#include <WiFi.h>
#include <ThingSpeak.h>
#include <DHTesp.h>
#include <IRremote.h>
#include <LiquidCrystal_I2C.h>

// Define LED pins
const int ledPin1 = 2;
const int ledPin2 = 4;
const int ledPin3 = 5;
const int ledPin4 = 19;

// Define PIR motion sensor pins
const int pirPin1 = 13;
const int pirPin2 = 12;
const int pirPin3 = 14;
const int pirPin4 = 26;

// Define DHT22 pin
const int DHT_PIN = 33;

// Define IR receiver pin
const int irPin = 27;

// Define buzzer pin
const int buzzerPin = 25;

// Initialize DHT sensor
DHTesp dhtSensor;

// Initialize IR receiver
IRrecv irrecv(irPin);
decode_results results;

// Initialize LCD
LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16-column, 2-row display

// WiFi credentials
const char* ssid = "Wokwi-GUEST";
const char* password = " ";

// ThingSpeak settings
const unsigned long myChannelNumber =  2451496;
const char * myWriteAPIKey = "96ISK7GELICIPP6H";

// Initialize WiFi client
WiFiClient client;

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

  // Initialize LED pins
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);
  pinMode(ledPin4, OUTPUT);

  // Initialize PIR motion sensor pins
  pinMode(pirPin1, INPUT);
  pinMode(pirPin2, INPUT);
  pinMode(pirPin3, INPUT);
  pinMode(pirPin4, INPUT);

  // Initialize IR receiver
  irrecv.enableIRIn();

  // Initialize buzzer
  pinMode(buzzerPin, OUTPUT);

  // Initialize DHT sensor
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);

  // Initialize LCD
  lcd.init();
  lcd.backlight();

  // Connect to WiFi
  connectToWiFi();

  // Initialize ThingSpeak
  ThingSpeak.begin(client);
}

void loop() {
  // Read PIR sensor states
  int pirState1 = digitalRead(pirPin1);
  int pirState2 = digitalRead(pirPin2);
  int pirState3 = digitalRead(pirPin3);
  int pirState4 = digitalRead(pirPin4);

  // Update LED states based on PIR sensor states
  digitalWrite(ledPin1, pirState1);
  digitalWrite(ledPin2, pirState2);
  digitalWrite(ledPin3, pirState3);
  digitalWrite(ledPin4, pirState4);

  // Read temperature and humidity from DHT sensor
  float temperature = dhtSensor.getTemperature();
  float humidity = dhtSensor.getHumidity();

  // Read IR receiver input
  if (irrecv.decode(&results)) {
    // Print the received IR code to Serial Monitor
    Serial.println(results.value, HEX);
    irrecv.resume(); // Receive the next value
  }

  // Sound the buzzer if any PIR sensor is triggered
  if (pirState1 || pirState2 || pirState3 || pirState4) {
    tone(buzzerPin, 1000); // Sound the buzzer at 1000Hz frequency
  } else {
    noTone(buzzerPin); // Stop the buzzer
  }

  // Display temperature and humidity on LCD
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");
  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(humidity);
  lcd.print(" %");

  // Send data to ThingSpeak
  ThingSpeak.writeField(myChannelNumber, 1, pirState1, myWriteAPIKey);
  ThingSpeak.writeField(myChannelNumber, 2, pirState2, myWriteAPIKey);
  ThingSpeak.writeField(myChannelNumber, 3, pirState3, myWriteAPIKey);
  ThingSpeak.writeField(myChannelNumber, 4, pirState4, myWriteAPIKey);
  ThingSpeak.writeField(myChannelNumber, 5, temperature, myWriteAPIKey);
  ThingSpeak.writeField(myChannelNumber, 6, humidity, myWriteAPIKey);

  delay(1000); // Wait for 1 second before sending next update
}

void connectToWiFi() {
  Serial.println("Connecting to WiFi...");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting...");
  }
  Serial.println("Connected to WiFi");
}