Adafruit GEMMA Miniature Wearable Electronic Platform


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About this product


  • Start your wearables project with the Adafruit Gemma
  • Arduino IDE is a simple software platform used by the Adafruit Gemma to upload your code
  • Can be powered using a USB-Mini or an external Li-Po Battery

Product overview

• Start your wearables project with the Adafruit Gemma
• Arduino IDE is a simple software platform used by the Adafruit Gemma to upload your code
• Can be powered using a USB-Mini or an external Li-Po Battery
• Even on such a tiny board they’ve managed to squeeze in 3 Digital I/O Pins, 2 of which are PWM and one Analogue In
• Using Arduino code for the Adafruit Gemma has never been easier, with thousands of tips, tricks and guides readily available online
• Hardware I2C capability for breakout & sensor interfacing

Reasons to pick the Adafruit Gemma?
With the Adafruit Gemma, one of the smallest open-source Arduino based boards around. Start any electronics, coding or wearables projects readily available in the huge Maker community, or design one yourself.

The Adafruit Gemma, despite its size, still packs a punch using an ATtiny85, and still having 3 I/O pads to work with. The best bit about the Adafruit Gemma, is not just its miniscule size, it’s the ability to Solder, or even sew the conductive connectors. You can sew your electronics projects directly into fabrics safely, relieving the need to solder while still producing the same finish.

Connections and Expansion
The Adafruit Gemma has 3 Digital I/O pins, allowing you to control numerous components at once. This board fits perfectly within Adafruit’s 16 LED NeoPixel ring meaning your small LED projects, can stay small.

Where the Adafruit Gemma doesn’t support shields, it can utilise break out boards, which are like tiny shields that link together just as easy usually providing more specific uses. Breakouts allow you to more easily manage a lot of components in any project.

You can view our range of breakouts and other Arduino/Adafruit related accessories by clicking Here.

What will you make?
In recent years wearable technology has caught a lot of attention and is vastly expanding and growing in the Maker community.
Wearable technology can be crazy, kooky, and fun, as well as helping us to make our work and lives easier through greater communication and increased functionality.

With the ever expanding range of tutorial guides available, you can start by telling a single LED to flash, or control a stepper motor’s speed and direction.
Using coding languages called C/C++, these skills easily translate to most general software languages, and so with this you’ll be learning a lot more than electronics.

Ease of Use
Arduino based Electronics is fantastic for all ages, whether you have previous experience or not, from fun to functional.
Tutorials will tell you exactly what you will need, even what pins to connect your components into, giving you a step by step, start to finish.
Using the Arduino IDE Software, it will allow you to very easily update your Adafruit Gemma with the code you’ve prepared, making the transfer seamless; it will even let you know whether your code makes sense and will work before you even upload it.

Start by;
making a Light up bracelet,
Or a little Chirping Owl,
Then go on to start your Superhero reign!

Arduino IDE software is needed to program an Adafruit, it’s not in the box. Download from here:
Works on Mac, Windows and Linux based computers including Raspberry Pi's Rasbian software

Arduino's site.

Gemma does not have a Serial port connection for debugging so the serial port monitor will not be able to send/receive data
Some computers' USB v3 ports don't recognize the Gemma's bootloader. Simply use a USB v2 port or a USB hub in between
Gemma is not supported on Linux operating system at this time


Micro Controller ATtiny85
CPU Clock Speed 8 MHz
Operating Voltage 3.3 V
Input Voltage 3.5 V / 9 V
Digital IO/PWM 3/2
Analogue In 1 (uses a digital pin)
Programming interface USB
USB Serial Controller USB-Mini
Flash Memory 8 KB
Board Version (if applicable) 1
Special Features JST Battery connector
Connectivity Sewable/solderable connector pads
Dimensions 22 mm x 22 mm x 7 mm

How many neopixels can this drive?

Asked by: hairyone
The link below can provide more information on the item
Answered by: Dominic
Date published: 2016-01-07
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