#include <WiFi.h>
#include <HTTPClient.h>
#include "DHT.h"
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* server = "api.thingspeak.com";
const char* apiKey = "FE1DK2U91FW75GOI"; 
#define DHTPIN 4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

const int redPin = 15;
const int greenPin = 2;
const int bluePin = 17;
const int pirPin = 5;
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Buzzer pin
const int buzzerPin = 13;

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }

  Serial.println("Connected to WiFi");
  dht.begin();
  pinMode(pirPin, INPUT);
  lcd.init();
  lcd.backlight();

  // Initialize LED and buzzer pins
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print("°C ");
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println("%");
  if (temperature > 50 || humidity > 64) {
    digitalWrite(redPin, HIGH);
    digitalWrite(greenPin, LOW);
    digitalWrite(bluePin, LOW);
    digitalWrite(buzzerPin, HIGH);
  } else if (temperature > 25 && temperature <= 50 && humidity < 64) {
    digitalWrite(redPin, LOW);
    digitalWrite(greenPin, HIGH);
    digitalWrite(bluePin, LOW);
    digitalWrite(buzzerPin, LOW);
  } else if (temperature > 5 && temperature <= 25 && humidity < 64) {
    digitalWrite(redPin, LOW);
    digitalWrite(greenPin, LOW);
    digitalWrite(bluePin, HIGH);
    digitalWrite(buzzerPin, LOW);
  } else {
    digitalWrite(redPin, LOW);
    digitalWrite(greenPin, LOW);
    digitalWrite(bluePin, LOW);
    digitalWrite(buzzerPin, LOW);
  }
  int motionDetected = digitalRead(pirPin);
  if (motionDetected) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Unauth. entry");
    
    digitalWrite(greenPin, LOW);
    digitalWrite(bluePin, LOW);
    digitalWrite(redPin, HIGH);
    digitalWrite(buzzerPin, HIGH);
  }
  else {
    lcd.clear();
  }

  // Send data to ThingSpeak
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    String url = "http://";
    url += server;
    url += "/update?api_key=";
    url += apiKey;
    url += "&field1=";
    url += String(temperature);
    url += "&field2=";
    url += String(humidity);

    http.begin(url);
    int httpResponseCode = http.GET();
    if (httpResponseCode > 0) {
      Serial.print("HTTP Response code: ");
      Serial.println(httpResponseCode);
    } else {
      Serial.print("Error code: ");
      Serial.println(httpResponseCode);
    }
    http.end();
  }

  delay(2000); 
}