bmp180

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Using Casio calculator's formula for pressure-to-altitude conversion https://keisan.casio.com/exec/system/1224585971 It takes into account of the current temperature as well.

t2o2

Alternating available bus

1

Changes: * added check for available SMBus2 - if yes use it * added possibility to use with another bus as soon as on Raspberry it is possible to use...

katurov