CircuitPython 7.3.0 Beta 0 Released! @circuitpython

From the GitHub release page:

This is CircuitPython 7.3.0-beta.0, the first published beta release for CircuitPython 7.3.0. It is relatively stable, but there will be further additions and fixes before final release.

Notable changes to 7.3.0 since 7.2.4

  • Experimental mDNS support.
  • USB to to Serial/JTAG support for REPL on appropriate boards.
  • Initial experimental USB host support.
  • Merge MicroPython 1.18 changes.

Download from

Firmware downloads are available from the downloads page on The site makes it easy to select the correct file and language for your board.


To install follow the instructions in the 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).


Documentation is available in

Port status

CircuitPython has a number of “ports” that are the core implementations for different microcontroller families. Stability varies on a per-port basis. As of this release, these ports are consider stable:

  • atmel-samd: Microchip SAMD21, SAMx5x
  • cxd56: Sony Spresense
  • espressif: Espressif ESP32-S2
  • nrf: Nordic nRF52840, nRF52833
  • raspberrypi: Raspberry Pi RP2040
  • stm: ST STM32F4 chip family

These ports are considered alpha and will have bugs and missing functionality:

  • broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
  • espressif: ESP32-S3, ESP32-C3
  • litex: fomu
  • mimxrt10xx: NXP i.MX RT10xxx
  • stm: ST non-STM32F4 chip families

Changes since 7.3.0-alpha.0 (7.2.x branch)

These changes are since the 7.3.0-alpha.0 tag, which was not released. The tag was created when the 7.2.x branch was created.

Fixes and enhancements

  • Experiment mDNS support. #6193, #6175. Thanks @tannewt and @jepler.
  • Fix non-scaled frame buffers. #6192. Thanks @gamblor21.
  • Add USB to Serial/JTAG support for REPL. #6181. Thanks @tannewt.
  • Palette color index specification for vectorio shapes.
  • Autoreload fixes from 7.2.x. #6160. Thanks @tannewt and @dhalbert.
  • Initial experimental USB host support. #6125. Thanks @tannewt.
  • Make paralleldisplay reset and read pins optional. #6118. Thanks @deshipu.
  • Allow from __future__ import annotations. #6117. Thanks @dhalbert.
  • Support 9-bit mode for displayio.FourWire. #6114. Thanks @deshipu.
  • Fix bitmaptools.dither. #6112. Thanks @t-ikegami.
  • Allow resize of REPL window via access to repl Group. #6088 (port from 7.2.x). Thanks @kmatch98.
  • msgpack.unpack requires a readable stream. #6073. Thanks @prplz.
  • Allow import of dotted builtin modules. #6068. Thanks @jepler.
  • Enable use of _asyncio module, optionally used in asyncio. #6041. Thanks @t-ikegami.
  • Merge MicroPython 1.18. #6038. Thanks @jepler.
  • Allow compile-time removal of the Blinka logo on displays. #5298. Thanks @deshipu.

Port and board-specific changes



  • Fix 3-wire SPI. #6191. Thanks @tannewt.
  • Fix interrupts in UART console workflow. #6187. Thanks @prplz.
  • Update ESP-IDF to fix PinAlarm. #6144. Thanks @tannewt.
  • Fix I2C pull-up detection. #6126. Thanks @prplz.
  • Update root certificates. #6097. Thanks @FoamyGuy.




  • Fix countio objects to work across imports. #6106. Thanks @DavePutz.
  • Fix and improve alarm. #6048. Thanks @t-ikegami.


  • Add STM32F412Cx support. #6095. Thanks @sgauche.
  • Fix SPI clock pull, baesd on SPI polarity. #6067. Thanks @sgauche.

Individual boards

  • Adafruit ESP32-S2 Camera board: add missing pins, speed up display. #6094. Thanks @ladyada.
  • Adafruit Feather ESP32-S2: enable I2C power by default. #6103. Thanks @ladyada.
  • Adafruit Feather M4 CAN: add EVE support. #6098. Thanks @jamesbowman.
  • AI Thinker ESP32-C3S: fix handling of LEDs. #6065. Thanks @prplz.
  • Espressif ESP32-S3 Box: fix display color. #6140. Thanks @tannewt.
  • MakerDiary USB Dongle: enable RGB status LED. #6189. Thanks @Neradoc.
  • Melopro Shake RP2040: add standard board attributes. #6123. Thanks @prplz.
  • Muselab nanoESP32S2: enable SPIRAM support. #6199. Thanks @erongd.
  • Nordic PCA10059 dongle: add status LED. #6198. Thanks @jerryneedell.
  • Seeeduino Xiao KB: add pins. #6123. Thanks @prplz.
  • Seeeduino Xiao nRF52840: add standard board attributes. #6107. Thanks @prplz.
  • Seeeduino Xiao nRF52840 Sense: add RGB status LED. #6105. Thanks @prplz.
  • Seeeduino Xiao SAMD21: add LED definitions. #6121. Thanks @ricksorensen.
  • Swan R5: add standard board attributes. #6107. Thanks @prplz.

Documentation changes

  • Fix countio type hints. #6162. Thanks @prplz.
  • Document binascii.crc32(). #6131. Thanks @Neradoc.
  • Clarify availability of certain math functions. #6110. Thanks @tekktrik.
  • Correct type annotations in wifi. #6104. Thanks @FoamyGuy.
  • Fix argument name in usb_hid.Device. #6101. Thanks @prplz.
  • Fix msgpack type annotations. #6085. Thanks @rimwolf-redux.

Build and infrastructure changes

  • Pin typer and click Python libraries to fix an incompatibility problem. #6210. Thanks @dhalbert.
  • Improve USB VID/PID duplicate checker. #6194. Thanks @jepler.
  • Clean up many board definitions. #6182. Thanks @tannewt.
  • Implement color_index for palette for vectorio shapes. #6176. Thanks @FoamyGuy.
  • Mark certain variables as unused to satisfy clang warnings. #6158. Thanks @nicolasff.
  • Fix gcc 11.2 SAMD5x builds. #6128. Thanks @tannewt.

Translation additions and improvements

Thanks for translations:

  • @bergdahl (Swedish)
  • @fabaff (German)
  • @wtuemura (Portugese – Brazil)

New boards since 7.3.0-alpha.0

  • Adafruit Feather ESP32-S3 No PSRAM. #6178. Thanks @ladyada.
  • Espressif ESP32-S3-DevKitM-1-N8 #5963. Thanks @arturo182.
  • Espressif ESP32-S3-USB-OTG-N8l #6190. Thanks @tannewt.
  • FutureKeys HexKyS2. #6135. Thanks @CircuitART.
  • iLabs Challenger 840. #6184. Thanks @PontusO.
  • LILYGO TTGO T-01C3. #6155. Thanks @prplz.
  • LILYGO TTGO T8 ESP32S2. #6079. Thanks @fabaff.
  • LILYGO TTGO ESP32-S2-WROOM. #6084. Thanks @fabaff.
  • Pimoroni Badger 2040. #6208, #6143, #6074. Thanks @ZodiusInfuser.
  • Pimoroni Servo2040. #6209, #6197. Thanks @ZodiusInfuser.
  • Switch Science ISP1807 Dev Board. #6156. Thanks @arms22.
  • Switch Science ISP1807 Micro Board. #6157. Thanks @arms22.

Known issues

  • See for other issues, including issues still to be addressed for:


Thank you to all who used, tested, and contributed since 7.3.0-alpha.0, including the contributors above, and many others on GitHub and Discord. Join us on the Discord chat to collaborate.

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