JanUpdate 19.08.2018 – PCB is done
Just a quick shot of the near-final board (nothing routed yet):
The wasted space on the right will be used for one or two additional digital pins, so one could use sensors other than I2C. I finally decided to use CR1632 button cells (switched between them an CR1225 a few times) to get around two years of use out of them. That's because the combs are used around two years and I wanted to shrink tube the circuit so I can't easily replace the battery "in the field".Final size is: 25,3x18mm (1x0.71").
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