Adafruit Feather STM32F405 Express
Feather-format STM32F405 Cortex-M4 board at 168 MHz with 1 MB flash, 192 KB RAM, 2 MB SPI flash, SD socket (SDIO), STEMMA QT, USB-C, and LiPo charger. Uses DFU bootloader instead of UF2; Arduino IDE setup requires manual BOOT0 steps.
Pinout
- GND
Common ground for all power and logic on the Feather STM32F405 Express board.
Type · groundVoltage · 0V reference; source states common ground for power and logic. - BAT
Positive voltage to/from the JST jack for the optional LiPoly battery.
Type · powerVoltage · Battery input/output; exact battery voltage not restated on pinouts page. - USB
Positive voltage to/from the USB-C jack when connected.
Type · powerVoltage · USB bus voltage; source identifies it as the USB-C positive voltage. - EN
3.3V regulator enable pin; pulled up, connect to ground to disable the 3.3V regulator.
Type · controlVoltage · 3.3V regulator enable control; pulled up per source. - 3V
Output from the 3.3V regulator for board/peripheral power.
Start wiring
USB · 3.3 V
Confirm the data interface matches your host board.
Module pins: BAT, USB, 3V, STEMMA QT / Qwiic 3.3V, GND, STEMMA QT / Qwiic GND, SDA / GPIO 14 / PB7, SCL / GPIO 15 / PB6. Schematik maps them to your board in the app.
Other MCUs
225 other optionsSpecialists: Teensy for high-clock audio and USB, Adafruit SAMD boards running CircuitPython or the Arduino IDE, proper STM32 eval kits, and the micro:bit classroom ecosystem. Schematik builds target ESP32, Arduino Uno, and Pico; come here when you have a specific reason to.
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