KEYPAD WITHLIBRARY TINKER CAD

 

                         #include <Keypad.h>

const byte ROWS = 4; //four rows

const byte COLS = 4; //four columns

char keys[ROWS][COLS] = {

  {'1','2','3','A'},

  {'4','5','6','B'},

  {'7','8','9','C'},

  {'*','0','#','D'}

};

byte rowPins[ROWS] = {13, 12, 11, 10}; //connect to the row pinouts of the keypad

byte colPins[COLS] = {7, 6, 5, 4}; //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();

    if (key){

    Serial.println(key);

      }

}