#define BLYNK_TEMPLATE_ID "TMPL6DXzfoe9D"
#define BLYNK_TEMPLATE_NAME "ESP ARIYO"
#define BLYNK_AUTH_TOKEN "ybTkAAb-via-TN8KYGFMP9QWO2DC9f1j"

#include <Wire.h>
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <LiquidCrystal_I2C.h>

#define TRIG_PIN 23
#define ECHO_PIN 19
#define BUZZER_PIN 17

LiquidCrystal_I2C lcd(0x27, 16, 2);
BlynkTimer timer;

long duration;
float distance;
bool buzzerEnabled = true;

char auth[] = "ybTkAAb-via-TN8KYGFMP9QWO2DC9f1j";
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

BLYNK_WRITE(V0) {
  int value = param.asInt();
  buzzerEnabled = value;
  if (!buzzerEnabled) noTone(BUZZER_PIN);
}

void readUltrasonic() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  duration = pulseIn(ECHO_PIN, HIGH, 30000);
  distance = (duration * 0.034) / 2;

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

  lcd.setCursor(0, 0);
  lcd.print("Jarak: ");
  lcd.print(distance);
  lcd.print(" cm    ");

  Blynk.virtualWrite(V1, (int)distance);

  if (buzzerEnabled && distance > 0 && distance < 10) {
    tone(BUZZER_PIN, 1000);
    lcd.setCursor(0, 1);
    lcd.print("Object Detected!");
  } else {
    noTone(BUZZER_PIN);
    lcd.setCursor(0, 1);
    lcd.print("                ");
  }
}

void setup() {
  Serial.begin(115200);
  Blynk.begin(auth, ssid, pass);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("HC-SR04 Active");
  delay(2000);
  lcd.clear();
  timer.setInterval(1000L, readUltrasonic);
}

void loop() {
  Blynk.run();
  timer.run();
}