arduino › microcontroller board
adafruit Adafruit Feather M4 Express
Cortex-M4F with FPU and 2 MB QSPI flash for CircuitPython library storage. Picked for audio synth, fast DSP, and any project that wants Feather form factor without onboard wireless (pair with an RFM69 or AirLift FeatherWing).
Specifications
- mcu chip
- atsamd51
- clock mhz
- 120
- flash kb
- 512
- sram kb
- 192
- wifi
- no
- wifi band
- none
- bluetooth
- none
- usb
- micro_b
- gpio count
- 21
- analog inputs
- 6
- pwm pins
- 16
- i2c
- yes
- spi
- yes
- uart count
- 1
- operating voltage v
- 3.3
- input voltage range v
- 3.3-6
- power pins
- 3v3, vbat, vusb
- firmware compat
- arduino_ide, circuitpython, platformio
- ai accelerator
- none
- form factor
- feather
Sources
- Adafruit open product catalog · ingest 2026-05-06