int pinled = 4;
int pininput = 0;
int periksa = 0;

void setup() {
  pinMode(pinled, OUTPUT);
  pinMode(pininput, INPUT);
}

void loop() {
  periksa = digitalRead(pininput);
  if(periksa == HIGH){
    digitalWrite(pinled, HIGH);
    delay(100);
  }else{
    digitalWrite(pinled, LOW);
    delay(100);
  }
}