arduino › microcontroller board
adafruit Adafruit Metro M0 Express
UNO footprint but 3.3V logic. Most UNO shields work; any shield that drives a 5V signal into a Metro pin will damage it. Always check shield logic level first.
Specifications
- mcu chip
- atsamd21
- clock mhz
- 48
- flash kb
- 256
- sram kb
- 32
- wifi
- no
- wifi band
- none
- bluetooth
- none
- usb
- micro_b
- gpio count
- 25
- analog inputs
- 6
- pwm pins
- 9
- i2c
- yes
- spi
- yes
- uart count
- 1
- operating voltage v
- 3.3
- input voltage range v
- 6-12
- power pins
- 3v3, 5v, vin
- firmware compat
- arduino_ide, circuitpython, platformio
- ai accelerator
- none
- form factor
- uno
Sources
- Adafruit open product catalog · ingest 2026-05-06