Adafruit METRO M0 Express - designed for CircuitPython - ATSAMD21G18

The Adafruit Metro M0 Express is a powerful microcontroller board designed for use with CircuitPython and Arduino. Based on the ATSAMD21G18 ARM Cortex-M0+ processor, it combines high performance with ease of use. With its native USB interface and UF2 bootloader, programming is simple, fast, and reliable, making it suitable for both beginners and experienced makers.

The board features extra memory, a built-in NeoPixel LED, and a wide range of I/O options. This makes it highly versatile for applications ranging from educational use to advanced electronics prototyping. The Metro M0 Express is fully compatible with Arduino shield formats and can be easily integrated into existing projects.

Features

• Powerful ATSAMD21G18 ARM Cortex-M0+ microcontroller board
• Optimized for CircuitPython and Arduino IDE
• Native USB with UF2 bootloader for easy programming
• Built-in NeoPixel LED and indicator LEDs
• Compatible with Arduino shields and extensions
• Extensive I/O options for versatile projects

Specifications

• Processor: ATSAMD21G18 ARM Cortex-M0+, 48 MHz, 3.3 V logic
• Memory: 256 KB Flash, 32 KB RAM, 2 MB SPI Flash storage
• I/O pins: 25 GPIO (12 analog-in, 1 DAC, PWM supported)
• Interfaces: UART, I²C, SPI
• USB: native USB, supports serial, mass storage, and HID
• Power supply: 5V via USB or 7–9V DC jack (with switch)
• Dimensions: 71 x 53 x 13 mm
• Weight: approx. 20 g
• Includes: rubber bumpers