Temp spike battery improvements

[h3ss]

I finally managed to capture readings from an entire discharge cycle of a TempSpike battery. The battery reading sent by the device appears to be a reading in millivolts, and the discharge cycle is a non-linear function as you would expect in that situation.

To create a more accurate mapping of voltage to battery percentage, I used some machine learning to optimize a function in the form A*tanh(B*x+C)+D where A->D are variables that were optimized with TensorFlow. (I chose that function format simply because I noticed that the curve from the readings looked fairly similar to a tanh curve). This yielded a function whose output fit within about 1.8% of the actual data collected, which I think is good enough ;)

I also added clamping for both minimum and maximum values, just in case.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (19c07bf) 81.96% compared to head (7f9a985) 85.24%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
+ Coverage   81.96%   85.24%   +3.27%     
==========================================
  Files           2        2              
  Lines          61       61              
  Branches        8        7       -1     
==========================================
+ Hits           50       52       +2     
+ Misses          5        4       -1     
+ Partials        6        5       -1     

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[h3ss]

Battery curve comparison:

• Blue line are device readings
• Orange line is the predicted value

[bdraco]

Thanks. Release will publish shortly

[bdraco]

I'm not at my desk, so it'd be great if you could take care of bumping library in HA as well

[bdraco]

I forgot to fix the commit message name so the release failed, I'll have to wait till I get back to my desk to do it manually

[bdraco]

all sorted https://github.com/Bluetooth-Devices/thermopro-ble/releases/tag/v0.9.0 published

[h3ss]

Thank you very much @bdraco !

I'm not at my desk, so it'd be great if you could take care of bumping library in HA as well

I went ahead and submitted this. My first time doing a PR to that repo so hope I got it right :)