Grounding with different voltages?

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Posted by rmfx on January 06, 2002 at 06:10:14:

I'm making an illuminated control panel using all microswitch pushbuttons from Happ. I've put super-bright LEDs inside the hollow cavity of the buttons, and everything looks great. What I'd like to do is use the normally-closed pole of the switches to cause the LED to turn off when the button is pushed (by cutting power to the LED), or even turn on a different colored LED while being held down.

My question is, since I am using an IPac, and LEDs will have to be powered by an external 5v source (an AC adaptor or the PC power supply) can I just use the same ground that runs from the switches to the IPac, or do I need to run another ground back to the power supply?

Thanks

Follow Ups:

Re: Grounding with different voltages? aramis 10:25:00 01/06/02 (0)
Re: Grounding with different voltages? aramis 10:10:59 01/06/02 (1)

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: I'm making an illuminated control panel using all microswitch pushbuttons from Happ. I've put super-bright LEDs inside the hollow cavity of the buttons, and everything looks great. What I'd like to do is use the normally-closed pole of the switches to cause the LED to turn off when the button is pushed (by cutting power to the LED), or even turn on a different colored LED while being held down. : My question is, since I am using an IPac, and LEDs will have to be powered by an external 5v source (an AC adaptor or the PC power supply) can I just use the same ground that runs from the switches to the IPac, or do I need to run another ground back to the power supply? : Thanks

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