Love FLORA but want a bite-sized version? Look no further, GEMMA is a tiny wearable platform board with a lot of might in a 1" diameter package. Powered by a Attiny85 and programmable with an Arduino IDE over USB, you'll be able to realize any wearable project!

We wanted to design a microcontroller board that was small enough to fit into any project, and low cost enough to use without hesitation. Perfect for when you don't want to give up your Flora and you aren't willing to take apart the project you worked so hard to design. It's our lowest-cost sewable controller!

NEW In version 2! On March 4, 2015 we released Version 2, which is physically and code-wise identical but has changed the Mini-B connection for a Micro-B USB connector and adds a much-requested On-Off switch!


The Attiny85 is a fun processor because despite being so small, it has 8K of flash, and 5 I/O pins, including analog inputs and PWM 'analog' outputs. We designed a USB bootloader so you can plug it into any computer and reprogram it over a USB port just like an Arduino (it uses 2 of the 5 I/O pins, leaving you with 3). In fact we even made some simple modifications to the Arduino IDE so that it works like a mini-Flora. Perfect for small & simple projects the GEMMA will be your go-to wearable electronics platform.

Even though you can program GEMMA using the Arduino IDE, it's not a fully 100% Arduino-compatible. There are some things you trade off for such a small and low cost microcontroller!

  • 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 GEMMAs bootloader. Simply use a USB v2 port or a USB hub in between

Here are some useful specifications!

  • Super small, only 1.1" / 28mm diameter and 0.28" / 7mm thick.
  • Easy-to-sew or solder pads for embedding in your wearable project
  • Low cost enough, you can use one for every weekend project
  • ATtiny85 on-board, 8K of flash, 512 byte of SRAM, 512 bytes of EEPROM
  • Internal oscillator runs at 8MHz
  • Ultra low power, draws only 9 mA while running
  • USB bootloader with a nice LED indicator looks just like a USBtinyISP so you can program it with the Arduino IDE (with a few simple config modifications)
  • Micro-USB jack for power and/or USB uploading, you can put it in a box or tape it up and use any USB cable for when you want to reprogram.
  • We really worked hard on the bootloader process to make it rugged and foolproof
  • ~5.25K bytes available for use (2.75K taken for the bootloader)
  • On-board 3.3V power regulator with 150mA output capability and ultra-low dropout. Up to 16V input, reverse-polarity protection, thermal and current-limit protection.
  • Power with either USB or external output (such as a battery) - it'll automatically switch over
  • On-board green power LED and red pin #1 LED
  • Reset button for entering the bootloader or restarting the program.
  • 3 GPIO - The 3 independent IO pins have 1 analog input and 2 PWM output as well.
  • Hardware I2C capability for breakout & sensor interfacing.

For more information about GEMMA, check our out Learn guide

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  • Dimensions: 27.98mm / 1.1" round x 7.14mm / 0.28" high
  • Weight: 3.29g

Datasheets, EagleCAD PCB files, firmware, Fritzing object and more available in the product tutorial

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NeoPixel Ring Bling
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Inspired by Iron Man's Arc Reactor!
Wear a constellation with NeoPixels & GEMMA
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Build a Fabulous LED Hair Dress
Design and 3D Print a custom tree topper
Build a sound reactive LED microphone flag
Make glowy buttons for apparel
Wear a crown of LEDs for your birthday or prom!
Wear your heart on your... lapel!
Make your own adorable BMO with a mini 8x8 LED Matrix and Gemma.
Light up your mini or full sized basketball hoop with Gemma and NeoPixels.
3D printed NinjaFlex Electronic Fashion
Make any toy make simple sound!
Stitch some sparkle into your next wearable
Make a low-budget, thermal camera for scientific analysis, or just some awesome cosplay.
GEMMA + LED studs
Program your FLORA in your browser!
They see me rolling, bootloading!
Surpise your friends with a mother ship on your head, Spielberg style.
Calibrate sensors on GEMMA and Trinket!
Intro to electronics for cosplayers, no prior experience required
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Print your things for your halloween costumes!
Shoot powerful LED lights, from your chest!
It’s got lasers, EL wire and of course, NeoPixel LEDs.
Canine costume fun
Bullets of pure love
Make a GEMMA and NeoPixel Pixie Dust Bag
Jump around, jump up and get down!
Light up the dystopian future
Conductive thread zip-trigger
Creating your own cyborg terror
Wrap up in light and motion
All-sewn slide-sensor circuit
Bring out your inner geisha with this Neopixeled chopstick kanzashi.
Setup the Arduino IDE to work with Trinket, Gemma, Flora, and more!
Adding a smartphone interface to your wearable project couldn't be easier!
Customize a Flashflight or other suitable flying disc, and throw blinky programs at your friends.
feel the passage of time
LED candles are very popular but can be expensive and unrealistic. Why not make your own?
Turn a Tiki torch into a beautiful animated LED light display.
Glowing majesty two ways
Light up the party!
Glowing NeoPixel Jewel Eyes
Your new favorite LED sneakers
3D print a classic power-up and bring it to life with GEMMA powered NeoPixel LEDs
Make this sound reactive NeoPixel LED peace pendant and help radiate some love!!
Wearable-friendly illuminated controls for your project
Ground yourself in Burner Style
Attach an LED in the palm of your hand!
Create a stunning piece of jewelry with this easy project.

(AF-1222)

SKU AF-1222
Brand Adafruit

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