/10.5281/zenodo.10648138.

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Photochromic spiropyrans modified with fluorophores were investigated as molecular platforms for the achievement of fluorescence switching through modulation of energy transfer. The dyads were designed in such a way that energy transfer is only observed for the open forms of the photochrome (merocyanine and protonated merocyanine), whereas the closed spiropyran is inactive as an energy acceptor. This was made possible through a deliberate choice of fluorophores (4-amino-1,8-naphthalimide, dansyl, and perylene) that produce zero spectral overlap with the spiro form and considerable overlap for

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11

Marhoon, Hamzah M., Ali Ihsan Alanssari, and Noorulden Basil. "Design and Implementation of an Intelligent Safety and Security System for Vehicles Based on GSM Communication and IoT Network for Real-Time Tracking." Journal of Robotics and Control (JRC) 4, no. 5 (2023): 708–18. http://dx.doi.org/10.18196/jrc.v4i5.19652.

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In recent years, the surge in car theft cases, often linked to illicit activities, has become a growing concern. Simultaneously, countries grappling with oil shortages have shifted towards converting vehicles to run on liquid propane gas, presenting new safety challenges for car owners. This paper introduces a novel integrated intelligent system designed to address the challenges of car theft and safety concerns associated with gas-based vehicles. By seamlessly integrating these concerns into a single system, it aims to achieve significantly improved performance compared to traditional alarm s

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12

Mousty, Paul, Jean-Paul Morvan, and André Grimaud. "Automatic Warning Stations, Recent Serious Industrial River Pollution Incidents, and Prediction Models of Pollutants Propagation–Some European Examples." Water Science and Technology 22, no. 5 (1990): 259–64. http://dx.doi.org/10.2166/wst.1990.0038.

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The automatic analysing station located just downstream of the Basel urban area at Huningue, consists of an alarm station linking the automatic detection of certain important pollution parameters (T.O.C., hydrocarbons, heavy metals, pesticides, etc.). and the resulting alarms, to a working mathematical model of pollutant plume propagation, operating on the river between Basel and Strasbourg. This model is keyed to the real flow conditions of the Rhine, determined by life-size tracing operations (using coloured Rhodamine marker). A decisive factor in speeding up the transmission of alarm signal

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13

Ardiyansyah, Arief, Eko Setiawan, and Bahroin Budiya. "Moving Home Learning Program (MHLP) as an Adaptive Learning Strategy in Emergency Remote Teaching during the Covid-19 Pandemic." JPUD - Jurnal Pendidikan Usia Dini 15, no. 1 (2021): 1–21. http://dx.doi.org/10.21009/jpud.151.01.

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The Covid-19 pandemic had a dangerous impact on early-childhood education, lost learning in almost all aspects of child development. The house-to-house learning, with the name Moving Home Learning Program (MHLP), is an attractive offer as an emergency remote teaching solution. This study aims to describe the application of MHLP designed by early-childhood education institutions during the learning process at home. This study used a qualitative approach with data collection using interviews, observation, and documentation. The respondents involved in the interview were a kindergarten principal

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14

Shalbin, Benny, Sudheer P. M. Saurav, Sahal A. A. Muhammed, Badhar Minsha, and V. C. Aasha. "Password Based Smart Door Lock System for Enhanced Security." May 22, 2025. https://doi.org/10.5281/zenodo.15487402.

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In this progressively insecure world today, there is indeed no going back into using old-fashioned keys and locks. That is because keys can get lost, stolen, or even duplicated and leave homes or offices vulnerable. This is why this project aims at building a Smart Doorlock System that uses a password instead of a key, simple and added security. In fact, this entire system would be powered by a small yet very sturdy microcontroller known as the ESP8266. It can do the locking process alone, and it is also base to future online access system. For example, in this manner, to unlock the door, the

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15

Benny, Benny, Muhammad Abiyyu Rama, and Nurul Rahma Dinda. "KUNCI PENGAMAN BRANKAS MENGGUNAKAN PIN DAN RFID." Jurnal Poli-Teknologi 15, no. 2 (2016). http://dx.doi.org/10.32722/pt.v15i2.812.

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ABSTRACT Making the control device safety lock pin and the safe use of RFID is aiming to create a safe security lock control device that can control the safety lock is easy, efficient, practical in use in order to improve comfort and security in controlling the security key. This tool will work after a pin code which is pressed by the user is correct, or RFID tags are used properly. The method used in the manufacturing of control devices using the safety lock pin and RFID is a prototype. These methods consist of several stages: (1) Identification of Needs, (2) Needs Analysis, (3) Design Hardwa

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16

Islam, Muhammad, Zahid Shafiq, Fazal Mabood, et al. "2-Nitro- and 4-fluorocinnamaldehyde based receptors as naked-eye chemosensors to potential molecular keypad lock." Scientific Reports 11, no. 1 (2021). http://dx.doi.org/10.1038/s41598-021-99599-w.

