SparkFun SAMD21 Dev Breakout

Vendor: SparkFun
Features: Battery Charging, DAC, USB
Source on GitHub: samd/SPARKFUN_SAMD21_DEV_BREAKOUT
More info: Website

Installation instructions

For deploying the MicroPython firmware to the SAMD module, follow the procedure:

  • Push the reset button twice or call machine.bootloader(). A drive icon should appear representing a virtual drive.

  • Copy the .uf2 file with the required firmware to that drive.

As soon as the drive disappears, the firmware is loaded and started.

Firmware

Releases

v1.26.1 (2025-09-11) .uf2 / [Release notes] (latest)
v1.26.0 (2025-08-09) .uf2 / [Release notes]

Preview builds

v1.27.0-preview.379.ge0a9b7023b (2025-11-03) .uf2
v1.27.0-preview.366.g6773051b5a (2025-10-27) .uf2
v1.27.0-preview.355.g7373338fa9 (2025-10-24) .uf2
v1.27.0-preview.355.g7373338fa (2025-10-24) .uf2
v1.27.0-preview.317.g9999553aa (2025-10-17) .uf2
(These are automatic builds of the development branch for the next release)