[Gllug] front panel light

[Dylan]

On Thursday 15 February 2007, Julian Somers wrote:
> An obscure question (yes, another one):
>
> I want to put LEDs on the front panels of some headless servers, that
> indicate when the server is booting. It would light up when you power up
> the box, and turn off once the box has reached the runlevel where user
> can log into the web interface. If I had such a thing, I might be able
> to stop people repeatedly turning on and off servers while they are
> fscking their big disks once a month -- a common cause of death.
>
> I imagine it might be possible to take 5v from a USB header on the
> motherboard to light up my 'wait' light, and then turn off this power
> from a script when runlevel 3 is reached.
>
> Does this sound feasible?

I'd build a simple normally-on TTL circuit powered from the mainboard power 
with the switch signal derived from a suitable port (does it have a parallel 
or serial port?) ...

>
> In other words: those little bendy lights on stalks that run from laptop
> USB ports: can you turn them off from the commandline?
>
> thanks,
>
> Julian


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