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Product Overview

The 1222 is an Adafruit GEMMA v2 Miniature wearable electronic platform board. This compact design consists of Arduino compatible microcontroller suitable for wearable projects. The Attiny85 is a fun processor because despite being so small, it has 8K of flash and 5 I/O pins including analogue inputs and PWM analogue outputs. The board is designed with a USB bootloader so that user can plug it into any computer and reprogram it through USB port. GEMMA board is programmed with Arduino IDE but it is not 100% Arduino compatible. This board do not have serial port connection for debugging, hence the serial port monitor will not be able to send/receive data. Some computers with USB v3 ports don't recognize the GEMMA's bootloader, simply use USB v2 port or a USB hub in between. GEMMA board is powered upto 16V and featured with internal 3.3V low dropout regulator with 150mA to provide best output capability.
  • Super small 1.1"/28mm diameter and 0.28"/7mm thick
  • ATtiny85 onboard, 8K of flash, 512 bytes of SRAM, 512 bytes of EEPROM
  • 8MHz internal oscillator
  • Ultra low power and draws only 9mA while running
  • USB bootloader with a LED indicator
  • Powered with mini USB jack
  • Power with either USB or external output
  • Reset button for entering to bootloader or restarting the program
  • Three GPIO pins have 1 analogue input and 2 PWM outputs
  • Hardware I2C capability for breakout & sensor interfacing


Embedded Design & Development; Hobby & Education
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Product Specifications, Documents & More

  • Core Architecture: AVR
  • Core Sub-Architecture: tinyAVR
  • Features: Bite-sized Version, Attiny85 & Programmable with an Arduino IDE Over USB, On-board LEDs
  • Kit Contents: Dev Board ATtiny85 MCU
  • No. of Bits: 8bit
  • SVHC: To Be Advised
  • Silicon Core Number: -
  • Silicon Family Name: ATtiny
  • Silicon Manufacturer: Atmel

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  • 76 in stock for same day shipping
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    More stock available week commencing 12/21/15

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Price: $7.95 $7.95



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