const int ledPin = 13;    //define the LED pin

void setup(){

  pinMode(ledPin, OUTPUT);    //initialize LED output

  Serial.begin(9600);         //start the serial communication

}

void loop(){

  if(Serial.available() > 0){           //if some data is available of in the serial port

    char ledPinState = Serial.read();   //read the value

    if(ledPinState == '1'){             //if statement will be true(1)

      digitalWrite(ledPin, HIGH);       //turn ON the LED

    }

    if(ledPinState == '0'){             //if statement will be false(0)

      digitalWrite(ledPin, LOW);        //turn OFF the LED

    }

  }

}

import processing.serial.*;      //import the library for a serial communication (sketch-import library-serial)

Serial myPort;                  //define name of the serial communication

PImage as;                      //add the background image.Declare variable "bg" of type PImage

void setup(){                   //we will set a resolution for the graphical window

  size(000, 000);               //set the image size 

 as=loadImage ("namae.photo");  //upload the image into the program

  //the image file must be in the data folder of the current sketch to load successfully

  myPort=new Serial(this, "COM3", 9600);  //se the name of our communication port (Arduino COM port)

}

void draw(){                    //draw function - here is graphical screen

  background(as);               //set the background image

  if(mousePressed && (mouseButton == LEFT)){    //get the value of the mouse for the LED turn ON/OFF

    myPort.write('1');          //if pressed the left buton on the screen we will send to the serial port character 1

  }

  if(mousePressed && (mouseButton == RIGHT)){

    myPort.write('0');          //the led turn off

  }

}