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![The keypad circuit diagram | Download Scientific Diagram](https://i2.wp.com/www.researchgate.net/profile/Adedeji-Michael/publication/317305160/figure/fig2/AS:500760507289606@1496402016945/The-keypad-circuit-diagram.png)
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![Digital Keypad Security Door Lock using Arduino](https://i2.wp.com/circuitdigest.com/sites/default/files/circuitdiagram_mic/Keypad-Door-Lock-Circuit-Diagram.jpg)
![How to interface keypad with 8051 microcontroller (AT89C51)- (Part 13/45)](https://i2.wp.com/www.engineersgarage.com/wp-content/uploads/2019/10/Circuit-Diagram-of-How-to-interface-keypad-with-8051-microcontroller-AT89C51.gif)
![Future Dreams](https://4.bp.blogspot.com/-PZv9D7Ab32Q/VAYaqMgB1XI/AAAAAAAAAXw/KeUzQ2H5E2c/s1600/Keypad%2BLock%2BCircuit%2BDiagram.jpg)
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![4x4 Keypad Interfacing with AVR Microcontroller (ATmega32)](https://i2.wp.com/circuitdigest.com/sites/default/files/circuitdiagram_mic/ATmega32-Keypad-Circuit.gif)
![Keypad Encoder IC with Serial Output Schematic Circuit Diagram](https://i2.wp.com/circuit-diagramz.com/wp-content/uploads/2018/08/Keypad-Encoder-IC-with-Serial-Output-Schematic-Circuit-Diagram.jpg)
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![Keypad Interfacing with 8051 Microcontroller (AT89S52)](https://i2.wp.com/circuitdigest.com/sites/default/files/circuitdiagram_mic/8051-Keypad-Interfacing.gif)