faker_
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Turn off LEDs?

Fri Jun 01, 2012 8:52 am

I was wondering if it is possible to turn off the status LEDs on the Pi during operation?
I understand they are important during startup and when debugging problems.
So I'm not looking for a permanent solution, just for the currently running session would be perfect.

I want to run my Pi 24x7, the LEDs will only consume power and light up my place (didn't expect them to be this bright to be honest!).

Is it possible?

strawberrytau
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Re: Turn off LEDs?

Fri Jun 01, 2012 9:10 am

Good question! I expect this must be possible. But does anyone know how?

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nick.mccloud
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Re: Turn off LEDs?

Fri Jun 01, 2012 11:09 am

Hack the kernel or one of the Pi particular modules - that's what turns them on & off.

https://github.com/raspberrypi

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SN
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Re: Turn off LEDs?

Fri Jun 01, 2012 11:13 am

I quite like the leds - the give my paper-box-cased raspi an eerie glow in the dark ... ;-)
Steve N – binatone mk4->intellivision->zx81->spectrum->cbm64->cpc6128->520stfm->pc->raspi ?

faker_
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Re: Turn off LEDs?

Fri Jun 01, 2012 11:29 am

nick.mccloud wrote:Hack the kernel or one of the Pi particular modules - that's what turns them on & off.
Is this also true for the power LED?

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nick.mccloud
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Re: Turn off LEDs?

Fri Jun 01, 2012 12:42 pm

faker_ wrote:
nick.mccloud wrote:Hack the kernel or one of the Pi particular modules - that's what turns them on & off.
Is this also true for the power LED?
No, that's hard wired to 3.3v:

http://www.raspberrypi.org/wp-content/u ... s-R1.0.pdf

faker_
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Re: Turn off LEDs?

Fri Jun 01, 2012 1:00 pm

nick.mccloud wrote:
faker_ wrote:
nick.mccloud wrote:Hack the kernel or one of the Pi particular modules - that's what turns them on & off.
Is this also true for the power LED?
No, that's hard wired to 3.3v:

http://www.raspberrypi.org/wp-content/u ... s-R1.0.pdf
Thanks, that's what I expected.
I think some black tape will be the best option for me then ;)

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c_imust
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Re: Turn off LEDs?

Mon Jun 04, 2012 12:42 am

take off them using electric iron :D

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rew
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Re: Turn off LEDs?

Mon Jun 04, 2012 6:56 am

I'm guessing c_imust is not a native english speaker. I'm guessing he meant "soldering iron".

Whenever I get a chance, I'd take off "R34" and solder on a 4k7k resistor. That should reduce the light from the red powerled significantly.

Note that it is currently running at about 3.2mA, so that's the most you're going to save.

Pete, if you're redesigning the PCB, I'd appreciate it if you could make R34 and R35 (and friends) mount on bigger pads. Or maybe design a 0805 resistor R34a parallel to R34 and then mark that "do not mount". I can then remove R34 and mount a bigger resistor on the bigger pads, or on the R34a pads.

I think I'd be able do solder on a 0402 resistor like there is on there now, but I simply don't stock them because they are too small for me for normal operations....

Other option: Make a six-pad "connector". All five kathodes connect to the pads, as well as the 3.3V. Now if you remove the resistors (or leds), you can wire up external leds if you want.
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