#include <Keypad.h>

const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

uint8_t colPins[COLS] = { 5, 4, 3, 2 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 9, 8, 7, 6 }; // Pins connected to R1, R2, R3, R4
const int led=10;
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

void setup() {
  Serial.begin(9600);
  pinMode(led, OUTPUT);
}

void loop() {
  char key = keypad.getKey();
  switch(key){
    case'1':
      kedip(1);
      break;
    case'2':
      kedip(2);
      break;
    case'3':
      kedip(3);
      break;
    default:
      break;
  }
}

void kedip(int jumlah){
  for(int i=1; i<=jumlah; i++){
    digitalWrite(led, HIGH);
    delay(250);
    digitalWrite(led, LOW);
    delay(250);
  }
}