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AbstractNew-generation chemosensors desire small organic molecules that are easy to synthesise and cost-effective. As a new interdisciplinary area of research, the integration of these chemosensors into keypad locks or other advanced communication protocols is becoming increasingly popular. Our lab has developed new chemosensor probes that contain 2-nitro- (1–3) and 4-fluoro-cinnamaldehyde (4–6) and applied them to the anion recognition and sensing process. Probes 1–6 are colorimetric sensors for naked-eye detection of AcO−/CN−/F−, while probes 4–6 could differentiate between F− and AcO−/CN− a

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17

Singh, Vaishali, Shubhra Kala, Tanmay Rom, Avijit Paul, and Rampal Pandey. "A Multi-cation Responsive Ni(II)-Supramolecular Metallogel Mimics as Molecular Keypad Lock via Reversible Fluorescence Switching." Dalton Transactions, 2023. http://dx.doi.org/10.1039/d2dt03714a.

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Synthesis of a bidentate N,O-donor Schiff base fluorescent ligand 5-(diethylamino-2-((4-(diethylamino-2-((4-(diethylamino)phenylimino)ethyl)phenol) (HL) adopting new preparation procedure and its complexes with Ni(II) (1) and Zn(II) (2), has been illustrated. Structures of HL...

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18

"Iot Based Security System for bank Vaults." 4 2, no. 4 (2022): 95–98. http://dx.doi.org/10.46632/daai/2/4/17.

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The main objective of our paper is to design and implement a bank vault security system based on IOT technology. The proposed system is designed which implements a security system to handle the cash lockers by the authorized person. It is developed using Arduino Microcontroller which is interfaced to the RFID reader to read the code, keypad module for password authentication and camera module for face recognition. If unauthorized person tries to break or open the lock, it is automatically monitored and detected using embedded and IOT technology. After detection, GSM and IOT module is used to s

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19

Rohokale, Sujit, Pravin Gawande -, Shreyas Kale -, Sumant Umardand -, and Himanshu Sali -. "Design and Development of a Password-Based Door Lock System Using Microcontroller and Electromechanical Solenoid." International Journal For Multidisciplinary Research 7, no. 3 (2025). https://doi.org/10.36948/ijfmr.2025.v07i03.44813.

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This paper presents the design and implementation of a low-cost, reliable electronic door locking system driven by an 8052 microcontroller and secured through password-based authentication. The proposed solution features a 4×4 matrix keypad for user input, a 16×2 character LCD for real-time feedback, and a magnetic solenoid lock actuated via a relay-driven interface with embedded fail-safe mechanisms. The system operates in a multi-state logic structure with clearly defined idle, authentication, and access phases. Extensive validation confirms a 99.2% success rate across 1,000 authentication t

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20

Lian, Wenjing, Chengxing Cui, Junyi Lin, Menghan Wang, and Hongyun Liu. "A Resettable and Reprogrammable 3‐Input/3‐Output Biomolecular Keypad Lock Based on Stimulus‐Responsive Enzymatically Imprinted Polymer Film Electrodes." Advanced Sustainable Systems, January 5, 2025. https://doi.org/10.1002/adsu.202400854.

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AbstractA complex biomolecular logic system based on stimulus‐responsive enzymatically imprinted polymer is constructed for the first time. Glucose oxidase (GOD) is served as the template to construct the molecularly imprinted polymer (MIP) with N‐isopropylacrylamide (NiPAAm) as the thermo‐sensitive monomer. The prepared MIP film electrodes demonstrate reversible GOD‐, temperature‐, and glucose‐sensitive on‐off electrochemiluminescence (ECL) behaviors toward luminol. Moreover, the addition of ferrocenedicarboxylic acid (Fc(COOH)2) into the luminol solution can enhance the ECL signal of the sys

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21

Misra, Arvind, Ravisen Rai, Mohammed Kaleem, and Rimpi Bhandari. "An Anthracene‐imidazoanthraquinone Conjugate Exhibiting Ratiometric Fluorescence Turn – On Behavior with CN‐ and F‐ Anions." ChemPlusChem, January 8, 2025. https://doi.org/10.1002/cplu.202400660.

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A new conjugate, 2‐(4‐(anthracen‐9‐yl) phenyl)‐[1,2‐d]imidazole‐1H‐anthraquninone (AQI) has been designed and synthesized as a molecular probe 4. The photophysical and electrochemical behavior of the probe in the absence and presence of different class of ions were examined in acetonitrile solution. The probe 4 with F‐ and CN‐ anions showed ratiometric fluorescence “turn – On” response due to variation in ICT processes. Cyclic voltammetry of probe exhibited reversible redox behavior wherein the band gap (Eg = 1240/lmax) of probe (DE = 3.220 eV) decreased (~ 2.583 eV) after the interaction with

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22

Moalemian, Mehdi, Hossein Tavallali, Fereydoon Khazali, and Mina Hosseini. "An ultrasensitive chemosensor based on Pb(II) complex of a xanthene ligand as an easily commercially available dye for the detection of cysteine in biological samples." Journal of the Chinese Chemical Society, January 29, 2025. https://doi.org/10.1002/jccs.202400291.

