Product information:
This STM32F405 Feather Express runs CircuitPython at a frequency of 168MHz - our fastest CircuitPython board ever! We have installed a stemmaqt/Qwiic port at the end so that you can easily insert and connect I2C sensors.
You can use MicroPython, CircuitPython, or Arduino IDE to handle this board.
CircuitPython support is currently under development. We have digital IO, analog input/output, I2C, SPI, PWM working so far and many more ways. For example, this device does not yet support SDIO SD cards. Display IO is also not supported.
Arduino provides support through STM32duino. At present, there is no support for automatically resetting the boot loader, so you must pull up the BOOT0 pin and manually reset it before uploading.
MicroPython support is very reliable.
We tested this in Arduino STM32duino, and only the RFM69/RFM9x libraries did not work (they are very platform specific).
Product features:
Product dimensions: 52.0mm x 23.0mm x 10.0mm/2.0 inches x 0.9 inches x 0.4 inches
Product weight: 6.2g/0.2oz
STM32F405 Cortex M4， Equipped with FPU and 1MB flash memory, with a speed of 168MHz
Total memory 192KB - General use of 128 KB memory+64 KB/cache RAM limited to programs
3.3V logic, but almost all pins comply with 5V!
USB C power and data interface
LiPo connector and charger interface
Bottom SD socket, connected to SDIO port
2MB SPI flash memory chip
Built in NeoPixel indicator
I2C、UART、GPIO、ADC、DAC
Qwiic/STEMA-QT connector for fast I2C connection
We use the built-in USB DFU bootloader to load firmware
