USB momentary switch power on/off for rpi

[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.

When i get it working i would like "ladyada" to maybe make/produce them so everyone can enjoy this "Pi-Power-USB-Stick"! (ladyada contact me!! : ) )

[adafruit_support_bill]

Sounds like a nice project. Got pictures?

[mano1979]

I do...
Allthough this is all i got for the moment. I am waiting for my components to arrive.

The pcb usb stick layout in eagle

IMG_1375.JPG (128.19 KiB) Viewed 784 times

[mano1979]

Is someone known with the V-USB library for avr?
I could really use some help with coding....