int ir = 1;
#define led 13

void setup() {
  // put your setup code here, to run once:
  pinMode(ir, INPUT);
  pinMode(led, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  int nilai = digitalRead(ir);

  if (nilai == 0) {
    digitalWrite(led, HIGH);
    }
    else {
      digitalWrite(led, LOW);
    }
}