CircuitBrains Basic

by Null Byte Labs LLC

Image of Board

CircuitPython on an ARM Cortex M0 in 1 square inch! This “Just Add Solder” castellated module is perfect for incorporating into your own project. The CircuitBrains Basic board footprint is small enough to fit into narrow spaces and wearable projects.

Technical Specs

  • Dimensions: 25 x 25 x 3.5 millimeters / 1 x 1 x 0.15 inches
  • Atmel ATSAMD21E18 Microcontroller (32-bit ARM Cortex M0)
  • 48 MHz
  • 32 KB SRAM
  • 256 KB Flash
  • 4 MB QSPI Flash
  • Onboard 3.3V LDO Regulator
  • Power and Status LEDs
  • Breakouts for SPI and I2C
  • Breakouts for 4 Analog and 8 Digital Inputs/Outputs


Coming soon. Follow the below links for manufacturing updates:


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CircuitPython 5.0.0

This is the latest stable release of CircuitPython that will work with the CircuitBrains Basic.

Start here if you are new to CircuitPython.

Release Notes for 5.0.0

CircuitPython 5.1.0-rc.0

This is the latest unstable release of CircuitPython that will work with the CircuitBrains Basic.

Unstable builds have the latest features but are more likely to have critical bugs.

Release Notes for 5.1.0-rc.0

Absolute Newest

Every time we commit new code to CircuitPython we automatically build binaries for each board and language. The binaries are stored on Amazon S3, organized by board, and then by language. Try them if you want the absolute latest and are feeling daring or want to see if a problem has been fixed.

Past Releases

All previous releases are listed on GitHub, with release notes, and are available for download from Amazon S3. They are handy for testing, but otherwise we recommend using the latest stable release. Some older GitHub release pages include the same binaries for downloading. But we have discontinued including binaries as assets on newer release pages because of the large number of files for each release.