//* How to use the DHT-11 sensor with Arduino
//   Temperature and humidity sensor and
//   I2C LCD1602
 //  SDA --> A4
 //  SCL --> A5


//Libraries
#include <DHT.h>;
//I2C LCD:
#include <LiquidCrystal_I2C.h>
#include <Wire.h>


LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address to 0x27 for a 16 chars and 2 line display
 
//Constants
#define DHTPIN 7     // what pin we're connected to
#define DHTTYPE DHT22   // DHT 11
DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal 16mhz Arduino


//Variables
//int chk;
int h;  //Stores humidity value
int t; //Stores temperature value

// Pins for LEDs
#define LED_GREEN 2
#define LED_BLUE 3
#define LED_RED 4

void setup()
{
  Serial.begin(9600);
  // Set LED pins as OUTPUT
  pinMode(LED_GREEN, OUTPUT);
  pinMode(LED_BLUE, OUTPUT);
  pinMode(LED_RED, OUTPUT);

  Serial.println("Temperature and Humidity Sensor Test");
  dht.begin();//begin dht
  lcd.init(); //initialize the lcd
  lcd.backlight(); //open the backlight
}


void loop()
{
  //Read data and store it to variables h (humidity) and t (temperature)
  // Reading temperature or humidity takes about 250 milliseconds!
  readTempHum();
  //Print temp and humidity values to serial monitor
  printTempHum();
  // set the cursor to (0,0):
  // print from 0 to 9:
  checkTemp();  
   
  displayTempHum();

  delay(1000); //Delay 1 sec.
}

void readTempHum(){
  //Read data and store it to variables h (humidity) and t (temperature)
  // Reading temperature or humidity takes about 250 milliseconds!
  h = dht.readHumidity();
  t = dht.readTemperature();
}

void printTempHum(){
  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.print(" %, Temp: ");
  Serial.print(t);
  Serial.println(" ° Celsius");
}

void displayTempHum(){
  lcd.setCursor(0, 0);
  lcd.println(" Now Temperature ");
  
  lcd.setCursor(0, 1);
  lcd.print("T:");
  lcd.print(t);
  lcd.print("C");


  lcd.setCursor(6, 1);
  lcd.println("2024 ");
    
  lcd.setCursor(11, 1);
  lcd.print("H:");
  lcd.print(h);
  lcd.print("%");

}

void checkTemp(){
  // Display temperature color indication
  if (t >= 27 && t <= 31) {
      digitalWrite(LED_GREEN, HIGH);
      digitalWrite(LED_BLUE, LOW);
      digitalWrite(LED_RED, LOW);
  } else if (t > 31 && t <= 36) {
      digitalWrite(LED_GREEN, LOW);
      digitalWrite(LED_BLUE, HIGH);
      digitalWrite(LED_RED, LOW);
  } else if (t > 36) {
      digitalWrite(LED_GREEN, LOW);
      digitalWrite(LED_BLUE, LOW);
      digitalWrite(LED_RED, HIGH);
  }
}