#define TRIG 15
#define ECHO 2
#define LD1 19
#define LD2 18
#define LD3 5
#define BUZ 16

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  //Serial.println("Hello, ESP32!");
  pinMode(TRIG, OUTPUT);
  pinMode(LD1, OUTPUT);
  pinMode(LD2, OUTPUT);
  pinMode(LD3, OUTPUT);
  pinMode(ECHO, INPUT);
  pinMode(BUZ, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  //delay(10); // this speeds up the simulation

  digitalWrite(TRIG, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG, LOW);
  int duration = pulseIn(ECHO, HIGH);
  float distance = duration * 0.034 / 2;

  if (distance > 50.00) {digitalWrite(LD1, HIGH);
    tone(BUZ, 0); 
  }
  if (distance > 100.00) {digitalWrite(LD2, HIGH);
    tone(BUZ, 0); 
  }
  if (distance > 200.00) {digitalWrite(LD3, HIGH);
    tone(BUZ, 0); 
  }
  if (distance > 300.00) {
    Buzzer(LD1);
    Buzzer(LD2);
    Buzzer(LD3);
    tone(BUZ, 333); 
  }
  else{
    digitalWrite(LD1, LOW);
    digitalWrite(LD2, LOW);
    digitalWrite(LD3, LOW);
  }

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

  delay(100);

}

void Buzzer(int x){
  digitalWrite(x, HIGH);
  delay(10);
  digitalWrite(x, LOW);
}