include <DHT.h>
#include <WiFi.h>  
#include <ThingSpeak.h>

#define RELAY_PIN 5       
#define TEMP_THRESHOLD 30 
int dhtpin = 15;
DHT dht22(dhtpin,DHT22);
WiFiClient client;

char ssid[] = "Wokwi-GUEST";
char pass[] = "";

long int mychannelid = 2773270;
char mywriteapikey[] = "T546I1U02HZ9R746";

void setup() {
  Serial.begin(115200);
  dht22.begin();
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW);
  
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to Wi-Fi...");
  }
  Serial.println("Connected to Wi-Fi!");

  ThingSpeak.begin(client);
}

void loop() {
  float temperature = dht22.readTemperature();
  float humidity = dht22.readHumidity();

  
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C, Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

  if (temperature > TEMP_THRESHOLD) {
    digitalWrite(RELAY_PIN, HIGH); 
    Serial.println("Cooling system ON");
  } else {
    digitalWrite(RELAY_PIN, LOW); 
    Serial.println("Cooling system OFF");
  }

  ThingSpeak.setField(1, temperature);
  ThingSpeak.setField(2, humidity);

  int x = ThingSpeak.writeFields(mychannelid, mywriteapikey);
  if (x == 200) {
    Serial.println("Data sent to ThingSpeak successfully!");
  } else {
    Serial.print("Error sending data to ThingSpeak: ");
    Serial.println(x);
  }

  delay(15000);
}