#define BLYNK_TEMPLATE_ID "TMPL6oikB8vyH"
#define BLYNK_TEMPLATE_NAME "Tugas Akhir Laprak Judul 4"
#define BLYNK_AUTH_TOKEN "5LyPpuQeDB9ZOx8JNYYdS3-cpzISrH1q"

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

char auth[] = BLYNK_AUTH_TOKEN;  
char ssid[] = "Wokwi-GUEST"; 
char pass[] = ""; 

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

const int trigPin = 25;
const int echoPin = 26;
const int buzzerPin = 2;
long durasi;
int jarak;
boolean st;

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.clear();
  lcd.backlight();
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  Blynk.begin(auth, ssid, pass);
  while (!st) {
    st = Blynk.connected();
    delay(100);
  }
}

void loop() {
  Blynk.run();
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  durasi = pulseIn(echoPin, HIGH);
  jarak = durasi * 0.03408 / 2;
  Blynk.virtualWrite(V0, jarak);
  lcd.setCursor(0, 0);
  lcd.print("Jarak :");
  lcd.setCursor(8, 0);
  lcd.print(jarak);
  lcd.setCursor(13, 0);
  lcd.print("cm");
  if (jarak <= 30) {
    tone(buzzerPin, 2000);
  } else {
    noTone(buzzerPin);
  }
  delay(500);
  lcd.clear();
}