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

// DHT Sensor setup
DHT dht(32, DHT22);

// LCD setup
byte dot[8] = {0x0E, 0x0A, 0x0E, 0x00, 0x00, 0x00, 0x00, 0x00};
LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {
  // Initialize serial
  Serial.begin(115200);
  Serial.println("Hello Lab 3");
  
  // Initialize DHT sensor
  dht.begin();
  
  // Initialize LCD
  lcd.init();
  lcd.backlight();
  lcd.createChar(0, dot);  // store dot[] into slot 0
}

void loop() {
  // Read sensor values
  float h = dht.readHumidity();         // Relative humidity
  float c = dht.readTemperature();      // Celsius
  float f = dht.readTemperature(true);  // Fahrenheit
  
  // Check if any reads failed and try again
  if (isnan(h) || isnan(c) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Sensor Error!");
    delay(2000);
    return;
  }

  // Print to serial monitor
  Serial.printf("Humidity: %.1f%%, Temperature: %.2f°C, %.1f°F\n", h, c, f);

  // Display on LCD
  lcd.setCursor(0, 0);
  lcd.print("Humidity: "); lcd.print(h, 1); lcd.print("%");
  
  lcd.setCursor(0, 2);
  lcd.print("Temperature: "); lcd.print(c, 2); lcd.write(0); lcd.print("C");

  lcd.setCursor(0, 3);
  lcd.print("Temperature: "); lcd.print(f, 1); lcd.write(0); lcd.print("F");

  delay(4000);  // Wait 4 seconds between readings
}