#define BLYNK_TEMPLATE_ID "TMPL34xHMh4dK"
#define BLYNK_TEMPLATE_NAME "EV"
#define BLYNK_AUTH_TOKEN "LLNVeXs3uEKxbfxfSB7Oq9-q-6lYME4e"

#define BLYNK_PRINT Serial

#include <Wire.h>
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <DHT.h>
#include <MPU6050.h>

// WiFi credentials
char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// DHT22 sensor
#define DHTPIN 5
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// MPU6050 sensor
MPU6050 mpu;

// Ultrasonic sensor
#define TRIG_PIN 12
#define ECHO_PIN 4

// Buzzer and LED
#define BUZZER_PIN 14
#define LED_PIN 15

BlynkTimer timer;

void setup() {
  Serial.begin(115200);
  Wire.begin();
  Blynk.begin(auth, ssid, pass);
  dht.begin();
  
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);
  
  Serial.println("Initializing MPU6050...");
  mpu.initialize();
  if (!mpu.testConnection()) {
    Serial.println("MPU6050 connection failed");
    while (1);
  }
  Serial.println("MPU6050 connection successful");

  timer.setInterval(2500L, sendSensor);
}

void loop() {
  Blynk.run();
  timer.run();
}

void sendSensor() {
  // Read DHT22 sensor data
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  
  // Read MPU6050 sensor data
  int16_t ax, ay, az;
 
  mpu.getAcceleration(&ax, &ay, &az);
  
  
  // Convert raw MPU6050 data to meaningful units
  float accel_x = ax / 16384.0;
  float accel_y = ay / 16384.0;

  
  // Read Ultrasonic sensor data
  long duration, distance;
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  
  duration = pulseIn(ECHO_PIN, HIGH);
  distance = duration * 0.034 / 2;
  
  // Control Buzzer and LED based on distance
  if (distance < 50) { // Threshold distance
    digitalWrite(BUZZER_PIN, HIGH);
    digitalWrite(LED_PIN, HIGH);
  } else {
    digitalWrite(BUZZER_PIN, LOW);
    digitalWrite(LED_PIN, LOW);
  }
  
  // Check if any read failed
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  
  // Send DHT22 data to Blynk
  Blynk.virtualWrite(V1, h);  // Humidity
  Blynk.virtualWrite(V0, t);  // Temperature
  
  // Send MPU6050 data to Blynk
  Blynk.virtualWrite(V2, accel_x);  // Acceleration x-axis (g)
  Blynk.virtualWrite(V3, accel_y);  // Acceleration y-axis (g)

  // Send Ultrasonic sensor data to Blynk
  Blynk.virtualWrite(V8, distance); // Distance (cm)
  
  // Print data to Serial Monitor
  Serial.print("Temperature : ");
  Serial.print(t);
  Serial.print("    Humidity : ");
  Serial.println(h);
  Serial.print("Accel X: "); Serial.print(accel_x); Serial.print(" g | ");
  Serial.print("Accel Y: "); Serial.print(accel_y); Serial.print(" g | ");
  Serial.print("Distance: "); Serial.print(distance); Serial.println(" cm");
}