#include <DHT.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Pin definitions
#define DHTPIN 15           // DHT22 data pin connected to GPIO 15
#define DHTTYPE DHT22       // Define the sensor type as DHT22
#define PIR_PIN 4           // PIR sensor connected to GPIO 4
#define RED_LED 16          // Red LED connected to GPIO 16
#define GREEN_LED 17        // Green LED connected to GPIO 17
#define BLUE_LED 18         // Blue LED connected to GPIO 18
#define BUZZER_PIN 19       // Buzzer connected to GPIO 19

// Initialize DHT sensor
DHT dht(DHTPIN, DHTTYPE);

// Initialize LCD (I2C address 0x27 for Wokwi, change to 0x3F if needed)
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  // Initialize serial monitor
  Serial.begin(115200);

  // Initialize DHT sensor
  dht.begin();

  // Initialize LCD with 16 columns and 2 rows
  lcd.begin(16, 2);
  lcd.backlight();

  // Initialize PIR sensor, LEDs, and Buzzer
  pinMode(PIR_PIN, INPUT);
  pinMode(RED_LED, OUTPUT);
  pinMode(GREEN_LED, OUTPUT);
  pinMode(BLUE_LED, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  // Start with LEDs and Buzzer off
  digitalWrite(RED_LED, LOW);
  digitalWrite(GREEN_LED, LOW);
  digitalWrite(BLUE_LED, LOW);
  digitalWrite(BUZZER_PIN, LOW);

  // Display initial message on LCD
  lcd.setCursor(0, 0);
  lcd.print("Temp & Humidity");
  delay(1000); // Delay to ensure initial message displays on Wokwi
}

void loop() {
  // Read temperature and humidity from DHT22
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Check if reading is valid
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    lcd.setCursor(0, 0);
    lcd.print("DHT Read Error!  ");
  } else {
    // Print readings to Serial Monitor
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.print(" °C, Humidity: ");
    Serial.print(humidity);
    Serial.println(" %");

    // Display on LCD
    lcd.clear();
    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(" %");
  }

  // Read PIR sensor
  int pirState = digitalRead(PIR_PIN);

  if (pirState == HIGH) {
    Serial.println("Motion detected!");
    digitalWrite(BUZZER_PIN, HIGH); // Turn on buzzer
    digitalWrite(RED_LED, HIGH);    // Turn on red LED
    delay(500);                     // Buzzer delay
    digitalWrite(BUZZER_PIN, LOW);  // Turn off buzzer
  } else {
    digitalWrite(RED_LED, LOW);     // Turn off red LED
  }

  // Example LED indicators based on temperature (customize thresholds as needed)
  if (temperature > 30) {
    digitalWrite(GREEN_LED, HIGH);   // High temperature, green LED on
    digitalWrite(BLUE_LED, LOW);     // Low temperature, blue LED off
  } else {
    digitalWrite(GREEN_LED, LOW);    // High temperature, green LED off
    digitalWrite(BLUE_LED, HIGH);    // Low temperature, blue LED on
  }

  delay(1000); // Delay for stability
}