#define BLYNK_TEMPLATE_ID "TMPL38gZieQFv"
#define BLYNK_TEMPLATE_NAME "door is open"
#define BLYNK_AUTH_TOKEN "-htSoTcwzOw3IE8GpsdgGKLlOi3wSie9"
#define BLYNK_PRINT Serial
#include <WiFi.h>             // Use WiFi library for ESP32
#include <BlynkSimpleEsp32.h>  // Blynk library for ESP32

char auth[] = BLYNK_AUTH_TOKEN ; // Replace with your Blynk token
char ssid[] = "Wokwi-GUEST";       // Replace with your WiFi SSID
char pass[] = "";   // Replace with your WiFi password

#define trigPin 18  // Trigger pin (use GPIO number for ESP32)
#define echoPin 19  // Echo pin (use GPIO number for ESP32)
#define buzzerPin 5 // Buzzer pin (use GPIO number for ESP32)

long duration;
int distance;

BlynkTimer timer;

// Function to measure distance using the ultrasonic sensor
void measureDistance() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;

  if (distance < 10) { // Adjust the threshold for your door distance
    // Door is open
    digitalWrite(buzzerPin, HIGH);  // Activate buzzer
    Blynk.logEvent("Door is open!");
    Blynk.logEvent(V1, "Door is open!");  // Send message to Blynk
  } else {
    // Door is closed
    digitalWrite(buzzerPin, LOW);  // Deactivate buzzer
    Blynk.logEvent(V1, "Door is closed.");
  }
}

void setup() {
  Serial.begin(115200);  // ESP32 uses 115200 baud rate for serial communication
  Blynk.begin(auth, ssid, pass);
  
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzerPin, OUTPUT);

  // Set a timer to measure the distance every 1 second
  timer.setInterval(1000L, measureDistance);
}

void loop() {
  Blynk.run();
  timer.run(); // Run the distance measurement at set intervals
}