hi Luis,or you could try firmata (http://www.firmata.org/). the idea is that you upload the firmata firmware to the arduino, and everything is controlled from the host program rather than writing software for the microcontroller. the protocol is well documented, there are implementations for many languages, but unfortunately there's nothing for racket/scheme as far as i know. it would be a great task to write one, so we could use arduino from fluxus and racket.
best, gabor
