Greg Erskine wrote: 
> Hi Erik Sjödin,
> 
> Here's some information to ponder. This is not a complete solution but I
> think there is enough info to proceed with your project.
> 
> regards
> Greg

I have now looked in to the provided scripts(Button.sh). 

So for every GPIO in needed, if "exported" and direction defined:
echo "$PIN" > /sys/class/gpio/export
echo "in" > /sys/class/gpio/gpio$PIN/direction

Is it then safe to assume that the value in
/sys/class/gpio/gpio$PIN/value will be automatically changed (0 or 1) if
button is pushed or released depending on the direction, if wired
correctly?

In the amp_relay.sh it seems like the /sys/class/gpio/gpio$PIN/value is
manually changed by echo either 0 or 1 depending on the presense of a
media streams artist tag or not. I assume if the value if toggled to
on/1 the rasberry will start to apply power to AMP over its GPIO pin?

BR
Erik


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