Please direct all attention to vicktor/FreeStyleLibre-NFC-Reader
Obviously all are welcome to use what's here but be aware it might be significantly behind the upstream master, so it's not the upstream authors' responsibility to help with this old branch. I'll probably abandon this fork and start again if I ever get a new enough Android phone start working on this again.
One notable and unfinished difference (which I should probably form into a pull request) was the conversion to SI units (mmol/l, rather than mg/dl commonly used in the US). This conversion is based on the molecular weight of glucose and is an approximation of 10/180 just as explained in https://en.wikipedia.org/wiki/Blood_sugar#Units. My working was something like:
Using the "quoted" molecular mass of glucose: 180 (g/mol effectively)
so, moles in 1g of glucose: 1(g) / 180(g/mol) = 0.0055555555[5... recurring] mol/g
so mmol/mg of glucose will be the same, 0.00555555556 mmol/mg approx.
1 mg/l = 0.00555555556 mmol/l
so 1 mg/dl = 10 x 0.00555555556 = 0.0555555556 mmol/l (approx. 10/180)
My working used the rounded value of 180 I see stated elsewhere, but I decided to take it back a step further:
Molecular mass of glucose: 6 x 12.011 (C) + 12 x 1.00794 (H) + 6 x 15.999 (O)
= 180.15528 (g/mol effectively) ...
so 10/180.15528 = 0.055507670938 mmol/l
I then rounded this to 0.05551. I don't presume to know why 180 is used more commonly than the "precise" figure but given that for any life-sustaining blood reading the difference will always be less than 0.2mmol/l I wasn't too concerned -- I just wanted to use a figure I'd derived myself.
Furthermore, I certainly don't know what values multi-market meter devices use internally to "convert" between results and I wonder if any blood glucose monitoring measures pure C₆H₁₂O₆ or if it's always more complex than that.... Anyway, though it's the least of anyone's concerns with regard to precision or accuracy it's only fair I mention the 'unusual' number.
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Read data from a FreeStyleLibre with Android
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