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Trouble with LED button wiring
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ShadeValryn:

--- Quote from: PL1 on October 26, 2014, 01:13:06 am ---Here's one way to wire it so the LED turns off when the button is pushed.  That is the effect you're going for, right?

The five red dots are the 5 QD terminals (2 LED socket + 3 microswitch)



NOTE: This won't work with an x-arcade encoder which uses a series of isolated commons (not tied to ground) or a ZD encoder. (active high device)

Using a ground from another source works with KADE, Xin-Mo, and Mini-Pac -- tested/confirmed by shorting to ground from a different USB cable or computer PSU frame.

You can use the ground from the LED lighting harness since "ground is ground."

It should also work with an IPac, Keywiz and any other active-low encoder that uses a real ground.


Scott

--- End quote ---

Okay, I've wired it like this, and the ground is from the power supply ground so it can actually handle the voltage (grounding the buttons to the ipac results in tripping the overvolt protection).  Now my buttons all light up just fine, and turn off when pressed, but now whenever the button is pressed, the ground that is no longer there so the LED shuts off also is preventing the button from sending a signal to the ipac that "hey! i'm being pressed!".  Any thoughts?
PL1:

--- Quote from: ShadeValryn on October 28, 2014, 09:14:44 pm ---Okay, I've wired it like this, and the ground is from the power supply ground so it can actually handle the voltage (grounding the buttons to the ipac results in tripping the overvolt protection).  Now my buttons all light up just fine, and turn off when pressed, but now whenever the button is pressed, the ground that is no longer there so the LED shuts off also is preventing the button from sending a signal to the ipac that "hey! i'm being pressed!".  Any thoughts?

--- End quote ---
I think I've figured this out.

I was using a computer PSU molex where the ground is tied to the PSU case.

Your wall wart probably has a 2 prong plug so the ground is probably isolated.   :banghead:

Sorry I didn't think about that earlier.


Scott
ShadeValryn:

--- Quote from: PL1 on October 28, 2014, 11:40:30 pm ---
--- Quote from: ShadeValryn on October 28, 2014, 09:14:44 pm ---Okay, I've wired it like this, and the ground is from the power supply ground so it can actually handle the voltage (grounding the buttons to the ipac results in tripping the overvolt protection).  Now my buttons all light up just fine, and turn off when pressed, but now whenever the button is pressed, the ground that is no longer there so the LED shuts off also is preventing the button from sending a signal to the ipac that "hey! i'm being pressed!".  Any thoughts?

--- End quote ---
I think I've figured this out.

I was using a computer PSU molex where the ground is tied to the PSU case.

Your wall wart probably has a 2 prong plug so the ground is probably isolated.   :banghead:

Sorry I didn't think about that earlier.


Scott

--- End quote ---

So any advice as to what I could use for a constant ground that can handle the 12v led's ground? 
PL1:
If you are using a regualr computer PSU, why not use the 12v + ground (yellow and black) from the 4-pin molex or SATA power cable?
(use an extender/splitter cable if you don't want to cut the cable on the PSU)

 

If you're using a laptop with an unused HDD compartment, you can probably find an adapter/extender cable to tap into the SATA power connector.


Scott
ShadeValryn:

--- Quote from: PL1 on October 29, 2014, 08:10:10 pm ---If you are using a regualr computer PSU, why not use the 12v + ground (yellow and black) from the 4-pin molex or SATA power cable?
(use an extender/splitter cable if you don't want to cut the cable on the PSU)

 

If you're using a laptop with an unused HDD compartment, you can probably find an adapter/extender cable to tap into the SATA power connector.


Scott

--- End quote ---

Yeah... the thing is, i'm actually going to put a gigabyte brix pro into the control panel, effectively turning it into a portable arcade station.  Any other ideas on how to ground it?
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