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CircuitPython 3.0.2 Released! — @adafruit @CircuitPython

Download the 3.0.2 release from

This is the a bug fix and minor feature release for the 3.x stable series. There are a few important fixes and some additions to busio.UART. Please check out the 3.0.0 release notes for full details on what’s new in 3.0.0.

Changes since 3.0.1

  • Adjust neopixel write timings on the M4: On-board NeoPixel stopped working on M4 boards in 3.0.1. Thanks to @jerryneedell for the fix and testing, and @ash0x1b for the issue.
  • Handle USB output buffer >255 characters. Thanks @daguitarguy for the issue, initially noticed in the REPL, and thanks @dhalbert for the fix.
  • Allocate PWMOut timer channels correctly. Previously some TCC timer channels were being incorrectly reused in multiple PWMOut objects. Thanks @deshipu for the issue and @dhalbert for the fix.
  • When UART timeout of zero is given, make return available data. Thanks to @PaulKierstead for the fix.
  • Re-initialize default board busses on soft reset (board.SPIboard.I2Cboard.UART). Thanks @dhalbert.
  • Add UART.in_waiting and UART.reset_input_buffer(), which mirror functionality in PySerial. Thanks@dhalbert, and thanks to @ladyada for the suggestions.


To install follow the instructions in our new Welcome to CircuitPython! guide. To install the latest libraries, see this page in that guide.

Try the latest version of the Mu editor for creating and editing your CircuitPython programs and for easy access to the CircuitPython serial connection (the REPL).

All builds are available as both UF2 and bin files here along with test builds.


Documentation is available on

Here are all the changes since 3.0.0.

This release is based on MicroPython 1.9.3. Support upstream MicroPython by purchasing a PyBoard (from Adafruit here).


Pre-built mpy-cross executables are available above for MacOS, Windows, Ubuntu, and Raspbian.


Check out this guide for info on common problems with CircuitPython. If you are still having, then post to the Adafruit Support Forums and join Discord.

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