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Do a search for Frequency Counting, and you will find a great example that Bruce did for someone using Darrel Taylor's Instant Interrupts to trigger on a rising edge, and then trigger again later on the falling edge. I think you can easily modify it for your project, and by using interrupts you'll free up a lot of microprocessor time.
Good Luck!
Jerry.
If your oscilloscope costs more than your car...
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Thank you I will look into it.
Toby
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Which method you choose depends a lot on how fast those pulses are coming in. What is the maximum RPM of the shafts you are trying to measure the speed of?
Charles Linquist
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3000 hz would be the absolute fastest.
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