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

#define PIR_PIN 14
#define DHTPIN 27 // Pin connected to DHT sensor
#define DHTTYPE DHT22 // DHT 22 sensor
#define Buzzer 4 //buzzer pin

DHT dht(DHTPIN, DHTTYPE);

WiFiClient client;

// Replace with your ThingSpeak Channel ID and API Key
const unsigned long channelId = 2434125;
const char *apiKey = "MAS41LH1LA8UYAV4";

void setup() {
  
  Serial.begin(9600);
  Serial.print("Connecting to WiFi");
  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println(" Connected!");
  
  dht.begin();

  // Initialize ThingSpeak
  ThingSpeak.begin(client);
  pinMode(Buzzer, OUTPUT);
  pinMode(PIR_PIN, INPUT);
}

void loop() {

  // Reading temperature or humidity takes about 250 milliseconds!
  float humidity = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float temperature = dht.readTemperature();
  // Read temperature as Fahrenheit (isFahrenheit = true)
  //float t = dht.readTemperature(true);

  // Check if any reads failed and exit early (to avoid NaN)
  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Show humidity data in percentage
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print("% ");

  // Show temperature data in Celsius
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println("°C");

  int motion = digitalRead(PIR_PIN);

  if (motion == HIGH) {
    Serial.println("Motion detected!");
  } 
  else {
    Serial.println("No motion.");
  }

  if((temperature<15||temperature>30) || (humidity<30||humidity>60)){
    Serial.println("Alert!!!");
    digitalWrite(Buzzer, HIGH);
    delay(1000);
    digitalWrite(Buzzer, LOW);
    delay(1000);
  }

  // set the fields with the values
  ThingSpeak.setField(1, temperature);
  ThingSpeak.setField(2, humidity);
  // Update ThingSpeak channel with sensors data
  ThingSpeak.writeFields(channelId, apiKey);
  delay(2000);

}