Lab 5 - Processing Labs

1. Oscillating Circle with Processing

• Processing is based on Java.
• A global variable is able to be referenced at any point in a program, whereas a local variable can only be referenced within the function in which it was declared (and will consequently disappear when the function ends)
• The draw() function returns a void data type.
• The code below the "//keep the circle in bounds" comment checks to see if the circle has gone to or past the top or bottom of the window. The variable y refers to the center of the circle, so y - (diameter/2) is the y-coordinate for the top of the circle, and y + (diameter/2) is the y-coordinate for the bottom of the circle, so when the top of the circle hits the top of the window (at y-coordinate zero) or when the bottom of the circle hits the bottom of the window (at y-coordinate "height"), the y-speed reverses.

2. Sending Serial Data from an Arduino Circuit to a Processing Application

3. Etch-A-Sketch

This circuit uses a potentiomenter and a photoresistor to create a 'sketch' through Processing.