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CircuitPython 1.0.0 Release Candidate 4

From the GitHub release page:

One consistency change thanks to @ladyada! This release was made from the stable branch. The master branch is now working towards the 2.0.0 release.

This release is based on MicroPython 1.8.7.

Change highlights since 1.0.0-rc.3:

  • atmel-samd: Change to non-blocking mode for streams. That means UART.read() will return None when no data is available instead of raising OSError.
  • atmel-samd: Reboot to bootloader after 1200 baud serial connection is closed. Arduino uses this to flash a new sketch.
  • atmel-samd: Give on-board flash file systems unique Volume IDs based on the serial number of the MCU.
  • atmel-samd: Prep for Gemma M0 and Trinket M0.

To install, download a .bin file and follow the guide here for M0 and here for ESP8266.

Have a Feather M0 Express, Metro M0 Express, or Circuit Playground Express? Download a .uf2 and follow these instructions. To install our libraries simply download the latest bundle and copy the lib folder onto your CIRCUITPY drive.


Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.

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