add Adafruit pro trinket 3v board support

EnviroDIY / Arduino-SDI-12

An Arduino library for SDI-12 communication with a wide variety of environmental sensors. This library provides a general software solution, without requiring any additional hardware.

https://github.com/EnviroDIY/Arduino-SDI-12/wiki

BSD 3-Clause "New" or "Revised" License

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add Adafruit pro trinket 3v board support #69

Closed Foundouck closed 4 years ago

Foundouck commented 4 years ago

This work well but hardware watchdog and pin13 cannot be used on this board