Info about GPIO buttons, official Touchscreen and IQAudio Dac+

Hi all,

I’ve been playing around with adding GPIO push buttons to my Volumio step, and thought it might be useful reference for others. I’m running:

Raspi B+
IQAudio Dac+
Official 7" touchscreen

After much trial and error, the only GPIO pins that I could get to work were 4, 5, 6, 7 and 8, which I mapped to:

4 - Vol+
5 - Play/Pause
6 - Next
7 - Previous
8 - Vol-

Every other GPIO pin I tried - even those not utilised by the DAC or the touchscreen, either yielded no response or shorted something meaning there was no output on the music. I couldn’t find anything similar in the forums, so thought this might be a useful reference if anybody else is having the same issues I did!