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How best to get 5v power for push button lamp?

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misbehavens:

Hi Andy,

Sorry if the USB info was incorrect, I was only quoting Wikipedia (which is not always accurate). I would assume you are quite knowledgable on the subject of USB power as well as the I-PAC VE. Can you confirm or deny that the I-PAC has a jumper suitable for powering this lighted button or if I should get 5v from the other USB port? I don't know much about electricity and current, so my fear is that I will draw too much power and damage either the IPAC or computer.

I'm looking for the quickest, cheapest, easiest solution since I only have this one lighted button to worry about. The 12v "wall wart" doesn't make sense to me because I only need 5v and at 100mA. Seems like so much power would damage my lighted button, but maybe I am misunderstanding the physics behind all of this.

AndyWarne:


--- Quote from: misbehavens on April 14, 2012, 03:02:19 am ---Hi Andy,

Sorry if the USB info was incorrect, I was only quoting Wikipedia (which is not always accurate). I would assume you are quite knowledgable on the subject of USB power as well as the I-PAC VE. Can you confirm or deny that the I-PAC has a jumper suitable for powering this lighted button or if I should get 5v from the other USB port? I don't know much about electricity and current, so my fear is that I will draw too much power and damage either the IPAC or computer.

I'm looking for the quickest, cheapest, easiest solution since I only have this one lighted button to worry about. The 12v "wall wart" doesn't make sense to me because I only need 5v and at 100mA. Seems like so much power would damage my lighted button, but maybe I am misunderstanding the physics behind all of this.

--- End quote ---

No need to apologise, it was Wiki which is incorrect! Yes you could easily power that from the header on the I-PAC.

Andy

Heretik:

For anyone who may search this topic in the future:

You can grab any new/spare ATX power supply and find the main supply plug (for the motherboard header), it usually has 20-24+ pins on one header. First thing you'll want to do is jumper the GREEN to BLACK. This will signal the power supply that it is, indeed connected to a load. Then find any of the supplied 4-pin molex connectors:

RED = 5V
YELLOW = 12V
BLACK = Ground



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