---
product_id: 203224713
title: "XIAO SAMD21"
brand: "seeed studio"
price: "7243 kr"
currency: ISK
in_stock: null
reviews_count: 10
category: "Seeed Studio"
url: https://www.desertcart.is/products/203224713-xiao-samd21
store_origin: IS
region: Iceland
---

# 48MHz ARM Cortex-M0+ CPU - 3x faster 20mm x 17.5mm - smallest Arduino microcontroller USB Type-C interface - modern & versatile XIAO SAMD21

**Brand:** seeed studio
**Price:** 7243 kr
**Availability:** ❌ Out of Stock

## Summary

> 🚀 Tiny Board, Massive Potential: Power Your Next Wearable Revolution!

## Quick Answers

- **What is this?** XIAO SAMD21 by seeed studio
- **How much does it cost?** 7243 kr with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/203224713-xiao-samd21)

## Best For

- seeed studio enthusiasts

## Why This Product

- Trusted seeed studio brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact Yet Feature-Packed:** Tiny thumb-sized footprint with 14 GPIO pins supporting analog, digital, I2C, UART, SPI, and USB-C connectivity.
- • **Blazing Fast Processing Power:** ARM Cortex-M0+ 32-bit CPU running at 48MHz, delivering triple the speed of classic Arduino boards.
- • **Wearable & Tiny Project Ready:** Optimized for low power consumption and small form factor, perfect for sleek wearable tech and compact DIY builds.
- • **Seamless Arduino IDE Compatibility:** Plug-and-play with Arduino IDE for rapid prototyping and effortless coding with extensive library support.
- • **Versatile Multi-Project Powerhouse:** Ideal for USB HID devices, custom keyboards, and multi-channel TTL/USB host mode applications—stay ahead of the innovation curve.

## Overview

The Seeed Studio XIAO SAMD21 is the smallest Arduino-compatible microcontroller board, featuring a powerful 48MHz ARM Cortex-M0+ CPU, 256KB flash memory, and 32KB SRAM. Despite its ultra-compact 20mm x 17.5mm size, it offers rich interfaces including 14 GPIO pins with analog/digital channels, I2C, UART, SPI, and a modern USB Type-C port. Fully compatible with Arduino IDE, it’s designed for wearable devices, rapid prototyping, and innovative small-scale projects, delivering high performance with low power consumption.

## Description

desertcart.com: Seeed Studio XIAO SAMD21 - Smallest Arduino Microcontroller with Rich Interfaces for Wearable Devices, 100% Arduino IDE Compatible, 3pcs : Electronics

Review: Great Tiny Microcontroller... - The Xiao was easy to setup in my Arduino IDE. Once I installed the correct "Board" in "Board Managers", I was able to upload code to the chip. Worked great.... for a day. Then the board stopped responding to USB. I'm not sure if it was a bad batch or what happened. It was promptly replaced with a new one. So far so good. I will update a review in the replaced purchase item listing. These boards are a great way to implement controllers, into a tiny project case. UPDATE: The new board works great. Have had no problems. I would highly recommend this board to anyone that needs a microcontroller that fits into a small project enclosure. I will be buying more, for future projects.
Review: My go to for sooo many reasons - I bought 3 of these a couple years ago to play around with. At the time, it was just because they were cheap and quick to get on desertcart. I quickly fell in love. Though they aren't perfect. Pros: Size. They're tiny. Even 2 years on, most microcontrollers are *at least* 2 to 4 times the size. The small size makes them easy to fit into almost any project. They're literally the size of a postage stamp. I can cover one with my finger. Which brings me to the next pro: I/O. Even at this tiny size, you still have tons of I/O, with support for hardware interrupts, UART, I2C, SPI, and true analog pins with DAC. The big one for me, though, is HID support through the USB type C port. That's a much less common feature than you'd think. If you want to make devices that can talk to other devices as an input device, you need this. Speed. You don't really think that a simple Arduino device needs to be fast, but having a 48mhz processor and 32mb of SRAM to work with open up a LOT of possibilities. Take, for example, my most recent project. I wanted to make a vintage laptop keyboard work with a modern laptop motherboard. But I wanted to do so without damaging the original keyboard. So to interface the two, I needed the Xiao to be able to read the PS/2 protocol that the keyboard was talking in, and give USB HID protocol commands to the computer. Reading the PS/2 protocol takes very precise timing. Your code has to execute within a certain number of microseconds, otherwise the command will fail. Because of the speed of the processor, I could have more code executing in the interrupts while still staying under the threshold. Cons: Storage. While I've never run up against the limit, the Xiao has 256 kB of flash memory. That's not the smallest, but it's certainly not the biggest I've seen on a microcontroller. So I do get a little nervous when I start importing a bunch of libraries. So far, my most involved project, the keyboard that I talked about earlier, only uses about 25% of that storage. And that's importing two different libraries plus my custom code. But if you have a large project that takes many libraries or a whole lot of code, you might run into problems with storage. Bootloader Corruption. I've only had it happen once and it was after hundreds upon hundreds of code uploads. These guys saying they're bricking after 50 uploads have to be doing something wrong. Or maybe it's because they're on Mac hardware, I don't know. But I've had to upload 50 times pretty much everyday I've worked on this project and so far it's not been a problem. But like I said, I did have one of my original three stop responding to USB. So the problem does exist. The device itself still does what the last upload of code told it to do, but I can no longer get it to talk with the Arduino software. And resetting the unit didn't resolve it. So you're mileage may vary.

