This Kard is designed to allow isolated (ground triggered) inputs to the processor when the rail is 3-30 volts.

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==== Kard GPIO Pin to Rail Pin Map ====
^Kard GPIO Pin^Rail Pin^
|gpio 0|CxP0|
|gpio 1|CxP1|
|gpio 2|CxP2|
|gpio 3|CxP3|
|gpio 4|unmapped|