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A comment on Pilo: Raspberry Pi-Powered Lights-Out Remote Server Management. Parent comment

Re:Pilo: Raspberry Pi-Powered Lights-Out Remote Server Manag... by flotwig on Saturday August 22, 2020 @02:56PM (#24246329)
Looks like it's not supported on the Nano, Trinket, or Uno, which were the only devices I had laying around: https://arduino.stackexchange.com/a/39638

Otherwise, that would work fine, but not all motherboards support power-on via USB HID, most support PS/2 though.

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Re:Pilo: Raspberry Pi-Powered Lights-Out Remote Server Manag... by ThatPlayer on Sunday August 23, 2020 @03:19AM (#24250222)
You can do it on the Uno, if it's real (or close enough) Uno that uses an atmega16u2 for the USB connection. Using HoodLoader2 like that post mentions: https://github.com/NicoHood/HoodLoader2 .

Most Uno clones skip the atmega16u2 and use a cheap USB to serial adapter instead, which will not let you reprogram it as a USB HID

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Re:Pilo: Raspberry Pi-Powered Lights-Out Remote Server Manag... by rdc12 on Sunday August 23, 2020 @12:08AM (#24249437)
You could also hook up a GPIO pin to the wires for the power on button
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