## Features

- 🌱【Powerful CPU】 The Seeeduino XIAO is equipped with an ARM Cortex-M0+ 32bit 48MHz microcontroller, which is three times faster than Arduino Uno and Arduino Nano. Furthermore, this Arduino IDE compatible board XIAO has 256KB flash memory and 32KB SRAM.
- 🌱【Rich Interfaces in a Tiny Size】 The device has 14 GPIO pins, each of which has 11 analog channels, 11 digital channels, I2C*1, UART*1, and SPI*1, USB Type-C interface*1 in a tiny space, just 20mm*17.5mm (about the size of your thumb). Seeeduino XIAO is the smallest Arduino compatible board in the Seeeduino series.
- 🌱【Fully compatible with Arduino IDE】 Seeeduino XIAO development board is perfectly compatible with Arduino IDE and you can easily create small projects using the extensive and comprehensive Arduino library. It has a 2.54mm pin pitch and can be used even when inserted into a breadboard because it is an Arduino microcontroller.It has a 2.54mm pin pitch and can be used even when inserted into a breadboard because it is an Arduino microcontroller.
- 🌱【Applications】 Seeeduino XIAO is suitable for Wearable devices, Rapid prototyping, DIY keyboard, USB to multi-channel TTL/USB host mode, etc.
- 🌱【Perfect for Wearable and Tiny Arduino Projects】 This microcontroller has good performance in processing but needs less power. As a matter of fact, it is designed in a tiny size and can be used for Arduino wearable devices and small projects.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08745JBRP |
| Best Sellers Rank | #104 in Single Board Computers (Computers & Accessories) |
| Brand | seeed studio |
| Built-In Media | / |
| CPU Model | None |
| Compatible Devices | Devices compatible with Arduino IDE |
| Connectivity Technology | I2C, UART, SPI, USB |
| Customer Reviews | 4.5 4.5 out of 5 stars (748) |
| Manufacturer | seeed studio |
| Memory Storage Capacity | 256 KB |
| Mfr Part Number | 110010004 |
| Model Name | Seeeduino XIAO |
| Model Number | 110010004 |
| Operating System | Windows, macOS, Linux |
| Processor Brand | ARM |
| Processor Count | 1 |
| Processor Speed | 48 MHz |
| RAM Memory Installed | 32 KB |
| RAM Memory Technology | SRAM |
| Total Usb Ports | 1 |
| UPC | 886268758132 |
| Warranty Description | / |
| Wireless Compability | 802.11b |

## Product Details

- **Brand:** seeed studio
- **CPU Model:** None
- **Memory Storage Capacity:** 256 KB
- **Model Name:** Seeeduino XIAO
- **Ram Memory Installed Size:** 32 KB

## Images

![XIAO SAMD21 - Image 1](https://m.media-amazon.com/images/I/41ednqv7gXL.jpg)
![XIAO SAMD21 - Image 2](https://m.media-amazon.com/images/I/41uR9RpuN1L.jpg)
![XIAO SAMD21 - Image 3](https://m.media-amazon.com/images/I/41BfmdCDLSL.jpg)
![XIAO SAMD21 - Image 4](https://m.media-amazon.com/images/I/3104sqK5TPL.jpg)
![XIAO SAMD21 - Image 5](https://m.media-amazon.com/images/I/41YwHwJsKmL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great Tiny Microcontroller...
*by L***Q on January 27, 2026*

