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timing circuit for physics experiment

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chingyg

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I am busy on a physics project, basically I have two switches that are normally closed. The experiment will cause the first switch to open, followed by the second one. I need to time the interval between the opening of the two switches.

I am thinking about a 555 timer clocking into a binary counter, would it work? or is there a easier method?
 
oh ya i forgot to mention that, it is about 300ms to 1s, depending
What accuracy and resolution? 1mS?...10mS?...0.1S? I've hacked stopwatches to get a cheap start-stop timers.

Ken
 
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What accuracy and resolution? 1mS?...10mS?...0.1S? I've hacked stopwatches to get a cheap start-stop timers.

Ken

the more accurate the better, umm its a project to measure gravitational acceleration, so a 50ms resolution would be the best. and if i could use a counter the project would be more impressive, since the funds are not limited
 
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