//YouTube|Tech at Home

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


LiquidCrystal_I2C lcd(0x27,16,2); 

#define DHTPIN 2     
#define DHTTYPE DHT22   // DHT 11

DHT dht(DHTPIN, DHTTYPE);

int in1 = 3;
int in2 =4;
int en1 = 6;
int Mode_SW = 7;
int data,Mode;


void setup() {
  Serial.begin(9600);
  dht.begin();
  lcd.init();
  //lcd.begin(); //nu merge cu lcd.begin                    
  lcd.backlight();
  lcd.setBacklight(HIGH);

  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7,INPUT_PULLUP);

}

void loop() 
{
  Mode = digitalRead(Mode_SW);
  
  if(Mode == HIGH)   //Manual mode
  {
    
    lcd.setCursor(0,0);
    lcd.print("Mode:Manual");
    while(Serial.available() > 0)
      {
        data = Serial.read();
        //Serial.println(data);    //Uncomment this line to print the incomming data 
              if(data == 'C')     //FAN Off
              {
                lcd.setCursor(0,1);
                lcd.print("Fan:OFF           ");
                delay(10);
                digitalWrite(3, LOW);
                digitalWrite(4, LOW);
                analogWrite(6, 0);
              }
              else if(data == 'D')     //FAN Low
              {
                lcd.setCursor(0,1);
                lcd.print("Fan:LOW         ");
                delay(10);
                digitalWrite(3, HIGH);
                digitalWrite(4, LOW);
                analogWrite(6, 100);
              }
              else if(data == 'E')     //FAN High
              {
                lcd.setCursor(0,1);
                lcd.print("Fan:HIGH          ");
                delay(10);
                digitalWrite(3, HIGH);
                digitalWrite(4, LOW);
                analogWrite(6, 255);
              }
      }
        
  }


if(Mode == LOW)      // Automatic mode
  {
      lcd.setCursor(0,0);
      lcd.print("Mode:Auto  ");
      delay(700);
    
      // Read temperature as Celsius (the default)
      float t = dht.readTemperature();
      lcd.setCursor(0,1);
      lcd.print("Temperature:");
      lcd.print(t);
      lcd.print("C");
      delay(20);
      
      if(t <= 28)
        {
          digitalWrite(3, LOW);
          digitalWrite(4, LOW);
          analogWrite(6, 0);
          
        }
        else if((t > 28) && (t <= 30))
        {
          digitalWrite(3, HIGH);
          digitalWrite(4, LOW);
          analogWrite(6, 100);
        }
      
        else if(t > 30)
        {
           digitalWrite(3, HIGH);
          digitalWrite(4, LOW);
          analogWrite(6, 255);
        }
    
  }
}