#include <DHT.h>
#define DHTPIN 4        
#define RELAY_PIN 5      
#define GREEN_LED 8      
#define RED_LED 9        

#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);

void setup() {
    Serial.begin(9600);

    pinMode(RELAY_PIN, OUTPUT);
    pinMode(GREEN_LED, OUTPUT);
    pinMode(RED_LED, OUTPUT);
    
    digitalWrite(RELAY_PIN, LOW);   // Cooling system OFF
    digitalWrite(GREEN_LED, HIGH);  // Green LED ON (Normal Temp)
    digitalWrite(RED_LED, LOW);     // Red LED OFF

    dht.begin();
}

void loop() {
    float temperature = dht.readTemperature(); // Read temperature in Celsius

    // Check if the reading is valid
    if (isnan(temperature)) {
        Serial.println("Failed to read from DHT sensor!");
        return;
    }

    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.println(" °C");

    // Temperature Control Logic
    if (temperature > 35) {
        digitalWrite(RELAY_PIN, HIGH);  // Turn ON cooling system
        digitalWrite(GREEN_LED, LOW);
        digitalWrite(RED_LED, HIGH);
        Serial.println("High Temperature! Cooling system ON.");
    } 
    else if (temperature < 33) {
        digitalWrite(RELAY_PIN, LOW);   // Turn OFF cooling system
        digitalWrite(GREEN_LED, HIGH);
        digitalWrite(RED_LED, LOW);
        Serial.println("Temperature Normal. Cooling system OFF.");
    }

    delay(2000); // Wait 2 seconds before next reading
}