Thanks. I'd already found Arduino and it's various incanations plus add
on "shields" and accessories, Probably have eight or nine on my desk
right now and two or three in pieces that use them

http://web.hypersurf.com/~charlie2/T...rduinoTOC.html

Here are the first three pieces I did that use the Arduino to add
"behaviors"
to pieces - sensors, LEDs and small speakers and buzzers

http://web.hypersurf.com/~charlie2/T...eSisters1.html

Each Sister page has a link to a YouTube video - with sound - of the
piece
"behaving".