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The Arduino will be getting its power from the USB port that will be controlling it, wouldn't it? Then all that is needed if using the MOS board would be to run the ground, Signal wires from the Arduino to the MOS board then the LED panel and 12v supply from the terminals. Is the 5v rail needed into the VCC of the MOS board? (not sure what this does) I guess so to turn the MOSFET on and off via the PWM? So the Arduino will only be drawing little current to pulse the signal. I doubt enough to damage anything on the MOS board, Arduino or the computer.
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