/**
 * Simple Read
 * 
 * Read data from the serial port and change the color of a rectangle
 * when a switch connected to a Wiring or Arduino board is pressed and released.
 * This example works with the Wiring / Arduino program that follows below.
 */


import processing.serial.*;

String portname = "/dev/tty.usbserial-A4001qa8";  // or "COM8"
Serial port;  // Create object from Serial class

int val=100;  // Data received from the serial port, with an initial value

void setup() 
{
  size(400, 400);
  
  colorMode(HSB, 255);
  ellipseMode(CENTER);   // draw from center out
  noStroke();
  frameRate(30);
  smooth();

  // Open the port the board is connected to
  port = new Serial(this, portname, 19200);
}

void draw()
{
  if (port.available() > 0) {  // If data is available,
    val = port.read();         // read it and store it in val
  }
  background(99);
  // Draw the shape
  fill(val,255,255);  // we're in HSB mode, so first value is color
  ellipse(width/2, height/2, 250,250);
}