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GEMMA - Miniature wearable electronic platform

Adafruit 1222

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ID: 210896



12,21€ gross (23% VAT)
9,93€ net

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Data sheet

Flash memory8kB
EEPROM memory512B
Number of digital pins3
Number of PWM channels2
Ilość wejść analogowych1
ADC1x 10bit
WiFi/BT moduleNo
Bluetooth moduleNo
GSM/GPRS moduleNie
Logic voltage3,3 V
MicroSD slotNo
Supply voltage min3,3 V
Supply voltages max5 V

More info

GEMMA - Miniature wearable electronic platform

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, youll 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 dont want to give up your Flora and you arent willing to take apart the project you worked so hard to design. Its our lowest-cost sewable controller!

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, its 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 dont recognize the GEMMAs bootloader. Simply use a USB v2 port or a USB hub in between
  • Trinket is not supported on Linux operating system at this time - try Mac OS or Windows!
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)
  • Mini-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 or 5.0V 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) - itll 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

Adafruit Gemma - Miniature wearable electronic platform (13:47)

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

Tutorials on the Adafruit Learning System featuring this product:
Gemma 3D Printed Tree Topper
Design and 3D Print a custom tree topper
Gemma-Powered NeoPixel LED Sound Reactive Drums
Light up your drums with sound.
3D Printed NeoPixel Ring Hair Dress
Build a Fabulous LED Hair Dress
Trinket / Gemma Blinky Eyes
Spook up your Halloween item with Blinky Eyes
3D Printed LED Buckle
Combine Gemma & 3D printing for your very own glowy wearables project
Space Face LED Galaxy Makeup
Wear a constellation with NeoPixels & GEMMA
Superhero Power Plant
Inspired by Iron Mans Arc Reactor!
Trinket / Gemma Space Invader Pendant
Itsy bitsy electronic jewelry!
GEMMA Hoop Earrings
NeoPixel Ring Bling
Introducing Gemma
Introducing Adafruits mini wearable microcontroller
Kaleidoscope Eyes (Trinket-Powered NeoPixel LED Ring Goggles)
Fashion headwear for cyberpunks, steampunks and Daft Punks.