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seeed-xiao-samd21

3 min read

Important Note

This entire repo was AI created - including all of the data within. The intent was to A) help me with my personal electronics inventory; and B) see how I could use AI to make that process a bit easier. DO NOT TRUST!

Seeed Studio XIAO SAMD21

Details

Description

Ultra-compact ARM Cortex-M0+ microcontroller development board featuring the ATSAMD21G18 with USB connectivity. Part of the XIAO series, this tiny board provides powerful 32-bit processing capabilities in a thumb-sized form factor perfect for embedded applications, wearables, and Arduino projects.

Specifications

  • Part Number: 102010328
  • Microcontroller: ATSAMD21G18
  • Architecture: 32-bit ARM Cortex-M0+
  • Clock Speed: 48MHz
  • Operating Voltage: 3.3V
  • Input Voltage: 5V (via USB-C) or 3.3V
  • Flash Memory: 256KB
  • SRAM: 32KB
  • Dimensions: 20.0mm x 17.5mm x 3.5mm
  • Weight: ~2.3g

Image

Seeed Studio XIAO SAMD21

Features

  • ARM Cortex-M0+: Efficient 32-bit RISC processor
  • USB-C Connector: Modern connector for programming and power
  • Compact Size: Smallest SAMD21 development board
  • Arduino Compatible: Full Arduino IDE support
  • CircuitPython: Native CircuitPython support
  • MicroPython: MicroPython compatibility
  • Rich Peripherals: Multiple communication interfaces

Pin Configuration

  • Digital I/O: 11 pins
  • Analog Inputs: 10 pins (A0-A9, 12-bit resolution)
  • PWM: All digital pins support PWM
  • I2C: SDA (A4), SCL (A5)
  • SPI: MOSI (A10), MISO (A9), SCK (A8)
  • UART: TX (A6), RX (A7)
  • Special: D0-D10 (GPIO), A0-A9 (ADC)

Power Specifications

  • Operating Voltage: 3.3V
  • Input Voltage: 5V (USB-C) or 3.3V (VCC)
  • Current Consumption:
    • Active: ~15mA (typical operation)
    • Sleep: ~10μA (standby mode)
    • Deep Sleep: ~2μA (deep sleep mode)
  • Power Management: Multiple sleep modes available

Connectivity

USB

  • Type: USB-C connector
  • Speed: Full-speed USB 2.0
  • Functions: Programming, power, serial communication
  • Native USB: Hardware USB support

Applications

  • Wearable devices
  • IoT sensor nodes
  • Arduino projects
  • Educational platforms
  • Prototyping boards
  • Embedded systems
  • Data logging
  • Interactive art projects

Programming

  • Arduino IDE: Full support with SAMD board package
  • CircuitPython: Native support, drag-and-drop programming
  • MicroPython: Compatible with MicroPython
  • Atmel Studio: Professional development environment
  • PlatformIO: Cross-platform development

XIAO Ecosystem

  • Form Factor: Compatible with all XIAO accessories
  • Expansion Boards: Grove Base, Expansion Board
  • Shields: Various XIAO-compatible shields available
  • Community: Large XIAO developer community

Advantages

  • ARM Architecture: Powerful 32-bit processing
  • USB Native: Hardware USB support
  • Low Power: Excellent for battery applications
  • Easy Development: Arduino IDE and CircuitPython support
  • Rich Peripherals: Multiple ADC channels and interfaces
  • Cost Effective: Great price-to-performance ratio

Notes

  • Smallest SAMD21 development board available
  • Perfect for learning ARM Cortex-M0+ architecture
  • Excellent CircuitPython support for beginners
  • Native USB makes it ideal for HID projects
  • Compatible with XIAO ecosystem of accessories
  • Great for educational and prototyping applications
  • Low power consumption suitable for battery projects

Tags

microcontroller, arm, cortex-m0+, samd21, usb, xiao, seeed, arduino, circuitpython

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