Hi Guys, I'm working on a project that is supposed to encourage kids to ride a stationary bike for three minutes. The plan is to have the rider hit a button when they get on the bike and that sets a series of timers going each one triggering a light or embedded sound bit encouraging the kid and perhaps announcing how much time is left.
Here's the part I'm having trouble with. The bike needs to detect whether or not the kid is actually pedaling and it not reset itself. I was thinking a hall sensor or a proximity sensor (the type used in automation) or perhaps a reed switch mounted on the hub of the wheel with a small weight on the trigger that would depress once centrifugal force pushed it out.
In short, Kid gets on bike, hits start button, three minutes go by and bells and whistles sound. If the kid stops pedaling at any time he has to start over.
Any ideas? Simple if possible.