#include <DHT.h>

#define DHTPIN1 25   // Pin connected to DHT sensor 1 (adjust as needed)
#define DHTPIN2 26   // Pin connected to DHT sensor 2 (adjust as needed)
#define DHTPIN3 33   // Pin connected to DHT sensor 3 (adjust as needed)
#define DHTTYPE DHT22 // DHT sensor type (DHT22)

#define FANPIN1 18    // Pin connected to fan 1
#define FANPIN2 19    // Pin connected to fan 2
#define BUTTON_PIN 27 // Pin connected to the button

DHT dht1(DHTPIN1, DHTTYPE); // DHT object for sensor 1
DHT dht2(DHTPIN2, DHTTYPE); // DHT object for sensor 2
DHT dht3(DHTPIN3, DHTTYPE); // DHT object for sensor 3

int buttonState = LOW;     // Current button state
int lastButtonState = LOW; // Previous button state
int newLastButtonState = LOW;
unsigned long fanButtonTimer = 0; // Time when button was pressed
int isSensorActive = 0;

float humidity1;
float humidity2;
float humidity3;

void setup() {
  Serial.begin(9600);     // Start serial communication for debugging (optional)
  pinMode(FANPIN1, OUTPUT); // Set fan 1 pin as output
  pinMode(FANPIN2, OUTPUT); // Set fan 2 pin as output
  pinMode(BUTTON_PIN, INPUT_PULLUP); // Set button pin as input with pull-up resistor
  dht1.begin();           // Initialize DHT sensor 1
  dht2.begin();           // Initialize DHT sensor 2
  dht3.begin();           // Initialize DHT sensor 3
}

void loop() {

  // Read button state and handle manual override
  buttonState = digitalRead(BUTTON_PIN);
  if (buttonState != lastButtonState && buttonState == LOW) { // Button state changed and Button pressed
      if (fanButtonTimer == 0) {             // Button pressed for the first time
        fanButtonTimer = millis();
        newLastButtonState = HIGH;
        isSensorActive = 1;           // Start timer
        digitalWrite(FANPIN1, HIGH);
        digitalWrite(FANPIN2, HIGH);
      } else {                           // Button pressed again (within 5 mins)
        fanButtonTimer = 0;
        newLastButtonState = LOW;                    // Reset timer (fans turn off)
        digitalWrite(FANPIN2, LOW);  // Fan 2 off
        digitalWrite(FANPIN1, LOW);
        isSensorActive = 0;  // Fan 1 off
      } 

    
  }

  // Turn off fans after 5 minutes if button was pressed
  if (fanButtonTimer > 0 && millis() - fanButtonTimer >= 5 * 1000) {
    digitalWrite(FANPIN1, LOW);
    digitalWrite(FANPIN2, LOW);
    newLastButtonState = LOW;
    fanButtonTimer = 0;
  }

  lastButtonState = buttonState; // Update last button state

  // // Optional: Print sensor readings for debugging (uncomment to use)
  // Serial.print("Humidity 1: ");

  // Serial.println(buttonState);
  // Serial.println(" ");
  // Serial.println(isSensorActive);


  humidity3 = dht3.readHumidity();

  // Check humidity only if button is not pressed
  if (newLastButtonState == LOW) { // Button not pressed (active low)
    if (isSensorActive == 1) {
      humidity1 = dht1.readHumidity();
      humidity2 = dht2.readHumidity();
      Serial.print(humidity1);
      Serial.print(" ");
      Serial.println(humidity2);
    }
    // Control fans based on humidity for sensor 1
    if (humidity1 > humidity3 + 10) {
      digitalWrite(FANPIN1, HIGH); // Fan 1 on
    } else {
      digitalWrite(FANPIN1, LOW);  // Fan 1 off
    }
    // Control fans based on humidity for sensor 2
    if (humidity2 > humidity3 + 10) {
      digitalWrite(FANPIN2, HIGH); // Fan 2 on
    } else {
      digitalWrite(FANPIN2, LOW);  // Fan 2 off
    }
  }
  delay(100); // Delay between readings (adjust if needed)
}