http://www.hackaday.com/entry/1234000520028239/
With that guide, you should be able to hook a 9V battery up to your USB port and provide power for the attached devices. This would work best if you hooked the simple circuit up internally so that anything plugged into your GP32 can get power - this is useful for running USB devices in Linux.
With that guide, you should be able to hook a 9V battery up to your USB port and provide power for the attached devices. This would work best if you hooked the simple circuit up internally so that anything plugged into your GP32 can get power - this is useful for running USB devices in Linux.