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

#define I2C_ADDR1 0x27
#define LCD_COLUMNS1 16
#define LCD_LINES1  2

#define I2C_ADDR2 0x20
#define LCD_COLUMNS2 16
#define LCD_LINES2  2

LiquidCrystal_I2C lcd1(I2C_ADDR1, LCD_COLUMNS1, LCD_LINES1);
LiquidCrystal_I2C lcd2(I2C_ADDR2, LCD_COLUMNS2, LCD_LINES2);

#define DHTPIN 14
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
#define LDR_PIN 15

const float GAMMA = 0.7;
const float RL10 = 33;

byte customChar[] = {
  B00000,
  B01010,
  B10101,
  B01010,
  B00100,
  B00000,
  B00000,
  B00000
};

void setup() {
  Serial.begin(9600);
  lcd1.init();
  lcd1.backlight();
  lcd2.init();
  lcd2.backlight();
  dht.begin();
  pinMode(LDR_PIN, INPUT);

  lcd1.createChar(0, customChar);
  // lcd1.createChar(1, customChar1);
  // lcd1.createChar(2, customChar2);
  // lcd1.createChar(3, customChar3);



}

void loop() {
  // Đọc giá trị từ LDR
  int analogValue = analogRead(LDR_PIN);
  float voltage = analogValue / 4096. * 3.3;
  float resistance = 2000 * voltage / (1 - voltage / 3.3);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));

  lcd1.clear(); 
  lcd1.setCursor(0, 0); 

  if (lux < 100) {
    lcd1.print("moi truong rat toi");
  } else if (lux >= 100 && lux < 500) {
    lcd1.print("anh sang yeu");
  } else if (lux >= 500 && lux < 1000) {
    lcd1.print("anh sang nhe");
  } else if (lux >= 1000 && lux < 5000) {
    lcd1.print("anh sang moi truong tu nhien");
  } else if (lux >= 5000 && lux < 50000) {
    lcd1.print("anh sang manh");
  } else {
    lcd1.print("rat sang");
  }

  lcd1.setCursor(0, 1); 
  lcd1.write(0); 

  Serial.print("Lux: ");
  Serial.println(lux);

  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();
  lcd2.setCursor(0, 0);
  lcd2.print("Temp: ");
  lcd2.print(temperature);
  lcd2.print("C");
  lcd2.setCursor(0, 1);
  lcd2.print("Humidity: ");
  lcd2.print(humidity);
  lcd2.print("%");

  delay(500);
}