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

#define DHTPIN 7      // DHT11 Data Pin connected to D7
#define LDRPIN A0     // LDR Pin connected to A0 (analog)
#define MICPIN A1     // Microphone Pin connected to A1 (analog)

#define DHTTYPE DHT11  // DHT11 Sensor Type
DHT dht(DHTPIN, DHTTYPE);

LiquidCrystal_I2C lcd(0x27, 20, 4);  // LCD (20x4, I2C address 0x27)

#define BUZZER_PIN 6  // Buzzer pin set to 6
#define LED_HUMIDITY 2   // LED for High Humidity
#define LED_TEMP_EXTREME 3  // LED for Extreme Temperature
#define LED_SOUND_HIGH 4    // LED for High Sound Level

unsigned long previousMillis = 0;
const long interval = 2000;  // Switch the display every 2 seconds (2000ms)
bool displayTempHumid = true;  // Flag to toggle between temperature/humidity and light/sound

// Set thresholds for triggering events
#define TEMP_THRESHOLD 30   // Extreme temperature threshold in Celsius (30°C)
#define SOUND_THRESHOLD 800 // High sound level threshold (analog value from microphone)
#define HUMIDITY_THRESHOLD 60 // High humidity threshold (%)

void setup() {
  Serial.begin(9600);
  lcd.begin();   // Initialize the LCD without specifying dimensions
  lcd.backlight();
  dht.begin();

  // Set up the pins for LEDs and Buzzer
  pinMode(BUZZER_PIN, OUTPUT);  // Ensure the buzzer pin is set to OUTPUT
  pinMode(LED_HUMIDITY, OUTPUT);
  pinMode(LED_TEMP_EXTREME, OUTPUT);
  pinMode(LED_SOUND_HIGH, OUTPUT);

  lcd.setCursor(0, 0);
  lcd.print("Initializing...");
  delay(1000);
  lcd.clear();
}

void loop() {
  // Read sensor data
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();
  int lightLevel = analogRead(LDRPIN);
  int soundLevel = analogRead(MICPIN);
  float soundDB = map(soundLevel, 0, 1023, 30, 90);  // Simulated dB-like value

  // Update the LCD 16 times per second
  unsigned long currentMillis = millis();

  // Refresh the display every 2 seconds
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;  // Update the display time

    lcd.clear();

    // Toggle between displaying temperature/humidity and light/sound
    if (displayTempHumid) {
      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("%");
    } else {
      lcd.setCursor(0, 0);
      lcd.print("Light: ");
      lcd.print(lightLevel);
      lcd.setCursor(0, 1);
      lcd.print("Sound: ");
      lcd.print(soundDB);
    }
    displayTempHumid = !displayTempHumid;  // Toggle the display
  }

  // Check for thresholds and trigger LEDs and buzzer
  bool buzzerTriggered = false;
  String triggeredSensor = "";

  // Check if temperature exceeds the extreme threshold
  if (temperature > TEMP_THRESHOLD) {
    digitalWrite(LED_TEMP_EXTREME, HIGH); // Turn on extreme temperature LED
    triggeredSensor = "Extreme Temperature";
    buzzerTriggered = true;
  } else {
    digitalWrite(LED_TEMP_EXTREME, LOW); // Turn off extreme temperature LED
  }

  // Check if sound exceeds the high sound threshold
  if (soundLevel > SOUND_THRESHOLD) {
    digitalWrite(LED_SOUND_HIGH, HIGH); // Turn on high sound LED
    triggeredSensor = "High Sound Level";
    buzzerTriggered = true;
  } else {
    digitalWrite(LED_SOUND_HIGH, LOW); // Turn off high sound LED
  }

  // Check if humidity exceeds the high humidity threshold
  if (humidity > HUMIDITY_THRESHOLD) {
    digitalWrite(LED_HUMIDITY, HIGH); // Turn on high humidity LED
    triggeredSensor = "High Humidity";
    buzzerTriggered = true;
  } else {
    digitalWrite(LED_HUMIDITY, LOW); // Turn off high humidity LED
  }

  // Trigger buzzer and print which sensor caused the trigger
  if (buzzerTriggered) {
    Serial.print("Buzzer Triggered by: ");
    Serial.println(triggeredSensor);

    digitalWrite(BUZZER_PIN, HIGH); // Turn on buzzer
    delay(1000);  // Buzzer beeps for 1 second
    digitalWrite(BUZZER_PIN, LOW);  // Turn off buzzer after 1 second

    // Debugging output
    Serial.println("Buzzer is ON for 1 second.");
  }

  delay(62);  // A small delay to help update the LCD 16 times per second
}