---
product_id: 220476395
title: "XIAO SAMD21"
brand: "seeed studio"
price: "$78573"
currency: COP
in_stock: null
reviews_count: 8
category: "Seeed Studio"
url: https://www.desertcart.co/products/220476395-xiao-samd21
store_origin: CO
region: Colombia
---

# 48MHz CPU Speed 20mm x 17.5mm Size USB Type-C Interface XIAO SAMD21

**Brand:** seeed studio
**Price:** $78573
**Availability:** ❌ Out of Stock

## Summary

> 🌟 Small Size, Big Ideas!

## Quick Answers

- **What is this?** XIAO SAMD21 by seeed studio
- **How much does it cost?** $78573 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.co](https://www.desertcart.co/products/220476395-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

- • **🔗 Connect with Ease:** Enjoy a rich array of interfaces including 14 GPIO pins, I2C, UART, and SPI, all in a compact design.
- • **💡 Compact Powerhouse:** At just 20mm x 17.5mm, this microcontroller packs a punch without taking up space.
- • **🌍 Ideal for Wearables:** Designed for low power consumption, making it the go-to choice for wearable tech and tiny projects.
- • **🚀 Unleash Your Creativity:** Experience lightning-fast processing with a 48MHz ARM Cortex-M0+ microcontroller, perfect for innovative projects.
- • **🛠️ Arduino IDE Compatible:** Seamlessly integrate with the Arduino IDE for effortless project development and access to a vast library.

## Overview

The Seeeduino XIAO SAMD21 is the smallest Arduino-compatible microcontroller, featuring a powerful 48MHz ARM Cortex-M0+ processor, 256KB flash memory, and 32KB SRAM. With a compact design and rich interfaces, it's perfect for a variety of applications, including wearables and rapid prototyping, all while being fully compatible with the Arduino IDE.

## Description

desertcart.com: Seeed Studio XIAO SAMD21 - Smallest Arduino Compatible Microcontroller with Rich Interfaces, 1pc : Electronics

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.
Review: Awesome tiny microcontroller! - 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!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08CN5YSQF |
| Best Sellers Rank | #132 in Single Board Computers (Computers & Accessories) |
| Brand | seeed studio |
| Built-In Media | / |
| Compatible Devices | Arduino-compatible devices |
| Connectivity Technology | GPIO, I2C, USB |
| Customer Reviews | 4.4 out of 5 stars 735 Reviews |
| Item Dimensions L x W x H | 0.83"L x 0.69"W x 0.83"H |
| Item Height | 21 millimeters |
| Manufacturer | seeed studio |
| Memory Storage Capacity | 256 KB |
| Model Name | Seeed Studio XIAO SAMD21 |
| Operating System | Windows, macOS, Linux |
| Processor Brand | Microchip Technology |
| Processor Count | 1 |
| Processor Speed | 48 MHz |
| RAM Memory Installed | 32 GB |
| RAM Memory Technology | LPDDR3 |
| Total Usb Ports | 1 |
| UPC | 886268644572 |
| Warranty Description | / |
| Wireless Compability | Bluetooth |

## Product Details

- **Brand:** seeed studio
- **CPU Speed:** 48 MHz
- **Memory Storage Capacity:** 256 KB
- **Model Name:** Seeed Studio XIAO SAMD21
- **Ram Memory Installed Size:** 32 GB

## Images

![XIAO SAMD21 - Image 1](https://m.media-amazon.com/images/I/61diwnhMI0L.jpg)

## Available Options

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

## Questions & Answers

**Q: Can i attach voltage in to the 5v pin? i'm trying to put this on a pcb. will it have the same voltage regulation?**
A: As a previous contributor wrote: a lot of people answering questions here do not know what they are talking about! So here is the answer copied straight from the Seeed Studio webpage regarding this board:
"Note
For general I/O pins: Working voltage of MCU is 3.3V . Voltage input connected to general I/O pins may cause chip damage if it' higher than 3.3V .
For power supply pins: The built-in DC-DC converter circuit able to change 5V voltage into 3.3V allows to power the device with a 5V supply via VIN-PIN and 5V-PIN.
Please pay attention to use, do not lift the shield cover."

**Q: Does this come with a bootloader or not?**
A: yes - I'm pretty sure it does.  Its been a while since I played with it.  But I seem to recall all was needed was to download the necessary Arduino files into the Arduino programming system and make the correct connection to the device.   However be aware the device is finicky in that it needs to be rebooted for programming mode using a jumper wire.  So if you're doing a lot of development/debugging, do that work in a standard Arduino first, and then translate your  debugged program to this device.

**Q: Is the IO 5V tolerant?**
A: From the testing I have done on mine, the pins when being used as an input, are 3.3v tolerant.

**Q: The board can be connected to 5V power supply and simultaneously been conectes to the usb conector from my computer?**
A: There would be a problem if the 5V supply was actually a lower voltage than the USB (which should be 5V). A diode protects everything if the external 5V supply was above 5V (up to the 6V limit of the voltage regulator on the board). To be safe, a diode should be added in series with the external 5V supply. This protection is present in genuine Arduino boards' VIN pin.

## Customer Reviews

### ⭐⭐⭐⭐⭐ 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!

### ⭐⭐⭐⭐⭐ Mostly good, but some quirks.
*by A***E on March 13, 2025*

Very good Stamp sized controller. Best in the series, the ESP32S3 chip is one of the best performers. My application involved an I2S interface to a microphone and four RMT interface outputs to SM2812B leds. Issue #1: The 3.3v regulator on this board has fluctuating output and I need to run my microphone on a separate regulator or I can 'hear' the CPU processing as noise in the microphone. Other arduino boards do not have this issue. The oscilloscope revealed that this chip makes it's power rails rather noisy! Issue #2: Pin 7 (GPIO43) has a part on it that makes the bandwidth poor. This pin isn't usable for high bandwidth control. It's a design choice on their part. Darn good board. Five stars.

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*Product available on Desertcart Colombia*
*Store origin: CO*
*Last updated: 2026-02-22*