Another great Raspberry Pi project from the Adafruit Forums. From community member mano1979:

I have designed a usb-stick with a momentary switch that can switch power on the raspberry pi.
This includes system shutdown!! all through USB. it is not bigger than a normal flash drive but contains a lot of stuff.

So when the button is pressed, the power turns on. When pressed again, the usb stick sends a signal to the Raspberry-Pi to shutdown/halt the system. when the system i halted, the RPI send a signal back to the usb stick wich will turn the power off (with a little delay).

Now what i still need is the ability to light up the keyboard leds at the very moment that the system is halted. or at least before the system and USB stops functioning.

I found a little python script that can light up the keyboard leds. Called Python-keyboardleds.
i just need something, to do that at the very last moment before shutdown so the power can be turned off. Any help is welcome, since i am not really familiar with this sort of stuff.

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Head on over to the forums and offer mano1979 some tips to complete his project!

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