Description The Adafruit Feather M4 Express is a fast ATSAMD51 Cortex-M4 development board in the Feather ecosystem. It is built around the ATSAMD51J19 running at 120MHz with floating-point support, 512KB Flash, 192KB RAM, and an extra 2MB SPI Flash chip for CircuitPython files or data storage. This Feather M4 Express ships with UF2 bootloader and CircuitPython support, so it can appear as a small USB drive for quick code editing while still supporting Arduino IDE and native USB serial workflows. The board offers GPIO, PWM, ADC, DAC, I2C, SPI, UART, I2S, LiPo charging, a Mini NeoPixel, and a small prototyping area. Because it follows the Feather form factor, the Adafruit Feather M4 Express works well with compatible FeatherWing add-ons, breadboards, education labs, rapid firmware tests, sensor hubs, data loggers, and compact embedded prototypes. LiPo battery and USB cable are not included. Features ATSAMD51J19 Cortex-M4 microcontroller at 120MHz with 32-bit 3.3V logic. 512KB Flash, 192KB RAM, and 2MB SPI Flash for CircuitPython storage and data files. UF2 bootloader for drag-and-drop firmware updates without special programming tools. Native USB support for bootloader, serial debugging, CircuitPython, and Arduino workflows. 21 GPIO pins, 6 analog inputs, two 12-bit DAC outputs, 16 PWM outputs, I2C, SPI, UART, and I2S. 100mA LiPo charger, charge status LED, 3.3V regulator with 500mA peak output, and power/enable pin. Mini NeoPixel, pin 13 red LED, reset button, prototyping area, and four mounting holes. Feather-compatible layout for FeatherWing expansion boards and breadboard prototyping. Specifications OpenELAB SKU Adafruit-3857 Official Product Name Adafruit Feather M4 Express - Featuring ATSAMD51 Microcontroller Microchip ATSAMD51J19, 120MHz Cortex-M4 Logic Level 3.3V Memory 512KB Flash, 192KB RAM, 2MB SPI Flash GPIO 21 GPIO, 16 PWM, 6 analog inputs, 2 DAC outputs Interfaces USB, I2C, SPI, UART, I2S, native USB serial Power USB or LiPo battery; onboard 100mA LiPo charging Dimensions 50.8mm x 22.8mm x 7.0mm Weight 4.8g Applications CircuitPython and Arduino prototyping with a fast Cortex-M4 board. Data loggers, sensor hubs, USB HID devices, audio/PWM demos, and lab experiments. FeatherWing expansion for displays, relays, radio modules, sensors, and prototyping. Education, maker-space projects, firmware testing, and compact embedded development. Product List 1 x Adafruit Feather M4 Express development board 1 x set of solderable headers LiPo battery and USB cable are not included Other Content The official diagrams below help confirm the Adafruit Feather M4 Express pinout, interface planning, schematic details, and board layout before a prototype is wired or documented. The schematic and fabrication print are useful for debugging, enclosure planning, and checking board-level integration details. The official board photos show breadboard placement, header orientation, and the prototyping area in practical use. Resources Official Adafruit Feather M4 Express Learn Guide Downloads, pinout, schematic, and PCB files Microchip ATSAMD51J19A product information Adafruit Feather M4 Express PCB repository FAQ Is this board ready for CircuitPython?Yes. The Adafruit Feather M4 Express is designed for CircuitPython and uses the extra 2MB SPI Flash for files, libraries, and code storage. Can it also run Arduino sketches?Yes. This ATSAMD51 Cortex-M4 development board supports Arduino IDE workflows as well as UF2 firmware loading. Are a battery and USB cable included?No. The board and headers are included; a LiPo battery and USB cable are selected separately. What logic voltage does it use?The Feather M4 Express is a 3.3V logic board with 3.3V power rails. What is the 2MB SPI Flash for?It can store CircuitPython code, libraries, and files, or work as small file storage in Arduino projects.
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