Adafruit GEMMA Mini Wearable v2
Product Details

Adafruit GEMMA Wearable Platform v2

GEMMA is a tiny wearable platform built on a round 1.1 inch (2.8 cm) diameter board. The microcontroller at the heart of GEMMA is the Atmel Attiny85 8-bit MCU and is programmable with an Arduino IDE over USB.

This, the second generation of GEMMA, is physically and code-wise identical to the original but now has a Micro-B USB connector and an On-Off switch. It was designed mainly for wearable applications but its small size and low cost makes it great for a wide range of portable projects.

The Attiny85 processor has 8K of flash and 5 I/O pins, including analogue inputs and PWM outputs. There is a USB bootloader available from but although you can program GEMMA using the Arduino IDE, it is not fully 100% Arduino compatible.

- Super small, only 1.1" / 28 mm diameter and 0.28" / 7mm thick.
- Easy-to-sew or solder pads for embedding in your wearable project
- ATtiny85 on-board, 8K of flash with around 5.25K bytes available for use (2.75K taken for the bootloader)
- 512 bytes of SRAM, 512 bytes of EEPROM
- Internal oscillator runs at 8 MHz
- Ultra low power, draws only 9 mA while running
- Micro-USB jack for power and/or USB uploading
- On-board 3.3 V power regulator with 150 mA output capability and ultra-low dropout. Up to 16 V input, reverse-polarity protection, thermal and current-limit protection.
- 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 I/O pins have 1 analogue input and 2 PWM output as well.
- Hardware I²C capability for breakout & sensor interfacing.

Adafruit GEMMA Wearable Platform

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TechnologyGemma Miniature Wearable Platform Board
Processor Part NumberATtiny85
Processor TypeMCU
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Available to back order for despatch 03/01/2018
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Technical Reference
  • RS Components

    Statement of conformity

    The product detailed below complies with the specifications published by RS Components. Where applicable it provides assurance that electrostatic discharge sensitive devices have been handled and packed under conditions that meet the administrative and technical requirements of the ANSI/ESD S20.20:2014 and BS EN 61340-5-1:2007 Electrostatic Control Standards.
    RS Stock No. 124-5508
    Description Adafruit GEMMA Mini Wearable v2
    Manufacturer/Brand: ADAFRUIT INDUSTRIES
    Mfr. Part No. 1222
    The foregoing information relates to product sold on, or after, the date shown below.
    Date Dec 17, 2017
    RS Components Ltd, Birchington Road, Corby, Northamptonshire, NN17 9RS, UK
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