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Wearables > Flora

Adafruit GEMMA v2 - Miniature wearable electronic platform

SKU: ADA1222

$14.55 AUD, inc GST
$13.23 AUD, exc GST

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Adafruit GEMMA v2 - Miniature wearable electronic platform
14.55 AUD

SKU: ADA1222

$14.55 AUD, inc GST
$13.23 AUD, exc GST
6 reviews 0 5 4.9
In stock, with a short lead time. 146 units dispatch in 4 to 8 days (in addition to the shipping method you choose). Our timing and stock is accurate. Delivery to you by Wed, 29th of Nov with Express Post within Australia.
Shipping Offer

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!

Adafruit 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 Adafruit's lowest-cost sewable controller!

NEW In version 2! On March 4, 2015 Adafruit 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. Adafruit 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 Adafruit 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.
  • Adafruit 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 Adafruit's out Learn guide













Technical Details

  • 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

This product is listed in:

Documentation and Resources:
  • The Maker Revolution
  • The Maker Revolution celebrates the creation of new devices and the modification of existing ones - the transition from a consumer buying goods to eventually having a major part in their creation. The Maker Revolution places strong emphasis on free (...

Product Comments


Customer Reviews

  1. Review by Kevin verified purchaser
    Rating
    100

    Good alternative for an Arduino if you need to make projects that light up (Posted on 26/10/2017)

  2. Review by Matt verified purchaser
    Rating
    100

    I like my electronics like I like my coffee. Easy to set-up and surprisingly powerful for it's tiny size. (Posted on 3/10/2017)

  3. Review by Simon verified purchaser
    Rating
    100

    Nice. (Posted on 5/07/2017)

  4. Review by Peter verified purchaser
    Rating
    80

    A nice little controller that is easy to hide on a person, only real issue with it is the plug for any small battery packs is not easily obtainable, but you can also just use a USB battery pack to mitigate that problem (Posted on 12/07/2016)

  5. Review by Steve verified purchaser
    Rating
    100

    Paired this with a Neopixel ring, and have been really impressed with this tiny platform. A little bit of set up of the Adruino IDE required which is well documented on the Adafruit learn site. (Posted on 19/06/2016)

  6. Review by Jason verified purchaser
    Rating
    100

    Handy ATTiny package with Lipo and usb connectors. No need to fuss around with ISPs (Posted on 24/03/2016)

We deliver Australia-wide with these options:

  • $3 for Small Items (4-6 days, not tracked, only available on selected small items)
  • $6.95 for Standard Post (2-4 days, tracked)
  • $8.95 for Express Post (1-2 days, tracked)
  • Pickup - Free! Only available to customers who live in the Newcastle region (only after we email you to notify your order is ready)

International Orders - the following rates are for New Zealand and will vary for other countries:

  • $11.49 for Pack and Track (3+ days, tracked)
  • $16.50 for Express International (2-5 days, tracked)

If you order lots of gear, the postage amount might increment based on the weight of your order.

Our physical address:

Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia

Please checkout our customer service page if you have other frequently asked questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.