I'm lame at electronics, but i want to build a device that would have either LCD or LED display with 3 (or more) digits. the counter would have a sensor that would increment the count by one each time a magnet passes in front of the sensor. It needs add and subtract capabilities (increment one or decrement one by pushing a up button or a down button.) It should run on AAA, AA or 9V battery. Where should I start to find a schematc, instructions or plans to build or buy such a thing? I used to have an exercise machine that did this, but can't seem to find such a thing on google. Probably not using the right buzz word. (':wink:') (help?)
TIA
TIA