I think you need to increase the resolution to increase the accuracy of the pulse read before 1 minute is up.
Why deal with 36 pulses per minute ? I don't know how you are breaking the IR beam but maybe you could add extra pulses using extra beam breaks.
1 pulse per revolution of conveyer "drum" wheel could be multiplied up to 10 pulses per revolution or whatever using more beam breaks on the "drum" ? Easier to read a RPM during the one minute period.
Just thoughts.![]()
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