PicoRuby: A Lightweight Ruby Implementation for Microcontrollers

PicoRuby is a lightweight mruby implementation with a small footprint: 256KB ROM and under 128KB RAM (32-bit architecture). Highly portable, it depends only on standard C libraries and supports microcontrollers like the Raspberry Pi Pico. Still under development, it provides API documentation, demo videos, and build tools. The `rake` command builds three executables: `picorbc` (compiles Ruby to mruby VM code), `picoruby` (executes Ruby code directly), and `r2p2` (for specific use). Developed by HASUMI Hitoshi and Monstarlab with funding from the Ruby Association.