#define BLYNK_TEMPLATE_ID "TMPL6EmM6N_Z-"
#define BLYNK_TEMPLATE_NAME "IOT"
#define BLYNK_AUTH_TOKEN "PmXvTNNf1QuYO6YDYFYEwLHambGbuAyq"
#define TRIG_PIN 18 // ESP32 pin GIOP23 connected to Ultrasonic Sensor's TRIG pin
#define ECHO_PIN 5 // ESP32 pin GIOP22 connected to Ultrasonic Sensor's ECHO pin
#define BLYNK_PRINT Serial

float duration_us, distance_cm;
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

char auth[] = BLYNK_AUTH_TOKEN;

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

boolean st;
BlynkTimer timer;

void cek_koneksi(){ //fungsi cek koneksi dg Blynk
  st=Blynk.connected();//baca status koneksi
  Serial.print("stat Blynk: ");
  Serial.println(st);
  if(st!=true)ESP.restart();  /*ESP restart function*/
}

void kirimSensor()
{ 
  cek_koneksi();
  // generate 10-microsecond pulse to TRIG pin
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
 
  // measure duration of pulse from ECHO pin
  duration_us = pulseIn(ECHO_PIN, HIGH);
  
  // calculate the distance
  distance_cm = 0.017 * duration_us;
  Blynk.virtualWrite(V0, distance_cm);
  // print the value to Serial Monitor
  Serial.print("distanceA: ");
  Serial.print(distance_cm);
  Serial.println(" cm      ");
}

void setup() {
  // begin serial port
  Serial.begin (9600);
  // put your setup code here, to run once:
  // configure the trigger pin to output mode
  pinMode(TRIG_PIN, OUTPUT);
  // configure the echo pin to input mode
  pinMode(ECHO_PIN, INPUT);

  Blynk.begin(auth, ssid, pass);
  timer.setInterval(1000L, kirimSensor);
}

void loop() {
  // put your main code here, to run repeatedly:
  Blynk.run();
  timer.run();
}