Circuit Diagram for Arduino Keypad Door Lock. The Complete circuit diagram for our Arduino based Digital Keypad Door Lock project is shown below. First of all, we start from the brain of this project ...

Circuit Diagram of Interfacing Membrane Keypad with Arduino Uno. Connection of Arduino with 4x4 keypad is quite simple. Connect the 4 columns of the keypad to digital pins 4, 5, 6, and 7 on the ...

Arduino Uno; 4x4 keypad; 16*2 LCD; DC Lock; Relay; 9V battery; 10k potentiometer; 220-ohm resistor; Circuit Diagram. First, connect the 4X4 keypad to the Arduino; connect the first six pins on the 4X4 ...