Why not power your device from the upstream USB port and wire the downstream port’s power (where the web cam would plug in), to the external supply? Anything plugged into the downstream port requires the external power supply to be plugged in.
Why not power your device from the upstream USB port and wire the downstream port’s power (where the web cam would plug in), to the external supply? Anything plugged into the downstream port requires the external power supply to be plugged in.