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AbstractIn this study, an ultra‐sensitive colorimetric chemosensor was designed and built for the identification and determination of Pb2+ and cysteine (Cys) by optical color variation based on indicator displacement evaluation (IDA) using xanthine, bromopyrogallol red (BPR) dye. Label exchange between BPR and Cys occurred when Cys was added to the lead(II) complex (BPR), resulting in a clear and immediate color variation from red to purple in a DMSO/MES buffer (10.0 mmol/L, pH 5.5 (1:4 v/v)). The suggested method shows a detection limit of 5.0 nmol/L and a good linear range of 0.04–4.71 μmol/

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23

Tavallali, Hossein, Abolfath Parhami, Maryam Sadat Salami, and Mohammad Ali Karimi. "A simple, sensitive, and selective colorimetric chemosensor for sequential determination of dual analytes, Ce³⁺, H₂PO₄⁻, and its applications in the logic gate construction and the system of keypad lock." Journal of the Chinese Chemical Society, April 6, 2024. http://dx.doi.org/10.1002/jccs.202300391.

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AbstractSodium (E)‐3‐hydroxy‐4‐((2‐hydroxynaphthalen‐1‐yl)diazenyl)naphthalene‐1‐sulfonate (Calcon, CAL), is employed for the first time as a reversible colorimetric chemosensor to detect and measure Ce3+ and H2PO4− sequentially in the aqueous medium. The detection process has two steps. The interaction of CAL and Ce3+ in the first step with a noticeable color shift from purple to blue. Further, the reaction between CAL‐Ce3+ and H2PO4− shows a clear color return from blue back to initial purple similar to that for CAL. The UV–visible examination of this color return reveals that H2PO4− removes

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24

Mandi, Ashok, Nandagopal Bar, Arindam Ray, et al. "Synthesis of a Photochromic Schiff Base Metal Complex for the Spectroscopic, Thermodynamic, and Computational Studies." ChemistrySelect 10, no. 26 (2025). https://doi.org/10.1002/slct.202502179.

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AbstractPhotostimuli‐responsive Schiff base metal complexes have various applications, such as cosmetics products, electronics devices, optical memory, UV‐strength sensors, molecular logic gates, molecular keypad locks, photo printing, etc. In this article, we have designed and synthesized a rhodamine‐based Schiff base metal complex (Zn‐rhodamine 6G hydrazide‐2‐hydroxy‐4‐methoxybenzaldehyde) to demonstrate fantastic photochromic properties. NMR, FT‐IR, ESI‐mass, UV–vis, XPS, fluorescence, and computational (DFT) data confirm the structure of the Schiff base ligand and its Zn complex. The absor

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25

Asane, Satish, Sushilkumar Salve, Athrav Potdar, Abhishek Wagh, and Mukesh Nilwarn. "Security System Using Face Recognition: Machine Learning Based Approach." Journal of Information and Communications Technology: Algorithms, Systems and Applications 1, no. 1 (2025). https://doi.org/10.64189/ict.25304.

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The rising occurrences of illegal entry and security breaches have made guaranteeing safety inside residential societies a key worry in the contemporary day. Often lacking in consistent and tamper-proof access control are traditional security solutions like manual guarding, RFID cards, or keypad locks. These traditional approaches are vulnerable to human error, duplication, and illegal use, hence stressing the critical need for a more smart and automated solution. Recent studies in the area of machine learning and computer vision have produced encouraging findings in facial recognition technol

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26

Kumar, Ashish, Yogesh Dashrath Naik, Vedant Gautam, et al. "Genome‐wide association mapping reveals novel genes and genomic regions controlling root‐lesion nematode resistance in chickpea mini core collection." Plant Genome, September 13, 2024. http://dx.doi.org/10.1002/tpg2.20508.

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AbstractRoot‐lesion nematodes (RLN) pose a significant threat to chickpea (Cicer arietinum L.) by damaging the root system and causing up to 25% economic losses due to reduced yield. Worldwide commercially grown chickpea varieties lack significant genetic resistance to RLN, necessitating the identification of genetic variants contributing to natural resistance. This study identifies genomic loci responsible for resistance to the RLN, Pratylenchus thornei Sher & Allen, in chickpea by utilizing high‐quality single nucleotide polymorphisms from whole‐genome sequencing data of 202 chickpea acc

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