KEYPAD ARDUINO CIRCUIT DIAGRAM

Arduino Keyless Door Lock System with Keypad and LCD
May 09, 2017Circuit Diagram First, connect the 4X4 keypad to the Arduino; connect the first six pins on the 4X4 keypad with the A0 and A5 pins on the Arduino. Then connect the last two pins on the 4X4 keypad module to digital pins 3 and 2 on the Arduino.
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