Adafruit Feather STM32F405 Express

ST takes flight in this Feather board. The new STM32F405 Feather runs CircuitPython at a blazing 168MHz – our fastest CircuitPython board ever! It features a STEMMA QT / Qwiic port for easy plug-and-play I2C sensor connectivity.

• STM32F405 Cortex M4 with FPU and 1MB Flash, 168MHz speed
• 192KB RAM total (128 KB general usage + 64 KB program-only/cache RAM)
• 3.3V logic with almost all pins 5V compliant
• USB C power and data (first USB C Feather!)
• LiPo connector and charger
• SD socket on 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
• Uses built-in USB DFU bootloader; no UF2 bootloader

Supports CircuitPython, MicroPython, and Arduino IDE (with some caveats). CircuitPython support is robust with many interfaces supported. Arduino support through STM32duino requires manual reset due to no auto-reset bootloader. MicroPython support is solid but without Adafruit sensor libraries.

This exceptionally fast Feather board is the first STM32 Feather and is compatible with various FeatherWings except for RFM69/RFM9x libraries.

Product Dimensions: 52.0mm x 23.0mm x 10.0mm (2.0" x 0.9" x 0.4")
Product Weight: 6.2g (0.2oz)