This zip file contains a test program for the rotary encoder used in EE109
projects.  To use the program with a Mac you should only have to do "make test"
to download it.  For Windows you may have modify the "PROGRAMMER" line near the
top to match whichever COM port your system is using for connecting to the
Arduino, and then do the "make test".

When the program runs, the splash screens shows which I/O port is used for the
encoder, and the state of the two inputs (A and B) and which of the four states
the encoder is in.  In the lower right corner of the LCD is a count value that
can be changed by rotating the encoder.

Assuming the encoder is operating correctly, and is wired as specified,
rotating the encoder should increment or decrement the count value on the LCD.
