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Could I fry my LedWiz if I...

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Bobulus:

If I'm understanding Randy correctly, you want to put diodes at the two places I drew orange arrows, so that electricity can flow to the RGB-drive from either power source, but not away from the RGB drive to the other power source.

If you already hooked it up and the buttons worked, I'm probably totally wrong on the ground issue.

RandyT:


I'm not sure how you have the 5v connected to the LED-Wiz, but whether or not this is a "safe" configuration depends on whether there is a nice big diode on the output of both of the power supplies, and whether ground is being switched out when you switch from one supply to the other.  If ground is still connected, there is still the potential for current flow from one supply to the other, and possibly through the LED-Wiz as well.  Still, it would be a good idea to put diodes on the 5v lines to prevent current from flowing from one supply to the other, just in case they don't already have diodes on the outputs.

Obviously, this is an "unsupported" application, so I make no guarantees about any of it, one way or the other.  I just mentioned the diodes as a matter of "good practice" when trying to keep current where you want it and away from where you don't.

RandyT

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