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Adafruit GEMMA v2 - Miniature wearable electronic platform
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The Adafruit GEMMA V2 is a tiny, coin-sized wearable microcontroller board powered by an ATtiny85 processor. At just 28 mm in diameter, it's small enough to ...
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The Adafruit GEMMA V2 is a tiny, coin-sized wearable microcontroller board powered by an ATtiny85 processor. At just 28 mm in diameter, it's small enough to fit into any sewable or wearable project, and affordable enough to dedicate to every build. Program it over USB with the Arduino IDE and bring your wearable ideas to life.
Version 2 upgrades the original GEMMA with a Micro-B USB connector (replacing Mini-B) and adds a convenient on/off switch. Three GPIO pins with sew-friendly pads make it easy to connect sensors, LEDs, and other components using conductive thread or alligator clips.
Key Features
- ATtiny85 Processor – 8 MHz internal oscillator, 8 KB Flash, 512 bytes SRAM, 512 bytes EEPROM (~5.25 KB available after bootloader)
- Ultra Compact – Only 28 mm diameter and 7 mm thick
- Micro-USB Connector – For power and programming via Arduino IDE
- On/Off Switch – New in V2 for convenient power control
- 3 GPIO Pins – With 1 analog input, 2 PWM outputs, and hardware I²C support
- Easy-to-Sew Pads – Large holes for conductive thread or alligator clips
- Ultra Low Power – Draws only 9 mA while running
- 3.3V Regulator – 150 mA output, up to 16V input with reverse-polarity, thermal, and current-limit protection
- Flexible Power – Automatically switches between USB and external battery power
- Built-in LEDs – Green power LED and red LED on pin 1
- Reset Button – Enter bootloader or restart your program
Ideal For
- Sewable wearable electronics and e-textile projects
- Small, low-cost embedded builds
- LED jewellery, costumes, and accessories
- Beginner Arduino projects in a compact form factor
Package Contents
- 1× Adafruit GEMMA V2 board – Fully assembled and tested
Note: GEMMA is not fully 100% Arduino-compatible. It does not have a serial port for debugging, and some USB 3.0 ports may not recognise the bootloader — use a USB 2.0 port or hub if needed. USB cable not included.
Tip: Want more power and CircuitPython support? Upgrade to the Adafruit GEMMA M0 — same form factor with a 32-bit processor, 256 KB Flash, and native USB. Or grab a complete starter kit: the Gemma Sensor Starter Pack or the Gemma Sequin Starter Pack.
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- 3.3V regulator
- A 3.3V regulator is a power circuit that provides a steady 3.3 volts for parts that need that supply voltage. On a breakout board, it can let the sensor run safely even when the connected microcontroller or power source uses a higher voltage.
- Bootloader
- Small starter software on a microcontroller that lets new code be uploaded before the main program runs. Knowing how to enter bootloader mode matters when you need to program the board or recover it after a faulty sketch.
- CircuitPython
- A beginner-friendly version of Python designed to run directly on microcontroller boards. If a product supports CircuitPython, you can often program it by copying code files onto the board rather than setting up a more complex toolchain.
- conductive thread
- Thread made with metal or other conductive fibres so it can carry electricity while being sewn into fabric. It matters for wearable and textile projects because it can replace wire, but it has more resistance than normal hookup wire.
- EEPROM
- A type of non-volatile memory that keeps stored data even when power is turned off. In a sensor module, it can be used to store settings or calibration data so they do not need to be re-entered every time.
- GPIO
- General-purpose input/output pins are microcontroller pins you can set in software to read signals, switch devices on and off, or connect to peripherals. The number of GPIO pins matters because it limits how many buttons, LEDs, sensors, and other parts you can wire directly to the board.
- IDE
- Short for Integrated Development Environment, a program used to write, run and manage code. It matters because some learners prefer a traditional coding workspace instead of a guided notebook-style lesson.
- LED
- A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- native USB
- Native USB means the microcontroller itself handles USB communication, rather than using a separate USB-to-serial chip. This matters for programming, debugging, and projects that need the board to act directly as a USB device.
- PWM
- Pulse Width Modulation is a way for a digital pin to simulate variable output power by switching on and off very quickly. It matters for controlling things like LED brightness, motor speed, or servo-style signals from a microcontroller pin.
- SRAM
- Fast temporary memory used by a processor while a program is running. More SRAM helps with projects that handle larger data buffers, networking, displays, or more complex code.
- Thread
- A low-power wireless mesh networking standard designed for smart home and IoT devices. It matters because Thread devices can relay messages through each other, helping build reliable networks for sensors and controllers.
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