ST takes flight in this new Feather board. This STM32F405 Feather (video) runs CircuitPython at a blistering 168MHz – our fastest CircuitPython board ever! We put a STEMMA QT / Qwiic port on the end, so you can really easily plug and play I2C sensors.

This Feather has lots of goodies:

• STM32F405 Cortex M4 with 1MB Flash, 168MHz speed
• 3.3V logic, but almost all pins are 5V compliant!
• USB C power and data - our first USB C Feather!
• LiPo connector and charger
• SD socket on the bottom, connected to SDIO port
• 2 MB SPI Flash chip
• Built in NeoPixel indicator
• I2C, UART, GPIO, ADCs, DACs
• Qwiic/STEMMA-QT connector for fast I2C connectivity
• We use the built-in USB DFU bootloader to load firmware. It does not come with a UF2 bootloader.

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.

You can use MicroPython, CircuitPython or Arduino IDE with this board, with some caveats.

• CircuitPython support is under development. F4 family boards like this one are considered stable, and support common modules like digital IO, analog IO, I2C, SPI, PWM, and displays. Some less-used modules may be missing compared to the SAMD-type Feathers - you can check the exact list of supported modules on our documentation's Support Matrix.
• 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!

We tested this in Arduino STM32duino with all our FeatherWings and only the RFM69/RFM9x libraries did not work (they are very platform specific). It's an extraordinarily fast Feather, and our first foray into STM32 - very exciting!