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The Projects Forum Working on an electronics project and would like some suggestions, help or critiques? If you would like to comment or assist others with their projects, this is the place to do it.

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Old 02-16-2011, 06:36 PM
wayneh wayneh is offline
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Join Date: Sep 2010
Location: Roscoe, IL
Posts: 7,613

Light gate is fine, and probably even easier for a DIY project, since you can buy pre-made "gap" modules. An old VCR I recently took apart had some in it.

You may still have a noise issue, though. You'll want to modulate the beam and reject anything not coming into the receiver on the beam. That'll reject ambient noise. And you may need to have some sort of timer circuit to lock out switching for a brief period after one pulse has been detected, so that a slow pass doesn't turn into multiple triggers. The challenge will be to prevent multiple pulses while still allowing the meter to read to high rpm. I think it might work fine all by itself, but it's something to watch out for.
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