Quick answer
XIAO SAMD21 is a development board from Seeed Studio, listed under IoT. It uses the SAMD21G18 on a SAMD core. It carries 256KB flash, 32KB RAM, 14 GPIO. Official framework support: Arduino, PlatformIO, MicroPython, CircuitPython. A 21x17.8 mm SAMD21 board with 14 GPIO and one DAC, aimed at Arduino beginners, sensor nodes and small wearables.
- Vendor
- Seeed Studio
- Architecture
- SAMD
- MCU
- SAMD21G18
- Clock
- 48MHz
- Flash
- 256KB
- RAM
- 32KB
- GPIO
- 14
- Current draw
- 5V USB-C
- Focus
- IoT
Common questions
What is the XIAO SAMD21 development board?
XIAO SAMD21 is a development board from Seeed Studio, listed under IoT. It uses the SAMD21G18 on a SAMD core. It carries 256KB flash, 32KB RAM, 14 GPIO. Official framework support: Arduino, PlatformIO, MicroPython, CircuitPython. A 21x17.8 mm SAMD21 board with 14 GPIO and one DAC, aimed at Arduino beginners, sensor nodes and small wearables.
What MCU and instruction architecture does XIAO SAMD21 use?
SAMD21G18 on a SAMD core.
How much flash and RAM does XIAO SAMD21 have?
It carries 256KB flash, 32KB RAM, 14 GPIO.
What kind of projects is XIAO SAMD21 meant for?
ZouIC lists it under IoT, with official framework support for Arduino, PlatformIO, MicroPython, CircuitPython.
How much power does XIAO SAMD21 draw?
The listed figure is 5V USB-C.
Where can I find official material for XIAO SAMD21?
See the official community at https://wiki.seeedstudio.com/Seeeduino-XIAO/; the purchase page at https://www.seeedstudio.com/Seeeduino-XIAO-Arduino-Microcontroller-SAMD21-Cortex-M0+-p-4426.html.
XIAO SAMD21
A 21x17.8 mm SAMD21 board with 14 GPIO and one DAC, aimed at Arduino beginners, sensor nodes and small wearables.
Quick specs
From vendor docsPeripherals
Frameworks
Technical Specifications
Processor info
Storage and memory
Official links and data notes
Specifications are compiled from public vendor materials for selection reference only. Licenses for hardware design files and documentation are determined by the vendor or project owner; ZouIC does not grant them.
Last verified 2026-10-28
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