Well, with class coming up, and myself being quite into eve, i was wondering how difficult it'd be to build a wee project box that, when a switch is flicked can vibrate every - say - 5 minute, until the switch is returned. That way, i can pay attention, and only look over when it vibrates to can some ore. Would something such as Switch -> Timer Chip - Batteries (+/- lead) - Small Motor -> Switch work, so the ground line is dead when the switch is off?
a quick google search came out with this http://www.diy-electronic-projects.com/p287-5-to-30-Minute-Timer you can put hook up all sort of things to the output though caution must be taken when mixing motors with sensitive microelectronics.
