Seeeduino
Seeeduino XIAO
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Thumb-size SAMD21 development board with headers already soldered. Seeed Studio XIAO SAMD21 (pre-soldered, MPN 102010388) gives you an Arduino-compatible ARM Cortex-M0+ board in a compact 21 × 17.8 mm footprint.
Why this board
- Ready to plug into a breadboard: this is the pre-soldered XIAO SAMD21, so the pin headers are already installed.
- Small but useful I/O: 14 GPIO, 11 digital/analog-capable pins, 10 PWM pins, 1 DAC output, I2C, UART, SPI, and SWD pads.
- Arduino-family workflow: supported by Arduino IDE, PlatformIO, MicroPython, CircuitPython, and Zephyr.
- USB-C onboard: one connector for power and programming.
Specifications
- Manufacturer: Seeed Studio
- MPN: 102010388
- MCU: Microchip ATSAMD21G18 / SAMD21G18, ARM Cortex-M0+ up to 48 MHz
- Memory: 256 KB Flash, 32 KB SRAM
- Logic level: 3.3 V I/O
- Power input: USB Type-C 5 V or regulated 5 V input
- Dimensions: 21 × 17.8 mm class XIAO footprint
Use it for
- Small Arduino-compatible embedded projects, wearables, keyboard/macropad electronics, fixtures, and sensor experiments.
- Projects that need a tiny USB-C SAMD21 board without soldering headers first.
Gotchas
- 3.3 V logic only: do not drive the GPIO pins above 3.3 V.
- This is the pre-soldered XIAO SAMD21, not the unsoldered 102010328 board and not a wireless ESP32 / nRF XIAO variant.
- The board does not include battery charging or battery protection circuitry; use an external power-management module for LiPo/Li-ion projects.
Shipping & Returns
Returns:
Thank you for purchasing from dfh.fm. I want you to be completely satisfied with your purchase. If for any reason you are not satisfied, you may return your purchase within 60 days of the original purchase date.
Defective items: Please inspect items upon receipt. If you receive a defective item, you may return it for a full refund or replacement within 90 days of the original purchase date. Please contact me to initiate a return for a defective item.
Non-defective items: If you are not satisfied with a non-defective item, you may return it for a refund within 30 days of the original purchase date. A 20% restocking fee will be deducted from the refund amount, to offset the time and inconvenience, as I am the sole employee processing the return and restocking the item. The fee also covers the costs associated with processing the return. Refunds for non-defective items will be issued through the original payment method.
Preordered items: Due to the nature of preorders, delivery dates are subject to change. Please keep in mind that, If you have preordered an item, it is not eligible for a refund until after it has arrived at the store. Once the item arrives at the store and is inspected, you may request a refund within 30 days of the original purchase date. Please note that refunds for preordered items may take up to 10 days to be issued.
To initiate a return, please open a ticket on the shop’s discord channel, with your order number and the reason for the return. We will provide you with further instructions on how to return your purchase.
Thank you for shopping with us. If you have any questions or concerns, please don't hesitate to contact me, via Discord.
Order alterations and cancellations:
Once an order has ben submitted, no alterations can be made. This includes adding or removing items or canceling orders. You are welcome to return an order, once you have taken receipt, following the returns procedure listed above.
Shipping:
US Shipping is via UPS or USPS. The way it is set up shows the least expensive options for standard, priority and express shipping. I can not take special requests for specific carriers at this time.
International shipping is mostly UPS, as I utilize Zonos/UPS integration to tally extremely accurate import and shipping costs.
I require a telephone and email with international orders and you must make yourself available to the carrier or your customs, should they require more information. If you are unreachable and the package is discarded or rerturned, I will not be responsible for rerturning your shipping cost.
If there is a problem with an international order, it is my choice to refund part or all of the order, or send a replacement.
Addresses are verified through Shopify, but the customer is still responsible for inputting their address in the correct format. Any returns or lost shipments, due to incorrectly addressed packages, are the responsibility of the customer.
