Ispindel - Polynomial Formula

Discussion in 'General Brewing Discussions' started by craig12345, Oct 24, 2020.

  1. craig12345

    craig12345 New Member

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    Hi all,
    I'm having issues with my Ispindel incorrectley registering gravity.

    I think it's likely to do with the polynomial formula buit I'm not sure.

    I went through the whole calibration process (twice) but I'm thinking the way I've entered the fomula into the Ispindel may be incorrect, I've entered it with and without spaces but it doesn't seem to make any difference.

    The formula I'm useing is this: 0.8664121875066527 + 0.009562713003442422 *tilt-0.00018408281752418392 *tilt*tilt + 0.0000013556331354515971 *tilt*tilt*tilt

    I've tried with and without spaces to no avail.

    For my current batch of beer that I pitched yesterday the tilt reported to BF correlates with what I would expect the SG to be recorded as (1.056) so that looks OK to me.

    Hopefully the following link is accessable but this is my current brew session with the SG being reported at a fairly constant 0.873: https://www.brewersfriend.com/homebrew/brewsession/361878

    Any help much appreacited!
     
  2. Yooper

    Yooper Administrator
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    I don't have an iSpindel, so I'll send this over to the developer but in the meantime if you want to check the step-by-step instructions we have here: https://docs.brewersfriend.com/devices/ispindel to make sure something isn't missed that may help!
     
  3. avantassel

    avantassel Moderator
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    Hi Craig,

    First off I want to make sure you are using the correct URL. There is one for Plato and one for Gravity. The gravity URL ends with _sg and is https://log.brewersfriend.com/ispindel_sg/[API KEY]

    As for the calibration, I would refer you to this page which has a calibration tool also.
    https://github.com/universam1/iSpindel/blob/master/docs/Calibration_en.md
     

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