manejo de teclado 4x4 matricial con arduino | arduino desde cero @Edi...

#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] = {9, 8, 7, 6}; //connect to the row pinouts of the keypad

byte colPins[COLS] = {5, 4, 3, 2}; //connect to the column pinouts of the keypad

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

void setup(){

  Serial.begin(9600);

  pinMode(13,OUTPUT);

}

 

void loop(){

  char key = keypad.getKey();

 

  if (key){

    Serial.println(key);

    if(key == '1')

    {

      digitalWrite(13,HIGH);

    }

    if(key == '2')

    {

      digitalWrite(13,LOW);

    }

  }

}