#define echoPin 2
#define trigPin 15
#define ledRed 4
#define ledYellow 5
#define ledGreen 18

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, OUTPUT);
  pinMode(ledRed, OUTPUT);
  pinMode(ledYellow, OUTPUT);
  pinMode(ledGreen, OUTPUT);
}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  int duration = pulseIn(echoPin, HIGH);
  float distance = duration * 0.034 / 2;

  Serial.print(" = ");
  Serial.println(distance);
  delay(1000);

  if (distance > 150){
    Serial.print("Jarak Jauh");
    digitalWrite(18, HIGH);
    digitalWrite(5, LOW);
    digitalWrite(4, LOW);
  }
  else if (distance < 150 && distance > 75){
    Serial.print("Jarak Sedang");
    digitalWrite(18, LOW);
    digitalWrite(5, HIGH);
    digitalWrite(4, LOW);
  } 
  if (distance < 75){
    Serial.print( "Jarak dekat" );
    digitalWrite(18, LOW);
    digitalWrite(5, LOW);
    digitalWrite(4, HIGH);
  }
  else {}
  }