#include <LiquidCrystal.h>
#include <Adafruit_GFX.h>
#include <Adafruit_LEDBackpack.h>
#include <DHT.h>

// Constants
#define DHT_PIN 2             // Pin connected to DHT sensor
#define LED_BAR_GRAPH_PIN A0  // Pin connected to LED bar graph (analog input)
#define BUZZER_PIN 4          // Pin connected to the buzzer
#define LCD_RS 7              // RS pin of the LCD
#define LCD_EN 8              // EN pin of the LCD
#define LCD_D4 9              // D4 pin of the LCD
#define LCD_D5 10             // D5 pin of the LCD
#define LCD_D6 11             // D6 pin of the LCD
#define LCD_D7 12             // D7 pin of the LCD
#define LCD_COLUMNS 16        // Number of columns on the LCD
#define LCD_ROWS 2            // Number of rows on the LCD

// Initialize DHT sensor
#define DHT_TYPE DHT22
DHT dht(DHT_PIN, DHT_TYPE);

// Initialize LCD display
LiquidCrystal lcd(LCD_RS, LCD_EN, LCD_D4, LCD_D5, LCD_D6, LCD_D7);

// Initialize LED bar graph
Adafruit_8x16minimatrix matrix = Adafruit_8x16minimatrix();

void setup() {
  // Initialize serial communication
  Serial.begin(9600);

  // Initialize DHT sensor
  dht.begin();

  // Initialize LCD display
  lcd.begin(LCD_COLUMNS, LCD_ROWS);
  lcd.clear();

  // Initialize LED bar graph
  matrix.begin(0x70); // Address of the LED bar graph (adjust if needed)
  matrix.clear();
  matrix.display();
}

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

  // Display temperature and humidity on the LCD
  displayTemperatureAndHumidity(temperature, humidity);

  // Update LED bar graph based on temperature threshold
  updateLEDBarGraph(temperature);

  // Activate the buzzer if the temperature exceeds 50°C
  if (temperature > 50.0) {
    activateBuzzer();
  } else {
    deactivateBuzzer();
  }

  delay(2000); // Delay for 2 seconds before updating again
}

void displayTemperatureAndHumidity(float temp, float humidity) {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temp);
  lcd.print("C");
  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(humidity);
  lcd.print("%");
}

void updateLEDBarGraph(float temp) {
  int numLedsToLight = map(int(temp), 0, 100, 0, 8); // Map temperature to LEDs
  matrix.clear();
  for (int i = 0; i < numLedsToLight; i++) {
    for (int j = 0; j < 8; j++) {
      matrix.drawPixel(i, j, LED_ON);
    }
  }
  matrix.display();
}

void activateBuzzer() {
  digitalWrite(BUZZER_PIN, HIGH);
}

void deactivateBuzzer() {
  digitalWrite(BUZZER_PIN, LOW);
}