#define BLYNK_TEMPLATE_ID "TMPL2eOX2iD_l"
#define BLYNK_TEMPLATE_NAME "WiFeS" 
#define BLYNK_AUTH_TOKEN "1cHV5DfpNuBBIDcBzRSPbJCSNu42Pjy_" 

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

   // Wi-Fi details (Wokwi uses default guest network)
char ssid[] = "Wokwi-GUEST";
char pass[] = ""; 
     
// Blynk virtual pin 
#define PIR_PIN 34 
#define LED1_PIN 23 
int motionState; 

#define LDR_PIN 35 // Light sensor analog pin 
#define LED2_PIN 19 // LED output pin 
const int DARK_THRESHOLD = 500;
int LighValue = LOW; // Variables 
bool manualOff = false;

// Manual control flag
bool lightOn = false; 
        
// Light state tracking
#define SMOKE_SENSOR_PIN 32 // MQ-2 analog pin 
#define BUZZER_PIN 5 // Buzzer output pin 
int smokeLevel = 0;
int threshold = 500; // Adjust sensitivity
bool buzzerEnabled = false; // Controlled by Blynk switch
bool SmokeOn = true ; 

BlynkTimer timer; 

// Function to read PIR sensor 
void checkMotion() { 
int motion = digitalRead(PIR_PIN); 
if (motion == HIGH && motionState == LOW)
{ motionState = HIGH;
  digitalWrite(LED1_PIN, HIGH); 
  Serial.println("Motion Detected!"); //Send push notification to phone 
  Blynk.logEvent("motion_alert", "Motion detected in your house!"); //Send update to Blynk dashboard 
  Blynk.virtualWrite(V1, "Motion Detected"); 
  } else if (motion == LOW && motionState == HIGH) { 
    motionState = LOW;
    digitalWrite(LED1_PIN, LOW); 
    Serial.println(" No Motion"); 
    Blynk.logEvent("motion_alert: No motion detected"); // Update Blynk dashboard
    Blynk.virtualWrite(V1, " No Motion");
   } 
} 

// Function to check LDR value and control LED 
void checkLightLevel() { 
  int lightValue = analogRead(LDR_PIN);
  Serial.print("Light Level: ");
  Serial.println(lightValue); //Check darkness and manual state 
  if (lightValue > DARK_THRESHOLD && !manualOff) { 
  if (!lightOn)
  { lightOn = true; 
  digitalWrite(LED2_PIN, HIGH);
  Serial.println("It's dark - LED turned ON!");
  Blynk.logEvent("dark_alert:", "It's dark! Light turned ON.");
  Blynk.virtualWrite(V2,1); // update app LED widget 
  } 
  } else {
    if (lightOn) { lightOn = false;
    digitalWrite(LED2_PIN, LOW);
    Serial.println(" - LED turned OFF");
    Blynk.virtualWrite(V2, 0);
     }
  }
 } 
 //Manual button handler from app 
 BLYNK_WRITE(V2) { int buttonState = param.asInt();
  if (buttonState == 1) { 
    manualOff = true; 
    digitalWrite(LED2_PIN, LOW);
    lightOn = false; Serial.println("Manual override: Light turned OFF"); 
    Blynk.logEvent("dark_alert", "Light manually turned OFF."); //Send update to Blynk dashboard
    Blynk.virtualWrite(V2, "Light turned OFF");
  } else { 
        manualOff = false; 
        Serial.println("Manual control released, auto mode resumed.");
      } 
} 
void checkSmokeLevel() {
   smokeLevel = analogRead(SMOKE_SENSOR_PIN); 
   Serial.print("Smoke Level: "); 
   Serial.println(smokeLevel); 
   if (smokeLevel > threshold && buzzerEnabled) {
     if (SmokeOn) { 
      SmokeOn = true;
      digitalWrite(BUZZER_PIN, HIGH);
      Serial.println("Smoke Detected!");
      Blynk.logEvent("smoke_alert", "Smoke detected! Please check your home.");
      Blynk.virtualWrite(V3, 1);
      } 
    } else { 
      if (SmokeOn) {
         SmokeOn = false;
        digitalWrite(BUZZER_PIN, LOW); 
        Serial.println("No Smoke Detected!"); 
        Blynk.virtualWrite(V3, 1);
      } else {
        digitalWrite(BUZZER_PIN, LOW);
        }
    } 
    //delay(9600); 
 } 
  // Blynk switch widget callback
  BLYNK_WRITE(V3) { 
    int value = param.asInt();
     if (value == 1) {
       buzzerEnabled = true;
        digitalWrite(BUZZER_PIN, LOW);
        SmokeOn = false; 
        Serial.println("Buzzer manually turned OFF via Blynk");
        Blynk.logEvent("smoke_alert", "Buzzer turned OFF."); //Blynk.virtualWrite(V3, "Buzzer turned OFF");
       } 
       //else {
        //buzzerEnabled = false; 
        //Serial.println("Buzzer control enabled");
        //} 
 }  

void setup() {
   Serial.begin(115200); 
   pinMode(LDR_PIN, INPUT); 
   pinMode(LED2_PIN, OUTPUT); 
   pinMode(PIR_PIN, INPUT);
   pinMode(LED1_PIN, OUTPUT); 
   pinMode(SMOKE_SENSOR_PIN, INPUT); 
   pinMode(BUZZER_PIN, OUTPUT); 
   //digitalWrite(BUZZER_PIN, LOW); 
    Serial.println(" Connecting to WiFi..."); 
    WiFi.begin(ssid, pass); 
    while (WiFi.status() != WL_CONNECTED) { 
      delay(1000); 
      Serial.print("."); 
      }
       Serial.println("\n WiFi Connected!"); // Connect to Blynk Cloud 
       Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass); 
       Serial.println("Connected to Blynk Cloud!"); 
       
       // Wait for 5ms beforee reading again
        timer.setInterval(500L, checkMotion); 
        timer.setInterval(500L, checkLightLevel); 
        timer.setInterval(500L, checkSmokeLevel);
} 
     void loop()
      { 
      Blynk.run(); timer.run();
     }