#include <Keypad.h>
const byte ROWS=4;
const byte COLS=4;
char hexaKeys[ROWS][COLS]={
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}};
byte rowpin[ROWS]={9,8,7,6};
byte colpin[COLS]={5,4,3,2};
Keypad coustomKeypad=Keypad(makeKeymap(hexaKeys),rowpin,colpin,ROWS,COLS);
char coustomKey;
int led=13;
void setup() {
  Serial.begin(9600);
  pinMode(led, OUTPUT);
}
void loop() {
  coustomKey=coustomKeypad.getKey();
  if(coustomKey!=NO_KEY)
  {
    Serial.println(coustomKey);
    switch(coustomKey){
      case'1':
      digitalWrite(led, HIGH);
      break;
      case'2':
      digitalWrite(led, LOW);
      break;
      default:;
    }
  }
    }