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Unread 07-11-2004, 18:00
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Al Skierkiewicz Al Skierkiewicz is offline
Broadcast Eng/Chief Robot Inspector
AKA: Big Al WFFA 2005
FRC #0111 (WildStang)
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Re: building a hand held tachometer

Ben,
There are number of circuits out there if you search for them. It is possible to use a light sensor with a light source. Once you get that far you need to filter the signal to cancel out the noise and then send that to a counter. Add to that a semi accurate time base and all you need to do is to interface your results to a display of some sort. When you add up all that is needed, one of those tachometers in McMaster Carr looks pretty nice.
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Good Luck All. Learn something new, everyday!
Al
WB9UVJ
www.wildstang.org
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Storming the Tower since 1996.