So, carrying on. The proximity sensor will give me wildly varying RPM numbers varying in a random pattern from actual RPM to 1/2, 1/3, 1/4 etc of actual RPM, but never a readout greater than actual RPM.
Then I tried a Hall sensor. Again wildly varying RPM but of no discernible pattern. Running at 300 RPM I get readings varying from 1 to 30,000. This time a shielded cable.
I have played around with debounce levels, varying spacing for the sensor, etc but as far as I can tell nothing has made any difference in the readout pattern.
Does this sound like a hardware problem or a problem in my Mach3 settings? And if the problem might be in the settings, where should I start to look?
Thanks.