//I Kadek Yogi Kurniawan
//19102125

#define ECHO_PIN 2
#define TRIG_PIN 15
#define buzzer 4

int led1 = 21;
int led2 = 19;
int led3 = 18;
int led4 = 5;
int sound = 250;

//long durasi;
//int jarak;

void setup() {
  Serial.begin(9600);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(buzzer, 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;

  if(distance > 50 && distance < 100){
    Serial.println("Jarak lebih dari 50cm");
    digitalWrite(led1, HIGH);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
    digitalWrite(led4, LOW);
    noTone(buzzer);
  }
  else if(distance > 100 && distance < 200){
    Serial.println("Jarak lebih dari 100cm");
    digitalWrite(led1, HIGH);
    digitalWrite(led2, HIGH);
    digitalWrite(led3, LOW);
    digitalWrite(led4, LOW);
    noTone(buzzer);
  }
  else if(distance > 200 && distance < 300){
    Serial.println("Jarak lebih dari 200cm");
    digitalWrite(led1, HIGH);
    digitalWrite(led2, HIGH);
    digitalWrite(led3, HIGH);
    digitalWrite(led4, LOW);
    digitalWrite(buzzer, LOW);
    noTone(buzzer);
  }
  else if(distance > 300){
    Serial.println("Jarak lebih dari 300cm");
    digitalWrite(led1, HIGH);
    digitalWrite(led2, HIGH);
    digitalWrite(led3, HIGH);
    digitalWrite(led4, HIGH);
    tone(buzzer, sound);
  }
  else if(distance < 50){
    Serial.println("Jarak kurang dari 50cm");
    digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
    digitalWrite(led4, LOW);
    noTone(buzzer);
}
}