Just want ask confirmation that USB on Nano do not provide any power. I was trying to use a Widi USB device to receive midi info on the USB but the device do not power on at all (device works on other USBs).
That’s correct, the Nano won’t power anything.
Huge limit imho. Widi is just one of the many technology that can provide enhancement in real live scenario for Nano Cortex and the need of USB power, especially when using an external power adapter (not the USB itself).