Artemis Global Tracker Radio Board (Ding and Dent)

This is an early version of the Artemis Global Tracker Radio Board. It works, but it has limitations...:

* We routed the RFM97CW Reset and DIO pins through the TCA9534 I2C GPIO expander, to save on pin count

* This makes it tricky to use it directly with the Arduino RadioLib Library

* We forgot to include a MOSFET power switch for the microSD card

* This makes it tricky to minimize the current draw

If you're happy with those limitations, grab yourself a bargain! Ding and Dent! We won't be making any more of this version of the radio board. When they're gone, they're gone!

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