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PiFace Relay Plus
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PiFace Relay Plus (the base board) has four configurable inputs (X-port)
and four relays (each relay is connected in parallel with an LED).
`Extra Boards` offer additional functionality:

- *Relay Extra* board adds four more Relays and four more inputs.
- *Motor Extra* board adds two motor drivers capable of driving two motors
  each for control of up to four motors.
