#define BLYNK_TEMPLATE_ID "TMPL2fncfpLtN"
#define BLYNK_TEMPLATE_NAME "esp"
#define BLYNK_AUTH_TOKEN "iT3RMf_ITB3yMAL-haL6_rsw7NIrEKz3"

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

// Pin definitions
#define TRIG_PIN 4  // Pin connected to Trig pin of ultrasonic sensor
#define ECHO_PIN 5  // Pin connected to Echo pin of ultrasonic sensor
#define LEDPIN 2    // Pin connected to the onboard LED (GPIO 2)

// Blynk credentials
char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "network";
char pass[] = "12345678";

void setup() {
  Serial.begin(115200);
  Blynk.begin(auth, ssid, pass);
  pinMode(LEDPIN, OUTPUT);  // Set LED pin as output
  pinMode(TRIG_PIN, OUTPUT); // Set Trig pin as output
  pinMode(ECHO_PIN, INPUT);  // Set Echo pin as input
}

BLYNK_WRITE(V3) {
  int ledState = param.asInt(); // Get the value from the Blynk app (V3)
  digitalWrite(LEDPIN, ledState); // Control LED based on Blynk command
}

void loop() {
  Blynk.run(); // Run Blynk
  
  // Clear the Trig pin
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);

  // Trigger the sensor by setting the Trig pin HIGH for 10 microseconds
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  // Read the Echo pin and calculate the distance
  long duration = pulseIn(ECHO_PIN, HIGH);
  int distance = duration * 0.034 / 2;

  // Send the distance to the Blynk app
  Blynk.virtualWrite(V4, distance); // Send distance data to virtual pin V4

  delay(1000); // Delay between reads
}