Arm® Zero Stem Development Board Adafruit Arm® Zero Stem Development Board (3945) is a tool designed to evaluate Pi Zero 1.3 and Pi Zero W 1.1. This PCB shim transforms Raspberry Pi Zero into a USB dongle that is used to share the computer's internet connection without messing with external adapters and cables. The Adafruit Arm Zero Stem Development Board features a USB connector and includes nylon bolts and nuts.