The PocketBeagle is a tiny but powerful key-fob-sized open source Linux computer for $25. It has 44 digital I/O pins, 8 analog inputs, and supports multiple serial I/O protocols, making it very useful as a controller. In addition, its processor includes two 200-MHz microcontrollers that allow you to implement low-latency, real-time functions while still having the capabilities of a Linux system. This article discusses my experience trying out the PocketBeagle, with details of how to use its different features.

No networking though, neither ethernet nor wifi.