#define PIN_TRIG 3
#define PIN_ECHO 2
#define merah 13
#define biru 12

void setup() {
 
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
  pinMode(merah, OUTPUT);
  pinMode(biru, OUTPUT);
}
float ultrasonik(){
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);
  int durasiPantulan = pulseIn(PIN_ECHO, HIGH);
  return durasiPantulan * 0.034 / 2;
}
void loop() {
  float jarak = ultrasonik();
  if(jarak>150){ 
    digitalWrite(merah, HIGH);
    digitalWrite(biru, LOW);
  }
  else if(jarak<=150){ 
    digitalWrite(merah, LOW);
    digitalWrite(biru, HIGH);
  }
  
}