Polynomial fits not working in Colorimeter-v05
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@Will-Dickson ... we had a discussion about this in the "Additional tests for colorimeter..." thread and I think I was able to get polynomial fits to work in May-June of 2017 after you packaged v05. But now @maddiehankard and our group at St Thomas have created another pH curve that we are playing with and v05 will only let us use a linear fit (not even a second or third order polynomial... and we need 4th order). Our x-y data are below.
# 2018-04-11 Hankard, Wolf, University of St.Thomas # Colorimeter Data # LED white # ----------------------------- # pH | Absorbance 4.74 0.26 5.45 0.21 5.69 0.22 6.36 0.25 7.00 0.34 7.43 0.44 8.16 0.55 9.17 0.62 -
@fisherba Thanks - I will have look this weekend.
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@Will-Dickson Oh, silly us! The curve makes a u-shape, so we needed to drop the pH 4.74 value. Now the polynomial fitting works.
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Yes, I think that would be the issue. I'm glad you were able to get everything working.