// Nama: Michael Natanael
// NIM: 2107411002

#define ECHO_PIN 12
#define TRIG_PIN 13

int blueLedPin = 19; // Pin LED biru
int redLedPin = 18; // Pin LED merah
int yellowLedPin = 5; // Pin LED kuning
int greenLedPin = 17; // Pin LED hijau

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  // Serial.println("Hello, ESP32!");
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  pinMode(blueLedPin, OUTPUT);
  pinMode(redLedPin, OUTPUT);
  pinMode(yellowLedPin, OUTPUT);
  pinMode(greenLedPin, 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() {
  // put your main code here, to run repeatedly:
  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.println(distance);

  if (distance > 50) {
    digitalWrite(blueLedPin, HIGH);
    digitalWrite(redLedPin, LOW);
    digitalWrite(yellowLedPin, LOW);
    digitalWrite(greenLedPin, LOW);
  } else {
    Serial.println("OFF!");
    digitalWrite(blueLedPin, LOW);
    digitalWrite(redLedPin, LOW);
    digitalWrite(yellowLedPin, LOW);
    digitalWrite(greenLedPin, LOW);
  }

  if (distance > 100) {
    digitalWrite(blueLedPin, HIGH);
    digitalWrite(redLedPin, HIGH);
    digitalWrite(yellowLedPin, LOW);
    digitalWrite(greenLedPin, LOW);
  }

  if (distance > 200) {
    digitalWrite(blueLedPin, HIGH);
    digitalWrite(redLedPin, HIGH);
    digitalWrite(yellowLedPin, HIGH);
    digitalWrite(greenLedPin, LOW);
  }

  if (distance > 300) {
    digitalWrite(blueLedPin, HIGH);
    digitalWrite(redLedPin, HIGH);
    digitalWrite(yellowLedPin, HIGH);
    digitalWrite(greenLedPin, HIGH);
  }

  delay(100);
}