Support for power button

[fedormil]

"On the HiFiBerry Digi+ Pro GPIOs 5 and 6 are also use and cannot be used for anything else."

"1-2. Connect the wires with GPIO pin 5 & 6."

So my I use GPIOs 5 and 6 for resetting with HiFiBerry Digi+ Pro?

I have a HiFiBerry Digi+ Pro and a HiFiBerry DAC+ Pro, both with Off-buttons on RPi3B+.

I did quite a lot of research (I thought, anyway) before going for a solution where I soldered three wires to the same pins (11, 8, ground-6) on each HiFiBerry board. This gave me illuminated Off-buttons that go dark when a Python script has been completed and it's safe to disconnect power. 

In practical use, this has proven near-perfect for me, as all other aspects of daily music playback are managed from an app on iPhone or iPad. 

The only thing I did not accomplish, was waking up the RPis with a button (the same) because the pin in question (5) is already in use by the I2S interface to the HiFiBerry cards. When I tried it, the RPis would boot as expected but the HiFiBerry cards were left unresponsive (until a complete power disconnect). 

As I use a linear PSU that continously dissipates the energy not used by RPi/HiFiBerry, my habit is to shut down the PSU separately anyway. If you plan to use a PSU with a separate power switch, you may perhaps be happy with a similar setup.

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