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

v1.27.0 (2025-12-09) .uf2 / [Release notes] (latest)
v1.26.1 (2025-09-11) .uf2 / [Release notes]
v1.26.0 (2025-08-09) .uf2 / [Release notes]

Preview builds

v1.27.0-preview.503.g2bd337ef18 (2025-12-08) .uf2
v1.27.0-preview.491.g3f796b687b (2025-12-03) .uf2
v1.27.0-preview.490.g0b1a6bebae (2025-12-03) .uf2
v1.27.0-preview.486.ge6a7dc1114 (2025-12-01) .uf2
(These are automatic builds of the development branch for the next release)