The Xiao was easy to setup in my Arduino IDE. Once I installed the correct "Board" in "Board Managers", I was able to upload code to the chip. Worked great.... for a day. Then the board stopped responding to USB. I'm not sure if it was a bad batch or what happened. It was promptly replaced with a new one. So far so good. I will update a review in the replaced purchase item listing. These boards are a great way to implement controllers, into a tiny project case. UPDATE: The new board works great. Have had no problems. I would highly recommend this board to anyone that needs a microcontroller that fits into a small project enclosure. I will be buying more, for future projects.

### ⭐⭐⭐⭐⭐ My go to for sooo many reasons
*by R***S on May 10, 2021*

I bought 3 of these a couple years ago to play around with. At the time, it was just because they were cheap and quick to get on Amazon. I quickly fell in love. Though they aren't perfect. Pros: Size. They're tiny. Even 2 years on, most microcontrollers are *at least* 2 to 4 times the size. The small size makes them easy to fit into almost any project. They're literally the size of a postage stamp. I can cover one with my finger. Which brings me to the next pro: I/O. Even at this tiny size, you still have tons of I/O, with support for hardware interrupts, UART, I2C, SPI, and true analog pins with DAC. The big one for me, though, is HID support through the USB type C port. That's a much less common feature than you'd think. If you want to make devices that can talk to other devices as an input device, you need this. Speed. You don't really think that a simple Arduino device needs to be fast, but having a 48mhz processor and 32mb of SRAM to work with open up a LOT of possibilities. Take, for example, my most recent project. I wanted to make a vintage laptop keyboard work with a modern laptop motherboard. But I wanted to do so without damaging the original keyboard. So to interface the two, I needed the Xiao to be able to read the PS/2 protocol that the keyboard was talking in, and give USB HID protocol commands to the computer. Reading the PS/2 protocol takes very precise timing. Your code has to execute within a certain number of microseconds, otherwise the command will fail. Because of the speed of the processor, I could have more code executing in the interrupts while still staying under the threshold. Cons: Storage. While I've never run up against the limit, the Xiao has 256 kB of flash memory. That's not the smallest, but it's certainly not the biggest I've seen on a microcontroller. So I do get a little nervous when I start importing a bunch of libraries. So far, my most involved project, the keyboard that I talked about earlier, only uses about 25% of that storage. And that's importing two different libraries plus my custom code. But if you have a large project that takes many libraries or a whole lot of code, you might run into problems with storage. Bootloader Corruption. I've only had it happen once and it was after hundreds upon hundreds of code uploads. These guys saying they're bricking after 50 uploads have to be doing something wrong. Or maybe it's because they're on Mac hardware, I don't know. But I've had to upload 50 times pretty much everyday I've worked on this project and so far it's not been a problem. But like I said, I did have one of my original three stop responding to USB. So the problem does exist. The device itself still does what the last upload of code told it to do, but I can no longer get it to talk with the Arduino software. And resetting the unit didn't resolve it. So you're mileage may vary.

### ⭐⭐⭐⭐⭐ Awesome tiny microcontroller!
*by J***A on November 13, 2022*

This tiny microcontroller is great for small projects. Actually, it's quite powerful for what it is and has plenty of I/O pins. My son uses it for Star Wars props and Cosplay. It's great for wearables, controlling LEDs, and just about anything an Arduino can do but just more. The setup can be a little confusing at first, but the documentation on the SeedStudio site is really good. It will walk you through with setting up the Arduino IDE or setting up Circuit Python, since the setup is very different from each other. I've programmed this little microcontroller with both the Arduino IDE and with Circuit Python. Circuit Python might be more beginner friendly. I really like that it has USB Type-C connector because then I can use the same cable as my Mobile Phones. It's annoying to have so many different cables around. One thing to make note is that these microcontrollers are not 5v tolerant. Yes, you can power it with 5 volts, but the inputs and outputs are 3.3 volts. The one thing I wish it had was a reset button, but it's so small I'm sure it would be impossible to fit. You can add a reset button because there are soldering pads for it, but it doesn't have one on the board it self. So, if you are making wearables this would be great. Actually, you can use it to control servos, led light strips, and a ton more. It even has a DAC so you can technically make it produce sound too!

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---

*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-04-23*