#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 = 2;
const int echoPin = 4;

#define SOUND_VELOCITY 0.034

long duration;
int R, H, level, u;
boolean st;

void setup() {
  H = 200;
  Serial.begin(115200);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  lcd.begin(16, 2);
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.print(" Pengukur Jarak ");
  lcd.setCursor(0, 1);
  lcd.print("    Blynk IoT   ");
  delay(3000);
  lcd.clear();
  lcd.print("Tunggu Koneksi..");
  Blynk.begin(auth, ssid, pass);
  while (!st) {
    st = Blynk.connected();
    delay(100);
  }
  lcd.clear();
  lcd.print("Koneksi Sukses !");
  delay(3000);
  lcd.clear();
  lcd.print("Jarak=");
  delay(100);
}

void loop() {
  Blynk.run();
  u++;
  if (u > 10) {
    digitalWrite(trigPin, LOW);
    delayMicroseconds(2);
    digitalWrite(trigPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigPin, LOW);
    duration = pulseIn(echoPin, HIGH);
    R = duration * SOUND_VELOCITY / 2;

    if (R <= 200 && R >= 10) {
      lcd.setCursor(6, 0);
      lcd.print(R);
      lcd.setCursor(8, 0);
      lcd.print(" cm ");
      Blynk.virtualWrite(V0, R);
    }
    u = 0;
  }
  delay(100);
}