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Seeed Studio XIAO SAMD21(Seeeduino XIAO) - Arduino Microcontroller - SAMD21 Cortex M0+ with Free Course

SKU
102010328

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PRODUCT DETAILS

Seeed Studio XIAO Series are diminutive development boards, sharing a similar hardware structure, where the size is literally thumb-sized. The code name "XIAO" here represents its half feature "Tiny", and the other half will be "Puissant".

Seeed Studio XIAO SAMD21 is the pioneer, universal development board, extremely popular around the communities and derived a sight of projects. It is the perfect microcontroller for you to get started with electronics.

Features

  • High Performance: Powered by SAMD21G18 chip, operating up to 48MHz, equipped with 32KB of SRAM, and 256KB of onboard flash memory

  • Ultra-small Design: 21 x 17.5mm, Seeed Studio XIAO series classic form-factor, suitable for wearable devices

  • Multiple Development Interfaces: 11x analog / 11x digital Pins, 1x I2C interface, 1x UART port, and 1 SPI port

  • Multiple Develop Platform: Support Arduino / Micropython / CircuitPython development, friendly for beginners, satisfied for electronics enthusiasts

  • Perfect for Production: Breadboard-friendly & SMD design, no components on the back

Seeed Studio XIAO SAMD21 carries the powerful CPU-ARM® Cortex®-M0+(SAMD21G18) running at up to 48Hz. In addition to the powerful CPU, it has 256KB Flash and 32KB SRAM on board and supports the USB Type-C interface which can supply power and download code.

It has 14 GPIO PINs, which can be used for 11 analog PINs, 11 digital PINs, 1 I2C interface, 1 UART interface, and 1 SPI interface. Some PINs have various functions, A1/D1 to A10/D10 Pins have PWM functions and Pin A0/D0 has a function of DAC which means you can get true analog signals, not PWM signals when you define it as an analog pin, that’s why 14 GPIO PINs can realize more I/O PINs and interfaces.

Except for the power LED, we add a user LED on board for your better coding experience. Usually, a dev board as small as this size will use the chip’s inner crystal oscillator for time fixing, in order to make the clock more accurate, Seeed Studio XIAO SAMD21 layouts an extra 32.768KHz to make the clock more stable.

Moreover, Seeed Studio XIAO SAMD21 is friendly to the communities for its strong software compatibilities, which supports Arduino, Micropython, and CircuitPython. Except for the software, flexible I/O allows it to speak to almost any external device.

Starter Kit with free Course for all Electronics Neophytes and Enthusiasts

Seeed Studio has provided the Grove Starter Kit along with free and detailed courses for you quickly get started with microcontrollers and electronics, regarding all the Seeed Studio XIAO boards, promising you a great learning experience.

Not only programming but also electronics knowledge is not required, you will be taken step by step, from understanding the basic concepts to exercising the simple projects individually, finally being able to build complex, interesting, wearable projects on your own, owing a practical electronic product prototype from the course.

You can have access to the Seeed Studio Grove ecosystem by connecting it to the compatible Grove Shield for Seeed Studio XIAO. We have developed more than 400 Grove modules, covering a wide range of applications that can fulfill various needs. For example, you can make a Pocket Distance Alarm by connecting the Seeed Studio XIAO SAMD21 with a Seeed Studio Grove Shield for Seeeduino XIAO, a Grove - Circular LED, a Grove - Vibration Motor, and a Grove - Time of Flight Distance. Get started and explore the infinite possibilities of the Seeed Studio XIAO series!

By the way, we've set up a tinyml channel on our Discord server, please click to join for 24/7/365 making, sharing, discussing, and helping each other out.

We already have 5 XIAO products based on different solutions in the Xiao family, to help you better understand the differences and choose the most suitable part for your projects, please refer to the Seeed Studio XIAO Series Page.

Specification

Parameter Description
CPU ARM Cortex-M0+ CPU(SAMD21G18) running at up to 48MHz
Storage 256KB Flash,32KB SRAM
I/O PINs 14 GPIO PINs,11 analog PINs, 11 digital PINs, 1 DAC output Pin
Interface 1 I2C interface,1 UART interface, 1 SPI interface, USB Type-C interface
LEDs 1 user LED, 1 power LED, and two LEDs for serial port downloading
Reset button two reset buttons short connect to reset
Software compatibility Arduino IDE
Dimensions 21x17.5 mm

Application

  • Wearable devices
  • Rapid prototyping (directly attached to the expanded PCB as a minimal system)
  • Perfect for all the projects that need a mini Arduino
  • DIY keyboard
  • USB development (USB to multi-channel TTL/USB host mode, etc.)
  • In a scenario where you need to read multiple mock values The DAC output

Hardware Pinout

Part List

Seeed Studio XIAO SAMD21 1
Pasters 4

Check five pieces of 7-pin male header compatible for Seeed Studio XIAO Series Board!

Demo

Attention

All the I/O pins are 3.3V, please do not input more than 3.3V, otherwise, the CPU may be damaged.

FAQ

Does the XIAO microcontroller come with a pin header?

Currently, all XIAOs don't come with a pin header. You can purchase them through Also add or pin header.

ECCN/HTS

HSCODE 8543709990
USHSCODE 8471490000
UPC
EUHSCODE 8543709099
COO CHINA
CE 1
EU DoC 1
FCC 1
RoHS 1
UK DoC 1

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REVIEWS

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  1. Product Quality
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    from order view
    OK, OK, OK, OK, OK, OK,
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  2. Product Quality
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    from order view
    A very small PCB that plays well with the expansion board.
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  3. Product Quality
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    from order view
    Great quality and works as described. The only small issue is the included labels/stickers. The printed text is blurry and somewhat difficult to read.
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    from order view
    This micro controller is great for small devices and wearable projects.
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  5. Product Quality
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    from order view
    I like with Circuitpython, program without IDE
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