Close-up of Seeeduino XIAO SAMD21 Arduino board rear view

Seeeduino XIAO SAMD21 Arduino Board Pre-Soldered

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Presoldered Seeeduino XIAO SAMD21, a compact Arduino-compatible board ideal for wearable, IoT and embedded projects; breadboard-friendly for rapid prototyping and low-profile integration.

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Overview

Product Overview

The ShillehTek Seeeduino XIAO SAMD21 Arduino Board (Presoldered) is an ultra-compact, Arduino-compatible microcontroller board built for space-constrained projects like wearables, sensor nodes, and embedded prototypes. With preinstalled headers, it’s ready to plug into breadboards and header sockets for quick wiring and faster iteration. Based on the SAMD21 platform, it works smoothly with the Arduino ecosystem for rapid coding, testing, and debugging, making it a strong choice for classrooms, maker labs, and compact builds where a tiny footprint matters.

At just 21 x 17.8 mm, the XIAO packs a SAMD21G18 Cortex-M0+ running at 48 MHz with 256 KB flash and 32 KB SRAM, a USB-C connector, and 11 multi-function I/O pins covering analog, digital, I2C, SPI, and UART. It programs from the Arduino IDE or CircuitPython, and with ShillehTek's pre-soldered headers it plugs straight into a breadboard - no fiddly soldering on a thumb-sized board.

Questions & answers

Frequently asked questions

Yes. This board is based on the SAMD21 platform and is Arduino-compatible, so it is intended for use with the Arduino ecosystem for coding, testing, and debugging compact embedded projects.
The board comes with headers already soldered, so it can plug into breadboards or compatible header sockets without soldering. That makes initial wiring faster for prototypes, classes, and quick hardware tests.
This is a SAMD21-based microcontroller development board. The provided product information identifies it as Arduino-compatible but does not specify exact voltage levels, pin functions, or current limits, so verify those details against the official Seeeduino XIAO SAMD21 documentation.
It is well suited for space-constrained projects such as wearables, sensor nodes, and embedded prototypes. Its ultra-compact format helps when a full-size development board would take too much space in the enclosure.
Choose this pre-soldered version if you want to avoid soldering headers yourself or need a board that can go directly into a breadboard. For wiring problems, first confirm header seating and Arduino board support settings.

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What's included

Features & Specs

SAMD21 Arduino Platform Reliable Arduino-compatible core for embedded and maker development.

XIAO Ultra-Compact Size Tiny footprint for wearables, tight enclosures, and minimal builds.

Plug-In Setup Headers are installed so you can start wiring and testing immediately.

Sensor and Module Friendly Great for I2C, SPI, UART peripherals like IMUs, OLEDs, GPS modules, and sensors.

Rapid Firmware Iteration Easy code-upload workflow for quick testing, tuning, and debugging.

Great for Learning and Labs Ideal for classrooms, workshops, and repeatable kit builds.

Project Versatility Works well for automation, data logging, simple robotics, and portable prototypes.

Reference

Documents

Full Product Manual ShillehTek Seeeduino XIAO SAMD21 Arduino Board Presoldered | ShillehTek Product Manual In-depth setup guide with wiring, code examples, and troubleshooting.

Datasheet

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