Arduino Uno Mouse

MouseArduino

const int LEFT_BUTTON   =2;  //Input pin for the left button
const int MIDDLE_BUTTON =3;  //Input pin for the middle button
const int RIGHT_BUTTON  =4;  //Input pin for the right button
const int X_AXIS        =0;  //Joystick x-axis analog pin
const int Y_AXIS        =1;  //Joystick y-axis analog pin


int val; //For holding mapped pot value

int readJoystick(int axis)
{ 
  int val = analogRead(axis);        //Read analog value
  //val = map(val, 0, 1023, -10, 10);  //Map the reading

  if (val <= 2 && val >= -2)         //Create dead zone to stop mouse drift
    return 0; 
 
  else                               //Return scaled value
    return val;
}

void setup()
{ 
  pinMode(LEFT_BUTTON, INPUT);
  pinMode(MIDDLE_BUTTON, INPUT);
  pinMode(RIGHT_BUTTON, INPUT);
  Serial.begin(9600); //Start Serial
}

void loop()
{
  
  int xVal = analogRead(X_AXIS);
  int yVal = analogRead(Y_AXIS);
  
  Serial.print(xVal);
  Serial.print(",");
  Serial.print(yVal);
  Serial.print(",");
  Serial.print((boolean)digitalRead(LEFT_BUTTON));//Send value
  Serial.print(",");  
  Serial.print((boolean)digitalRead(MIDDLE_BUTTON));
  Serial.print(",");
  Serial.println((boolean)digitalRead(RIGHT_BUTTON));
  delay(50);                                   //Delay so we don't flood the computer
}

MouseProssesing

/*
Exploring Arduino - Code Listing 6-7: Processing Code to Read Data and Change Color on the Screen
http://www.exploringarduino.com/content/ch6

Copyright 2013 Jeremy Blum ( http://www.jeremyblum.com )
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License v3 as published by
the Free Software Foundation.
*/

//Processing Sketch to Read Value and Change Color on the Screen

//Import and initialize serial port library
import processing.serial.*;
import java.lang.Math;
import java.awt.AWTException;
import java.awt.Robot;
import java.awt.event.InputEvent;
Serial port;

String data = " ";
String[] values;
Robot rob;



void setup()
{
  try{
      rob = new Robot();
  } catch (AWTException e){
    e.printStackTrace();
  }
  port = new Serial(this, "/dev/ttyACM0", 9600); //Set up serial
  port.bufferUntil('\n');                //Set up port to read until newline
}

void draw()
{
  values = data.split(",");
  if(int(values[2]) == 1)
  {
    rob.mousePress(InputEvent.BUTTON1_MASK);
  }  
  
}
 
void serialEvent (Serial port)
{
  try{
      data = port.readStringUntil('\n'); //Gets val
  }catch(RuntimeException e) {
  }
}