RedBear Duo (now under


I’ve ported uLisp to RedBear Duo which uses Particle OS.

Support for uLisp on third-party boards

Nice work! If, like me, you weren’t familiar with this board, it’s based on an STMicroelectronics STM32F205 ARM Cortex-M3 @120MHz, and has 128 KB SRAM and 1MB Flash. It supports Wi-Fi 802.11n (2.4GHz only) + Bluetooth 4.1 (Dual Mode):


It’s available from Seeed Studio: RedBear DUO.


I made interaction with lisp possible via the Particle cloud:

The call back is defined in the lisp library (it’s a simple loopback now) and the local REPL is still running!