A detailed tutorial published on HACKERNOON for building a portable lightning node using a USB armory board.
The Armory requires no power adapter or wall socket; it only needs a USB port to plug into to function. The Armory powers itself via USB and also communicates to its host device in the same manner — via an emulated Ethernet connection. The Armory utilizes the NXP i.MX53 ARM® Cortex™-A8 processor running at 800 Mhz. It also includes 512 MB of DDR3 RAM and a microSD card slot for storage.