#include <DHT.h>          // DHT library for temperature and humidity
#include <Adafruit_Sensor.h>

#define DHTPIN 15         // DHT sensor pin
#define DHTTYPE DHT22     // Define DHT sensor type (DHT22)
DHT dht(DHTPIN, DHTTYPE);

#define TEMP_THRESHOLD 30     // Example temperature threshold in Celsius
#define HUMIDITY_THRESHOLD 70 // Example humidity threshold in %


#define HEATER_PIN 14         // Heater control pin
#define MOTOR_PIN 13          // DC motor control pin
#define PELTIER_PIN 27        // Peltier module control pin


float temperature = 0.0, humidity = 0.0;

void setup() {
  Serial.begin(9600);
  
  // Initialize sensors
  dht.begin();

  // Initialize output devices
  pinMode(HEATER_PIN, OUTPUT);
  pinMode(MOTOR_PIN, OUTPUT);
  pinMode(PELTIER_PIN, OUTPUT);


  // Turn off all output devices initially
  digitalWrite(HEATER_PIN, LOW);
  digitalWrite(MOTOR_PIN, LOW);
  digitalWrite(PELTIER_PIN, LOW);
}

void loop() {
  // Read temperature and humidity
  temperature = dht.readTemperature();
  humidity = dht.readHumidity();
  
  // Print sensor readings
  Serial.print("Temperature: "); Serial.print(temperature); Serial.println(" *C");
  Serial.print("Humidity: "); Serial.print(humidity); Serial.println(" %");

  // Control logic for output devices
  controlHeater();
  controlDCMotor();
  controlPeltier();
  
  delay(2000); // Adjust delay as per required sampling rate
}

void controlHeater() {
  if (temperature < TEMP_THRESHOLD) {
    digitalWrite(HEATER_PIN, HIGH); // Turn on heater if temperature is below threshold
    Serial.println("Heater ON");
  } else {
    digitalWrite(HEATER_PIN, LOW); // Turn off heater
    Serial.println("Heater OFF");
  }
}


void controlDCMotor() {
  if (humidity > HUMIDITY_THRESHOLD) {
    digitalWrite(MOTOR_PIN, HIGH); // Run motor if humidity is high
    Serial.println("DC Motor ON");
  } else {
    digitalWrite(MOTOR_PIN, LOW);
    Serial.println("DC Motor OFF");
  }
}

void controlPeltier() {
  if (temperature > TEMP_THRESHOLD) {
    digitalWrite(PELTIER_PIN, HIGH); // Cool down if temperature exceeds threshold
    Serial.println("Peltier ON (Cooling)");
  } else {
    digitalWrite(PELTIER_PIN, LOW);
    Serial.println("Peltier OFF");
  }
}