#include <Adafruit_Sensor.h>
#include <DHT_U.h> // DHT sensor library

// Defining Pins
#define DHTPIN 12     // Pin where DHT22 is connected
#define FAN_PIN 26    // Pin where the fan (simulated by an LED) is connected

// DHT parameters
#define DHTTYPE    DHT22  // DHT 22 (AM2302)
DHT_Unified dht(DHTPIN, DHTTYPE);

float temp;
const float thresholdTemp = 35.0;  // Threshold temperature for fan activation

void setup() {
  Serial.begin(115200);
  // Initialize DHT sensor
  dht.begin();
  pinMode(FAN_PIN, OUTPUT);
  digitalWrite(FAN_PIN, LOW); // Fan off initially
  
  Serial.println("Temperature monitoring started...");
}

void loop() {
  // Read temperature from DHT22 sensor
  sensors_event_t event;
  dht.temperature().getEvent(&event);
  if (isnan(event.temperature)) {
    Serial.println(F("Error reading temperature!"));
  } else {
    temp = event.temperature;
    Serial.print(F("Temperature: "));
    Serial.print(temp);
    Serial.println(F("°C"));
    
    // Check if temperature exceeds the threshold
    if (temp > thresholdTemp) {
      Serial.println("Temperature exceeded threshold! Turning on fan...");
      digitalWrite(FAN_PIN, HIGH);  // Turn on fan
    } else {
      Serial.println("Temperature below threshold. Fan is off.");
      digitalWrite(FAN_PIN, LOW);   // Turn off fan
    }
  }
  delay(1000);  // Wait 1 second before next reading
}