gistfile1.txt

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

int _brightness ;
int _time ;
int _flag ;
// For these LCD controls to work you MUST replace the standard LCD library from...
// https://github.com/marcoschwartz/LiquidCrystal_I2C
// Direct download https://github.com/marcoschwartz/LiquidCrystal_I2C/archive/master.zip
// Your project will not compile until this is done.
LiquidCrystal_I2C lcd_I2C_27(0x27,16,2); // set the LCD address for a 16 chars and 2 line display

void setup(){ 
  Serial.begin(9600); 
  lcd_I2C_27.init (); // initialize the lcd
  lcd_I2C_27.backlight();
  pinMode( 6 , OUTPUT);   // set the LED as output
  _brightness = 0 ;

  _time = 1 ;

  _flag = 1 ;

}

void loop(){  
  Serial.print(analogRead( A0 )); //Potentiometer
  Serial.print(" "); 
  Serial.println();
  Serial.print(analogRead( A1 )); //Photoresistor
  Serial.print(" "); 
  Serial.println();
  lcd_I2C_27.clear();
  if (  analogRead( A1 ) < 3000  &&  _flag == 1  ) {
    _time = constrain( map ( analogRead( A1 ) , 0 , 1023 , 1 , 300 )  , 1 , 300 )  ; //Set the time limit to 300 seconds, it would be possible to change the time limit to higher or lower values by changing the maximum number 300.
    lcd_I2C_27.setCursor(6 , 0) ;  
    lcd_I2C_27.print( _time ); 
    lcd_I2C_27.setCursor(3 , 1) ;  
    lcd_I2C_27.print( "seconds" ); //the LCD shows the instant time set up by the Potentiometer
    delay( 280 ); 
  }
  if (  analogRead( A0 ) < 600  &&  _flag == 1  ) {
    digitalWrite( 6 , HIGH );  // Sets the LED on
    delay( ( _time * 1000 ) ); //Delay for the time set up
    for (int i4 = 0 ; i4 < 255  ; ++i4 ) {
      _brightness = ( _brightness - 1.0 ) ; //Decreasing the brightness
      analogWrite(6 , _brightness);  //LED slowly diminishes
      delay( 5 );  
    }
    _flag = 0 ; 
    // When flag==1, the device is always restarting, so the light will continue to glow. 
    //The flag is set to 0 so after the glow, so the light only lights up once in the dark.
    lcd_I2C_27.setBacklight(LOW); //turn the LCD display dark
  }
  if(  analogRead( A0 ) > 500 && _flag == 0 ) {
    delay(3000);
    if(analogRead( A0 ) > 500 ){ //If the light is on for 3 seconds or more, the device resets itself so that you could adjust the time limit and turn off the light again with your smart lamp!
      _flag = 1 ; 
      lcd_I2C_27.backlight();
    }
  }
 }