paul- wrote: > Unless your running a Zero, the USB port is likely not going to put out > enough to power the pi properly. You could use the 5 volt from the > USB to power a small relay, then run the normal wallwart power through > the relay. Many different ways to do it. Yes this Is a Simply solution that i can do Just now. The question Is: Is there a more elegant solution, by using gpio, to Power on and off exploting the 5v obtained from the amplifier USB? For example, to Power off, i can writer a script that every x times (in cron) examine a specific gpio PIN ti do a "sudo halt". But to Power on?
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