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LEDWIZ wiring question

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stalemate:


--- Quote from: mgb on December 15, 2011, 08:56:13 am ---You don't need to add resistors to those Ggg rgb leds. You should however use external power, not the usb power.

--- End quote ---
Is the USB power not strong enough or what is the deal?

mgb:

Current draw is the problem. You can only get so much current from the power on the usb bus. According to the ledwiz cut sheet, its about 500ma I believe.

stalemate:


--- Quote from: mgb on December 15, 2011, 05:39:59 pm ---Current draw is the problem. You can only get so much current from the power on the usb bus. According to the ledwiz cut sheet, its about 500ma I believe.

--- End quote ---
What if I have both of my LED-wiz units connected to a powered USB hub. Would that help?

I have 8 buttons per player which should use 60ma per button (20ma x 3) so I think my total current draw per player would be 480ma. I wasn't sure if the 500ma referenced on the LED-wiz cut sheet was in reference to a single LED-wiz unit or to the USB bus overall.

BobA:

Depends on your powered hub.  Check the wall wart that comes with it to see how much current it can supply at 5VDC.    Many 4 or 5 port USB adapters supply less than 1 amp at 5V and therefore greatly under power the bus.

stalemate:

I actually have an old 5v dc wall wart that I don't even know what it originally went with. It will do 2.5 amps, so I guess I could just use that directly. Would I need an inline fuse on the connection from the wall wart to the led wiz devices?

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