This month Adafruit has made available their new STM32F405 Feather Express hardware which offers the fastest CircuitPython development board yet created running at 168MHz. The small development board is priced at $24.95 and includes a STEMMA QT / Qwiic port on the end, allowing you to easily add plug and play I2C sensors when required. The new develop on board can be used with MicroPython, CircuitPython or Arduino IDE, but because the board and chipset is new so expect rapid developments and updates to be rolled out by Adafruit.
– CircuitPython support is under development. We have digital IO, analog in/out, I2C, SPI, PWM working so far and more on the way. For example, the SDIO SD card is not yet supported natively. DisplayIO is also not yet supported.
– Arduino is supported through STM32duino. There’s no auto-reset bootloader support yet so you have to pull the BOOT0 pin high and manually reset before uploading. That said, STM32 support is really good, and we were able to run just about every sketch we tried.
– MicroPython support is very solid but Adafruit does not provide MicroPython libraries for sensors!
“With CircuitPython basics running on this board, it’s fast to get all our drivers working, then use the built in plotter in Mu to instantly get sensor data displaying within 3 minutes of unboxing. We tested this in Arduino STM32duino with all our FeatherWings and only the RFM69/RFM9x libraries did not work (they are very platform specific). Its an extraordinarily fast Feather, and our first foray into STM32 – very exciting!”
For more information on the new boards jump over to the official Adafruit online store by following the link below.