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A linear pot would be ideal, and as I understand it, is what they use for telemetry on factory team race bikes. But I was looking at prices and they are in the several hundred dollar range.
I am trying to figure out something that could do the same thing for less that I could use on my bike and maybe package and sell to other amateur motorcyclists who would like to start messing around with telemetry for less of an initial investment.
For my purpose +/- 1mm would likely be fine.
A sample rate of 45ms is slower than I would like. Some quick napkin calculations say that the wheel is making one revolution every 20ms if you are going 200mph which is the upper limit of what I would be interested in. I would ideally like 4 samples per revolution at a minimum, so managing to sample at 5ms would be ideal.
I am trying to find prices on CMOS line sensors but am having a hard time. I have found several product descriptions but cant seem to find any retailers for them. That seems like it would potentially be a good solution.
Luckily for me, I live next door to some mechanical engineering students who are always up for a challenge.
I know I have seen some Gray encoders online in the past, but if you have a template handy that would be great.
I should have asked this in my first reply . . . why do you want to measure the position of the front suspension on a motorcycle?
Another thought that just pops up...Hacking a digital caliper might be another option, although at least some of them won't accept high speed movement, but I have a carbon fiber caliper that takes quite a bit of knocking (yes knocking) back and forth to confuse it and that would give you 150mm of movement with either 0.1mm or 0.01mm resolution.I have no idea of how fast it can be read out though.