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Description
SparkFun SAMD21 Mini BreakoutDEV 13664 If youre ready to step your Arduino game up from older 8 bit 16MHz microcontrollers, the SparkFun SAMD21 Mini Breakout is a great landing spot. The SAMD21 Mini Breakout is a Pro Mini sized breakout for the Atmel ATSAMD21G18, a 32 bit ARM Cortex M0+ processor with 256KB flash, 32KB SRAM, and an operating speed of up to 48MHz. This mini breakout provides you with an Arduino hardware option that solves the problems of low storage limits and
DEV-13664
If you’re ready to step your Arduino game up from older 8-bit/16MHz microcontrollers, the SparkFun SAMD21 Mini Breakout is a great landing spot. The SAMD21 Mini Breakout is a Pro Mini-sized breakout for the Atmel ATSAMD21G18, a 32-bit ARM Cortex-M0+ processor with 256KB flash, 32KB SRAM, and an operating speed of up to 48MHz. This mini breakout provides you with an Arduino hardware option that solves the problems of low storage limits and dynamic memory stack overflows that have plagued the previous iterations of the Arduino family. Yes, the SparkFun SAMD21 Mini Breakout is even fully supported in the Arduino IDE and libraries for the Arduino Zero!
The SparkFun SAMD21 Mini Breakout has been equipped with a USB interface for programming and power, surrounded with an RTC crystal, and a 600mA 3.3V regulator. By utilizing the Pro R3’s extra PCB real-estate we’ve been able to leave room for a few extra GPIO pins. We’ve pinned the Mini Breakout to match – as much as possible – our faithful Pro Mini and Pro Micro. The I/O and voltage rails are all broken out to a pair of breadboard-compatible headers. Power can be supplied, and the board can be programmed, through the micro-B USB connector.
One of the most unique features of the SAMD21 is SERCOM – a set of six configurable serial interfaces that can be turned into either a UART, I2C master, I2C slave, SPI master, or SPI slave. Each SERCOM provides for a lot of flexibility: the ports can be multiplexed, giving you a choice of which task each pin is assigned.
The on-line SAMD21 Mini/Dev Breakout Hookup Guide (in the Documents section below) contains step by step instructions of how to connect your SparkFun SAMD21 Mini Breakout as well as a few circuit examples to test out. Full example code is provided and explained and even includes troubleshooting tips to make make you have zero problems.
Note: The breakout does NOT have headers installed and will need to purchased and soldered on yourself. Check the Recommended Products section below for the type of headers we use in the Hookup Guide!
Features
- ATSAMD21G18 32-bit/48MHz ARM Cortex-M0+
- 256KB Flash Memory
- 32KB SRAM
- 32KB of EEPROM (emulated in Flash)
- 22 GPIO Count
- 14 ADC Channels at 12-bit Resolution
- Analog-to-Digital and Digital-to-Analog Converters (ADC & DAC)
- RAW: 3.5V-6.0V
- VCC: 600mA @3.3V
- Pro Mini/Micro Layout
- Integrated USB Controller
Documents
- Schematic
- Eagle Files
- Hookup Guide
- Graphical Datasheet
- Datasheet (ATSAMD21G18)
- GitHub (Design Files)
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Product Reviews
★★★★★ 5
small pillowcase
Color: Black, Size: Zippered 13x18 Inch (Pack of 2)
my son likes the color and zipper with it. easy to wash.
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Reviewed in the United States on May 23, 2026
★★★★★ 5
Soft material
Color: Sky Blue, Size: Envelope 14x20 Inch (Pack of 2)
Soft material, nice color and just the right size. No zippers if using for children is a good safety feature. Very nice.
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Reviewed in the United States on March 29, 2026
★★★★★ 4
Khaki?
Color: Khaki, Size: Zippered 13x18 Inch (Pack of 2)
Nice quality and construction. Khaki is brown though.
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Reviewed in the United States on April 9, 2026
★★★★★ 5
Soft Microfiber Fabric
Color: Khaki, Size: Zippered 13x18 Inch (Pack of 2)
Khaki color appears more dark peach than khaki. Very soft good quality fabric. Excellent value for the price.
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Reviewed in the United States on April 21, 2026
★★★★★ 5
Adorable and Snug
Color: Dark Grey, Size: Zippered 13x18 Inch (Pack of 2)
They fit the toddler pillows perfectly! Zero shrinkage in the wash and hasn’t held any stains. The color looks rich and hasn’t faded. Very soft and the zipper closure doesn’t stick out at all! Will buy more!
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Reviewed in the United States on February 12, 2026
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