Well I've got an RPM reading finally but its VERY noisy, even when the gear is moving at a pretty constant RPM. It jumps between what it should be (around 40-50 RPM) to less than 10. A median filter helped a little but not much. I attached the lv project file, its probably very messy in terms of efficient coding... I borrowed the counting compared to time method from an example code that find frequency of a digital signal. I also attached a sample of the results in an excel file so you can see how noisy it is. It should remain close to the 40-50 mark once its spun up to speed.
Another problem I'm seeing is that the raw signal from the prox sensor drops a spike or two sometimes, but I'm not sure if thats a problem with the sensor or the NI hardware or software.
