3 ms·

Thanks, looked at them. Can't get the resolution we need for any vaguely feasible price though.

• DavidPeiffer 6y ago
  Brainstorm here - could you put a number of lower resolution encoders firmly on the same shaft? The theory would be they'll all pulse on slightly different but consistent phases. Simple example, an encoder is capable of 60 degree resolution. I'll mount 5 of these which will all have some variation in phase, and I'd average out to having 12 degree resolution, with variation that could be modeled statistically. Conceptually I would have a shaft with n different key slots, one per encoder. This would ensure there will be variation as opposed to having the phase be super similar, such as +/-1 degree in the above low resolution example.
  • hazeii 6y ago
    Interesting, but I think we're run out of space. Sort of related, we've been considering how we can gut an optical mouse and use the sensor from them. The idea is broadly similar, basically learn the pattern around one revolution and work out where we are in it.
    • DavidPeiffer 6y ago
      Do you need the data in real time, or can you complete a biking session then process the data?
      • hazeii 6y ago
        Real-time, in fact we're acquiring data at quite a high rate and boiling it down with a view to presenting the results to the rider a few times a second. You can see more at https://bodyrocket.cc https://bodyrocket.cc if you're interested!