1222 Adafruit Industries Gemma, Wearable Attiny85 Microboard

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 create any wearable project.

• Super small, only 28mm diameter and 7mm thick
• Easy-to-sew or solder pads
• Low cost
• 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
• Mini-USB jack for power and/or USB uploading
• ~5.25K bytes available for use
• On-board 3.3V power regulator with 150mA output
• Power with either USB or external output
• On-board green power LED and red pin LED
• Reset button for entering the bootloader or restarting
• The 3 IO pins have 1 analog input & 2 PWM output
• Hardware I2C capability for breakout & sensor interfacing