what are those two 5V and two GND pins for?
These "schematics" are *not* schematics. These as PCB files.
Quotewhat are those two 5V and two GND pins for?The board takes a 12v input and produces a 5v output, for the optocouplers: the relays / drivers / leds run off the 12v source.The 5v pins are routed out, to potentially power other peripherals.The inputs are "isolated" by the opto-couplers (active low) and you should have no problem driving them with a shift register: the "isolation" however shares the same 5v, according to the schematic.QuoteThese "schematics" are *not* schematics. These as PCB files.One of the files is a schematic for the board.
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