As a child I built such a switching device out of a Philips electronics teaching kit. Don't remember the circuit, but sure the kit did not contain microprocessors basck then...
Once there were solenoids with push-pin and male shutter threading. At least my gives quite a bang, so use a long extension cable release inbetween (in case you could even get the latter...)
What about activating a cable release by an electrical motor and an excenter-wheel?
Last edited by AgX; 10-31-2011 at 12:47 PM. Click to view previous post history.