Arduino Uno R3 - keypad 4x4

Pin connection:

Driver download:

http://robojax.com/learn/arduino/robojax-Keypad.zip

Arduino program:

#include <Keypad.h>

const byte ROWS = 4; //four rows

const byte COLS = 4; //three columns

char keys[ROWS][COLS] = {

  {'1','2','3','A'},

  {'4','5','6','B'},

  {'7','8','9','C'},

  {'*','0','#','D'}

};

byte rowPins[ROWS] = {2, 3, 4, 5}; //connect to the row pinouts of the keypad

byte colPins[COLS] = {6,7,8,9}; //connect to the column pinouts of the keypad

Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

void setup(){

  Serial.begin(9600);

}

  

void loop(){

  char key = keypad.getKey();

    // just print the pressed key

   if (key){

    Serial.println(key);

  } 

  

  // this checkes if 4 is pressed, then do something. Here  we print the text but you can control something.

  if (key =='4'){

    Serial.println("Key 4 is pressed");

  }

}