{"title":"Adafruit Feather M4 Express - Featuring ATSAMD51 - ATSAMD51 Cortex M4","handle":"adafruit-feather-m4-express-featuring-atsamd51-atsamd51-cortex-m4","url":"/products/adafruit-feather-m4-express-featuring-atsamd51-atsamd51-cortex-m4","description":"The Feather M4 Express is built around the ATSAMD51J19, a 120 MHz Cortex M4 processor with hardware floating point and DSP instructions, 512 KB flash, and 192 KB RAM. It ships with CircuitPython pre-loaded — plug it in and it appears as a small USB drive with main.py ready to edit. No installs, IDE, or compiler needed.\n\nThe board includes 2 MB SPI flash for storing CircuitPython scripts and libraries (or Arduino data files), a Mini NeoPixel, a prototyping area, and the UF2 drag-and-drop bootloader. It works with the Arduino IDE as well, and is compatible with all FeatherWings.\n\nKey Features\n\n\nATSAMD51J19 Processor – 120 MHz Cortex M4 with hardware floating point and DSP, 3.3V logic\n\n512 KB Flash + 192 KB RAM – Substantial memory for complex applications\n\n2 MB SPI Flash – On-board file storage for CircuitPython scripts or Arduino data logging\n\nCircuitPython Pre-loaded – Edit code directly on the USB drive, works on any computer\n\nUF2 Bootloader – Drag-and-drop firmware loading; compatible with CircuitPython and Arduino IDE\n\nNative USB – Built-in USB with bootloader and serial port debugging\n\nHardware Crypto – AES-256, true RNG, and public key controller\n\n21 GPIO Pins – 6× hardware SERCOM (SPI, I2C, Serial), 16× PWM, I2S input/output, 8-bit parallel capture\n\nAnalogue I/O – 2× 12-bit 1 MSPS DAC (stereo audio capable) and 2× 12-bit 1 MSPS ADC (6 analogue pins)\n\nMini NeoPixel – On-board addressable RGB LED\n\nLiPo Battery Support – JST connector with built-in 100 mA charger and charging status LED\n\n32.768 kHz Crystal – For accurate clock generation and RTC\n\nPrototyping Area – Small grid of through-holes for custom circuitry\n\nCompact Design – 51 mm × 23 mm × 8 mm, weighing 5 g\n\n\nAlso Available\n\n\nFeather M4 CAN Express – Same M4 performance with built-in CAN bus (ATSAME51)\n\n\nIdeal For\n\nHigh-performance CircuitPython and Arduino development\nAudio processing with dual 12-bit DACs\nPortable battery-powered projects\nRapid prototyping with drag-and-drop programming\n\n\nPackage Contents\n\n1× Feather M4 Express (ATSAMD51)\n1× Header pin set\n\n\n\nNote: LiPo battery and USB cable sold separately.\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":5854,"title":"Default Title","sku":"AF-3857","price":46.22,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":104,"option1":"Default Title"}]}