#define ECHO_PIN 2
#define TRIG_PIN 15
#define merah 19
#define ungu 18
#define hijau 5

void setup() {
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(merah, OUTPUT);
  pinMode(ungu, OUTPUT);
  pinMode(hijau, OUTPUT);
}

float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
}

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

  Serial.print("Jarak: ");
  Serial.print(distance);
  Serial.println("cm");

  delay(100);
  if(distance >= 50.00){
    digitalWrite(hijau, HIGH);
  }
  if(distance >= 100.00){
    digitalWrite(ungu, HIGH);
  }
  if(distance >= 200.00){
    digitalWrite(merah, HIGH);
  }
  if(distance <= 50.00){
    digitalWrite(hijau, LOW);
  }
  if(distance <= 100.00){
    digitalWrite(ungu, LOW);
  }
  else if(distance <= 200.00){
    digitalWrite(merah, LOW);
  }
  
}