const int ButtonPinX = 4;
const int ButtonPinY = 2;
const int LedPin = 15;
int ButtonState1 = 0, ButtonState2;
void setup() {
Serial.begin(9600);
pinMode(ButtonPinX, INPUT_PULLUP); // pin 2 jadi high =5v
pinMode(ButtonPinX, INPUT_PULLUP); // pin 2 jadi high =5v
pinMode(LedPin, OUTPUT);
}

void loop() {
ButtonState1 = digitalRead (ButtonPinX);
ButtonState2 = digitalRead(ButtonPinY);

if ( (ButtonState1 == 0) && (ButtonState2 == 0))
{
digitalWrite(LedPin, HIGH); // Led ON
Serial.println("LED ON");
delay(100); // 100 ms

} 
if ( (ButtonState1 == 1) && (ButtonState2 == 1) )
{
digitalWrite (LedPin, LOW); // led off
Serial.println("LED OFF");
delay(100);

}

}