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  • NathanJ63 commented on electro18's instructable Measure RPM - Optical Tachometer 8 months ago
    Measure RPM - Optical Tachometer

    I agree dividing by two put reading off by a factor of 2. There will still be some error because we can assume the first time it interrupts was not a full revolution and should be subtracted off but the time would need to be updated to account for this offset as well and millis() can't be called within RMPcount because it is an interrupt itself.

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