/* Fill-in information from Blynk Device Info here */
#define BLYNK_TEMPLATE_ID "TMPL6Tyz_YreY"
#define BLYNK_TEMPLATE_NAME "Smart Environmental Monitoring and Alert System"
#define BLYNK_AUTH_TOKEN "bl6RMyD73eGliJjpMmELlR5xl9ojTpIK"

/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>  // Correct library for ESP32
#include <DHT.h>

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


// Pin Definitions
#define DHTPIN 12          // DHT22 data pin
#define TRIG_PIN 23        // Ultrasonic Trigger pin
#define ECHO_PIN 22        // Ultrasonic Echo pin
#define LDR_PIN 34          // LDR analog pin
#define BUZZER_PIN 33      // Buzzer pin

// DHT Sensor Settings
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// Ultrasonic Sensor Variables
long duration;
float distance;

// Blynk Timer
BlynkTimer timer;

void setup() {
  // Debug console
  Serial.begin(115200);

  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
  dht.begin();  // Initialize DHT sensor

  // Setup pins
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  digitalWrite(BUZZER_PIN, LOW);  // Ensure buzzer is off initially

  // Timer setup to send sensor data every 2 seconds
  timer.setInterval(2000L, sendSensorData);

  Serial.println("System Initialized...");
}

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

void sendSensorData() {
  // Read DHT22 Data
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  if (!isnan(temperature) && !isnan(humidity)) {
    Blynk.virtualWrite(V1, temperature);  // Send temperature to Blynk
    Blynk.virtualWrite(V2, humidity);     // Send humidity to Blynk
  }

  // Read Ultrasonic Sensor Data
  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;
  Blynk.virtualWrite(V3, distance);  // Send distance to Blynk

  // Read LDR Sensor Value
  int ldrValue = analogRead(LDR_PIN);
  Blynk.virtualWrite(V4, ldrValue);  // Send LDR value to Blynk

  // Buzzer logic and LED feedback in Blynk
  if (temperature > 30.0 || distance < 20.0 || ldrValue < 300) {
    Serial.println("Alert - Activating Buzzer!");
    activateBuzzer();
    Blynk.virtualWrite(V5, 255);  // Turn on Blynk LED (V5)
  } else {
    Blynk.virtualWrite(V5, 0);    // Turn off Blynk LED (V5)
  }
}

void activateBuzzer() {
  digitalWrite(BUZZER_PIN, HIGH);  // Turn buzzer on
  delay(500);
  digitalWrite(BUZZER_PIN, LOW);   // Turn buzzer off
}