Hi guys,
there is another topic open rgd. porting a DMX library to Spark:
The hardware to create a (not-isolated) DMX-Port is quite simple. The isolation can be done by some optocoupler, but as we're using isolated AC/DC power-supplies and WiFi it would be safe to build a non-isolated DMX-interface.
If you still want to connect your core to other peripherals or a computer I'd higly recommend to implement a isolated interface.
regards