Well, I've gotten my tilt sensor samples from Fredericks. They look so cool, and the circuits to use them look so simple. An oscillator to give it some AC then an anolog to digital converter to give me PWM and then into the computer as hexidecimal value. No worries about it knowing which way is up. Fredericks even sells a board for it that puts out PWM for $100. I don't need perfect accuracy, so I believe I might be able to do something cheaper. Electroken, can you recommend some basic electronics books for building oscillator circuits? I really want, "The Art of Electronics" by Horowitz and Hill, but it's way too expensive. Know where I can get a used copy cheap? Sorry Ian, I want to support authors, but for a hobby, I can't pay $70 for a book. I already spend over a thousand dollars a year on medical textbooks.