#include <Keypad.h>
byte l1 = 10;
byte l2 = 11;
byte l3 = 12;
byte l4 = 13;
const byte r = 4;
const byte c = 4;
char keys [r] [c] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'},
};
byte cp[c] = {5, 4, 3, 2}; //connect ke C1,C2,C3,C4 (bagian kanan) 
byte rp[r] = {9, 8, 7, 6}; //connect ke R1,R2,R3,R4 (bagian kiri)
Keypad keypad = Keypad(makeKeymap(keys), rp, cp, r, c);

void setup() {
  Serial.begin(9600);
  pinMode(l1, OUTPUT);
}

void loop() {
  char key = keypad.getKey();
  if (key != NO_KEY) {
    Serial.println(key);
  }

  if(key == '5'){
    for(int i=1;i<=9999999999999999999999999999;i++)
    {
    digitalWrite(l1, HIGH);
    delay(500);
    digitalWrite(l1, LOW);
        digitalWrite(l2, HIGH);
    delay(500);
    digitalWrite(l2, LOW);
        digitalWrite(l3, HIGH);
    delay(500);
    digitalWrite(l3, LOW);
        digitalWrite(l4, HIGH);
    delay(500);
    digitalWrite(l4, LOW);
    }
  };
  switch(key) {
    case '1' :
    digitalWrite(l1, HIGH);
    delay(1000);
    digitalWrite(l1, LOW);
    break;
    case '2' :
    digitalWrite(l2, HIGH);
    delay(1000);
    digitalWrite(l2, LOW);
    break;
    case '3' :
    digitalWrite(l3, HIGH);
    delay(1000);
    digitalWrite(l3, LOW);
    break;
    case '4' :
    digitalWrite(l4, HIGH);
    digitalWrite(l1, HIGH);
    digitalWrite(l2, HIGH);
    digitalWrite(l3, HIGH);
    delay(1000);
    digitalWrite(l4, LOW);
    digitalWrite(l1, LOW);
    digitalWrite(l2, LOW);
    digitalWrite(l3, LOW);
    break;
    case '0' :
    digitalWrite(l1, LOW);
    digitalWrite(l2, LOW);
    digitalWrite(l3, LOW);
    digitalWrite(l4, LOW);
    break;

    case '6' :
    digitalWrite(l1, HIGH);
    delay(6000);
    digitalWrite(l1, LOW);
    break;
    case '7' :
    digitalWrite(l1, HIGH);
    delay(7000);
    digitalWrite(l1, LOW);
    break;
    case '8':
    digitalWrite(l1, HIGH);
    delay(8000);
    digitalWrite(l1, LOW);
    break;
    case '9' :
    digitalWrite(l1, HIGH);
    delay(9000);
    digitalWrite(l1, LOW);
    break;

  }
}