{"title":"Adafruit Feather STM32F405 Express","handle":"adafruit-feather-stm32f405-express","url":"/products/adafruit-feather-stm32f405-express","description":"The Adafruit Feather STM32F405 Express brings STM32 power to the Feather ecosystem, running CircuitPython at a blistering 168 MHz — making it one of the fastest CircuitPython-capable Feather boards. With 1 MB of flash, 192 KB of SRAM, USB Type C, an SDIO-connected SD card slot, and a STEMMA QT connector, it packs serious capability into the standard Feather form factor.\n\nMost pins on this 3.3 V board are 5 V tolerant, making it straightforward to interface with a wide range of sensors and peripherals. The built-in USB DFU bootloader is used for firmware loading (this board does not use a UF2 bootloader).\n\nKey Features\n\n\nSTM32F405 Cortex-M4 – 168 MHz with FPU, 1 MB flash, 192 KB SRAM\n\nUSB Type C – Power and data; uses built-in USB DFU bootloader for firmware loading\n\nMicroSD Card Slot – Connected via SDIO on the bottom of the board\n\n2 MB SPI Flash – For CircuitPython code and file storage\n\nSTEMMA QT / Qwiic Connector – Plug-and-play I2C sensor connectivity with no soldering\n\nBuilt-in NeoPixel – RGB status indicator\n\nLiPo Connector and Charger – Built-in battery management\n\n5 V Tolerant Pins – Most GPIO pins accept 5 V logic levels\n\nRich Peripherals – I2C, UART, SPI, multiple ADCs, and DACs\n\n\nProgramming Support\n\n\nCircuitPython – Digital IO, analogue in/out, I2C, SPI, and PWM supported; SDIO SD card and DisplayIO are not yet supported natively\n\nArduino – Supported via STM32duino; no auto-reset bootloader yet, so you must pull the BOOT0 pin high and manually reset before uploading\n\nMicroPython – Solid support, though Adafruit does not provide MicroPython sensor libraries\n\n\n\nNote: Compatible with nearly all FeatherWings. The RFM69/RFM9x radio FeatherWings are not supported due to platform-specific library requirements.\n\n\nIdeal For\n\nHigh-performance CircuitPython projects requiring fast execution\nData logging with the built-in MicroSD slot\nProjects requiring 5 V tolerant GPIO\nBattery-powered embedded applications\n\n\nPackage Contents\n\n1× Adafruit Feather STM32F405 Express\n","vendor":"Adafruit","product_type":"physical","in_stock":false,"options":[],"variants":[{"id":4741,"title":"Default Title","sku":"AF-4382","price":46.0,"compare_at_price":81.0,"on_sale":true,"in_stock":false,"available_quantity":0,"option1":"Default Title"}]}