It is sensing an interference pattern of light. Gets brighter and darker pending the line up distance.

Interestingly, as it is unique, the signal reverses its shape when the target reverses direction.

But it will vary in frequency as it is measuring a real time object. From almost DC to the IC's skew rate.

So that presents challenges, naturally.

But at least this type of device is glorified around micro motion, so digital analysis is easily up to speed.

I suppose it would be wise to just use the Arduino and program the filter. It would give me many options.



Thanks everyone, I have a lot to research so far.