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OPT3101EVM: Running the OPT3101 uncalibrated

Robert Poor1
Prodigy 180 points
Part Number: OPT3101EVM
Other Parts Discussed in Thread: OPT3101

Consider this a fun - if only slightly oddball - question.

If the OPT3101 is being used as a gestural user input device (i.e. waving your hand), is calibration necessary?

The analogy is a mouse input.  You don't really care about absolute position since the user is part of the feedback loop, and the user will adjust hand motion to get the desired results.

So if I were to use the OPT3101 as a "one dimensional mouse":

  • Would I need calibration? 
  • Would skipping the calibration step allow a higher update rate?  (Is the current code limited by the time it takes to run the calibration algorithm?)
  • What would I lose without calibration?

Not crucial, but curious.  Thanks!

  • +1
    TI__Prodigy 330 points

    Let me answer these questions as best i can.. 

    • Would I need calibration? 

    If you are looking for pure differential information calibration may not be necessary. The only caveat being able to take out crosstalk (which again can be considered as DC and will not show up in differential information like hand waving) 

    • Would skipping the calibration step allow a higher update rate?  (Is the current code limited by the time it takes to run the calibration algorithm?)

    Calibration algorithm does not limit the device rate. It would simplify the device adoption and production process. 

    • What would I lose without calibration?

    The residue crosstalk will impact  absolute accuracy, temperature dependency on distance, a small ambient dependency of distance would what would be the effect if uncalibrated. Again if differential information is only desired then these would be slow enough to be not showing up against hand waving etc. 

  • 0 in reply to Karthik Rajagopal
    Prodigy 180 points

    Sounds like that will do what we need -- many thanks!