#define BLYNK_TEMPLATE_ID "TMPL69CaT2QGt"
#define BLYNK_TEMPLATE_NAME "IOTProjecty3"
#define BLYNK_PRINT Serial

#define MQ2_ANA 0 //Gassensor Analog pin
#define MQ2_DIG 2 //Gassensor Digital pin
#define DHTPIN 16
#define DHTTYPE DHT11

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

char auth[] = "FbVqetHmU1w7hVXbAiZcg3qCCkcRwxa9";
char ssid[] = "Jinxx1490_2.4G";
char pass[] = "0926083366";
WiFiClient espClient;

const int relayPin = 12; 
const int gasThreshold = 20;
int led_pin = 25;// mog up the fan
int data25;

DHT dht(DHTPIN, DHTTYPE);
bool manualMode = false;  // Flag to track if the relay is in manual mode

void setup() {

  dht.begin();
  Blynk.begin(auth, ssid, pass);
  Serial.begin(9600);

  pinMode(MQ2_ANA, INPUT);
  pinMode(MQ2_DIG, INPUT);
  pinMode(led_pin, OUTPUT);
  pinMode(relayPin, OUTPUT);

  digitalWrite(relayPin, LOW);
  
  delay(2000);
}

BLYNK_WRITE(V1)
{
 int relayControl = param.asInt();  // Get value from Blynk app
  manualMode = (relayControl == 1);  // Set manual mode based on app input
 
  if (manualMode)
  {
    digitalWrite(relayPin, HIGH);  // Turn on relay in manual mode
  }
  else
  {
    digitalWrite(relayPin, LOW);  // Turn off relay when exiting manual mode
  }
 
  Blynk.virtualWrite(V3, relayControl);  // Update relay status on
}


void loop() {

 Blynk.run();  // Run Blynk
 
  int sensorValue = analogRead(MQ2_ANA);  // Read gas sensor value
  int gas_percentage = map(sensorValue, 0, 4095, 0, 100);  // Convert to percentage
 
  float humidity = dht.readHumidity();  // Read humidity from DHT sensor
  float temperature = dht.readTemperature();  // Read temperature from DHT sensor
 
  // Check if sensor readings are valid
  if (isnan(humidity) || isnan(temperature))
  {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }
 
  // Print sensor values to the Serial Monitor
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println("%");
 
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println("°C ");
 
  Serial.print("Gas sensor value: ");
  Serial.println(sensorValue);
 
  Serial.print("Gas Percentage: ");
  Serial.print(gas_percentage);
  Serial.println("%");
 
  Serial.println();
 
  // Automatic control logic based on gas levels
  if (!manualMode)
  {
    if (gas_percentage > gasThreshold)
    {
      digitalWrite(relayPin, HIGH);  // Activate relay if gas above threshold
      Blynk.virtualWrite(V3, HIGH);  // Update Blynk app
    }
    else
    {
      digitalWrite(relayPin, LOW);  // Deactivate relay if gas below threshold
      Blynk.virtualWrite(V3, LOW);  // Update Blynk app
    }
  }
 
  // Send sensor values to Blynk
  Blynk.virtualWrite(V0, gas_percentage);  // Send gas percentage
  Blynk.virtualWrite(V1, temperature);  // Send temperature
  Blynk.virtualWrite(V2, humidity);  // Send humidity
 
  delay(1000);  // Wait for a second before next loop iteration
}