Green Energy Saving option 5Vdc PIO trigger for Amp Power

I’d like to see a 5V pio trigger for the PI to turn off and on the Power Amp.

The relays are commonly available. The Volumio software needs to be aware

no audio output for the last X-minutes (user selectable) at which point, it
triggers the 0VDC on the a PIO pin to turn off the amp. If Volumio start playing audio,
the trigger should put 5VDC on the PIO pin to turn on the amp.

You can try the 12V if 5V is not working.

This means you have a amp with just an on/off switch? (No standby mode)
There is already a plugin “GPIO Buttons” that will detect play and Pause and could trigger your AMP.
only in your case if you want to go this way, make sure to use a relay with an adjustable timers (for on/off). So you can set the off function to the time you need, like 1 minute.
When pressing play relay comes on, press play/pause relay comes of after one minute.

And make sure your amp can deal with this. I’ve seen blown AMP’s caused by unbalanced switching of the NULL and Phase.