This is done to avoid transmission erros as described in
https://forum.mysensors.org/topic/10452/nrf24l01-communication-failure-root-cause-and-solution

The pin definitions are updated and the uart debug interface is removed
as it is not present on the actual board.

Currently the data values are written to the debug output.

The firmware is developed using an aduino micro pro with an atmega32u4
as the hardware for the weather station is not ready yet.