/*
 * This ESP32 code is created by esp32io.com
 *
 * This ESP32 code is released in the public domain
 *
 * For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-ultrasonic-sensor-led
 

#define TRIG_PIN  26 // ESP32 pin GIOP26 connected to Ultrasonic Sensor's TRIG pin
#define ECHO_PIN  25 // ESP32 pin GIOP25 connected to Ultrasonic Sensor's ECHO pin
#define LED_PIN   18 // ESP32 pin GIOP17 connected to LED's pin
#define DISTANCE_THRESHOLD 119 // centimeters

// variables will change:
float duration_us, distance_cm;

void setup() {
  Serial.begin (9600);       // initialize serial port
  pinMode(TRIG_PIN, OUTPUT); // set ESP32 pin to output mode
  pinMode(ECHO_PIN, INPUT);  // set ESP32 pin to input mode
  pinMode(LED_PIN, OUTPUT);  // set ESP32 pin to output mode
}

void loop() {
  // 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;

  if (distance_cm < DISTANCE_THRESHOLD)
    digitalWrite(LED_PIN, HIGH); // turn on LED
  else
    digitalWrite(LED_PIN, LOW);  // turn off LED

  // print the value to Serial Monitor
  Serial.print("distance: ");
  Serial.print(distance_cm);
  Serial.println(" cm");

  delay(500);
}
*/


#define BLYNK_TEMPLATE_ID "TMPL3fzueJNok"
#define BLYNK_TEMPLATE_NAME "Ultrasonic"
#define BLYNK_PRINT Serial
#include <BlynkSimpleEsp32.h>
#include "BlynkEdgent.h"

#define echoPin 32
#define trigPin 33

long duration;
int distance; 

void ultrasonic()
{
    digitalWrite(trigPin, LOW);
    delayMicroseconds(2);
    digitalWrite(trigPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigPin, LOW);
    duration = pulseIn(echoPin, HIGH);
    distance = duration * 0.034 / 2; //formula to calculate the distance for ultrasonic sensor
    Serial.print("Distance: ");
    Serial.println(distance);
    Blynk.virtualWrite(V0, distance);
    delay(500);
}
void setup()
{
  Serial.begin(9600);
  pinMode(34, INPUT);
  pinMode(trigPin, OUTPUT); 
  pinMode(echoPin, INPUT); 
  BlynkEdgent.begin();
  delay(2000); 
}

void loop() 
{
  BlynkEdgent.run();
  ultrasonic();
}