🚀 go-pugleaf

I need the LED to come on when the message on the screen says "It is safe to
turn off the system" or whatever it says.  The system won't have a monitor,
so that's why it will be necessary for an LED to come on, so the technician
will know that it's safe to pull the board.
You see, there will be a switch on the board, that when activated will start
the shutdown process (via software).  However, without this LED we won't
know when the system is fully shutdown.

Charles
CWILLS@juno.com


> How about a transistor hooked up to a capacitor controlling an LED.
> When the capacitor drains past the point where the transistor can hold
> the LED off, then the LED comes on via a small battery. If you put a
> resistor in line with the power supply and the capacitor, then the LED
> will not go off until the capacitor is charged enough, thus providing
> an indication that the board is powered up enough to allow other stuff
> to be manually turned on.
>
> Add a micro-switch to sense when the board is inserted (between the
> battery and the LED), and the control is complete.
>
> To get fancy use a bi-polar LED (red and green) providing green that
> the battery has power, and red that the motherboard is in an uncertain
> state.
>
> Wojtek Bok                       "My                  WORD"
> Byte Of Software Systems Inc.    "Programmers don't   BYTE"
> http://www.bossi.com             "They just         NIBBLE"
> wojtek at bossi dot com          "A                    BIT"
>