Assignment 10.2

posted Aug 1, 2010, 10:44 AM by Unknown user
Move your mouse to the right in the processing sketch, the LED gets bright. Move it to the left, it gets darker. Genius.
Also the background in processing gets brighter and darker along with the LED. I thought that was fun.


import processing.serial.*;  //import all serial libraries
Serial serPort;              // Create object from Serial class
void setup() {
  size(600, 150);
  serPort = new Serial(this, Serial.list()[0], 9600);
void draw() {
  int briteness = int(map(mouseX, 0, 600, 0, 255));  //set variable relative to mouse X
  serPort.write(briteness);                          //write value to serial
  background(0, briteness, 0);                       //set background green to value
  delay(50);                                //delay 50 ms so arduino can catch up


const int led1 = 9;
int brightness;

void setup() {

void loop() {
  if (Serial.available() > 0) {  //check if serial isn't empty
    brightness =;  //set varible to last byte in serial
    analogWrite(led1, brightness);  //write value to LED