Connections are made from sensors and outputs to the FunKey Sensor board using these connectors.  The black ends connect to the pins on sensors and outputs.  The alligator ends connect to the holes on the board.  Red is for the "power" connection, Black is for the "ground" connection, and Yellow is for the input or output value.

Typical connections for inputs or outputs

Typical connection for an input and output pair.  Most inputs and outputs use all three connections, but some only use two, as shown in the input and output pages.