Seeed Studio Studio Seeeduino XIAO SAMD21 (Pre-Soldered)
Seeed Studio Studio Seeeduino XIAO SAMD21 (Pre-Soldered) - Image 2
Seeed Studio Studio Seeeduino XIAO SAMD21 (Pre-Soldered) - Image 3
SKU: IOWC-1427
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Seeed Studio Studio Seeeduino XIAO SAMD21 (Pre-Soldered)

₹799.00 (Inclusive of all taxes)
Out of Stock

The Seeeduino XIAO SAMD21 is an ultra-compact ARM Cortex-M0+ development board pre-soldered for rapid prototyping. It is fully compatible with the Arduino IDE and features a USB Type-C interface for power and programming, making it ideal for wearable devices and space-constrained IoT projects.

Features

  • Ultra-Compact Form Factor: Measures just 20 x 17.5 mm, making it perfect for wearable electronics and miniaturized projects.
  • Powerful SAMD21G18 MCU: Features an ARM Cortex-M0+ processor running at 48 MHz with 256KB Flash and 32KB SRAM for capable edge processing.
  • Arduino IDE Compatible: Seamlessly integrates with the Arduino ecosystem for rapid development using a vast library of existing code and examples.
  • Rich I/O on Minimal Footprint: Provides 14 GPIO pins supporting 11 analog/digital pins, 10 PWM outputs, and dedicated I2C, UART, SPI, and a true analog DAC output.
  • USB Type-C & Battery Power: Features a modern USB Type-C connector for programming and power, plus rear solder pads for direct battery connection.

Out of stock

Description

The Seeeduino XIAO SAMD21 is a meticulously engineered, thumb-sized development board built around the low-power yet capable ARM Cortex-M0+ (SAMD21G18) microcontroller. It delivers a full-featured Arduino-compatible experience in a footprint designed for wearable tech and embedded systems where space is at a premium. The board includes a stable external 32.768 kHz crystal for accurate timing, a user-programmable LED, and a SWD debug interface pad for advanced firmware development.

Despite its size, it offers a comprehensive suite of interfaces including SPI, I2C, UART, and a true Digital-to-Analog Converter (DAC) on pin A0, enabling genuine analog signal generation beyond standard PWM. The pre-soldered headers ensure immediate breadboard compatibility, while the USB Type-C port simplifies both power delivery and code uploading. Rear battery pads facilitate untethered operation, solidifying its role in portable and battery-powered IoT applications.

Key Features

  • ARM Cortex-M0+ Core: Leverages the energy-efficient SAMD21G18 running at 48 MHz for responsive control in low-power applications.
  • Arduino Ecosystem Integration: Fully supported within the Arduino IDE with dedicated board definitions and core libraries.
  • High-Density I/O Design: Maximizes functionality with multi-role pins providing analog inputs, digital I/O, PWM, and hardware serial/peripheral interfaces.
  • True Analog Output: Features a dedicated Digital-to-Analog Converter (DAC) pin for generating precise analog voltage signals.
  • Enhanced Timing Stability: Incorporates an external 32.768 kHz crystal oscillator for improved clock accuracy compared to internal RC oscillators.
  • Developer-Friendly Design: Includes a user LED for debugging and exposed SWD bonding pads for direct programming and debugging with compatible tools.
  • Dual Power Options: Powered via the modern USB Type-C port or through solder pads on the back for direct connection to a LiPo or other battery sources.

Applications

  • Wearable Electronics and Smart Gadgets: Ideal for fitness bands, smart jewelry, and compact health monitors due to its tiny size and battery support.
  • Rapid Prototyping & Minimal Systems: Can be directly soldered onto a custom PCB as a compact, programmable core module.
  • DIY Input Devices: Perfect for building custom macro keyboards, MIDI controllers, or HID projects leveraging its native USB capability.
  • Sensor Hub & Data Logging: Capable of reading multiple analog sensors simultaneously and logging data, aided by the DAC for signal generation.
  • Educational & Maker Projects: An excellent entry point for learning embedded systems and Arduino programming in a space-constrained format.

Technical Specifications

Microcontroller / SoCARM Cortex-M0+ (SAMD21G18)
CPU Frequency48 MHz
Flash Memory256 KB
SRAM32 KB
Digital I/O Pins11
Analog Input Pins11
PWM Pins10 (A1/D1 to A10/D10)
DAC Output1 (Pin A0/D0)
InterfacesI2C, UART, SPI, SWD
USB ConnectorType-C
Supply Voltage5V via USB, 3.3V via regulator
Dimensions20 mm x 17.5 mm
WeightApprox. 10 g

Frequently Asked Questions

How do I set up the Seeeduino XIAO SAMD21 with the Arduino IDE?

First, install the Arduino IDE and add the Seeed Studio SAMD Boards core via the Boards Manager using the URL provided on Seeed Studio's wiki. Select 'Seeeduino XIAO' from the board list under the 'Seeed Studio SAMD' section. Connect the board via USB-C, ensure the correct COM port is selected, and you can begin uploading sketches. The board appears as a native Arduino Zero variant, granting access to all standard Arduino functions and libraries for the SAMD21 architecture.

Can I power the XIAO board with a battery, and how is it connected?

Yes, the XIAO supports battery power via the 'BAT+' and 'GND' solder pads located on the back of the board. You can solder wires directly to these pads to connect a single-cell LiPo battery (3.7V nominal) or other 3.3V-5V DC sources. The onboard voltage regulator will manage the input. This feature is essential for creating untethered, portable wearable devices or remote sensors where USB power is not available.

What is the function of the DAC pin, and how do I use it?

Pin A0/D0 features a true Digital-to-Analog Converter (DAC). Unlike PWM, it outputs a genuine, smooth analog voltage between 0V and 3.3V. To use it, define the pin as an output in your Arduino sketch and employ the 'analogWrite()' function with a value from 0 to 1023 (for 10-bit resolution) to set the voltage. This is ideal for driving analog gauges, generating audio waveforms, or providing precise reference voltages for other circuits.

What are the available interfaces for connecting sensors and peripherals?

The XIAO provides dedicated hardware interfaces: one I2C (on pins D4/SDA and D5/SCL), one UART (on pins D6/TX and D7/RX), and one SPI (using pins D8/COPI, D9/CIPO, D10/SCK). These are in addition to its 11 multi-function GPIO pins, which can serve as digital I/O, analog inputs, or PWM outputs. This comprehensive set allows for easy connection of displays, GPS modules, SD cards, and a wide array of sensors without bit-banging software protocols.

Package Includes

  • 1 x Seeed Studio Studio Seeeduino XIAO SAMD21 Board (Pre-Soldered)

Additional Information

Weight 0.01 kg
Dimensions 2 × 1.75 cm

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