• Super small, only 1.1"" / 28mm diameter & 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•ATtiny 85 on-board, 8K of flash, 512 byte of SRAM, 512 bytes of EEPROM• Internal oscillator runs at 8 M Hz• Ultra low power, draws only 9 m A while running•USB bootloader with a nice LED indicator looks just like a USBtiny ISP so you can program it with the Arduino IDE• Mini-USB jack for power and/or USB (Universal Serial Bus) uploading, you can put it in a box or tape it up & use any USB (Universal Serial Bus) cable for when you want to reprogram• We really worked hard on the bootloader process to make it rugged & foolproof•~5.25K bytes available for use (2.75K taken for the bootloader)• Power with either USB (Universal Serial Bus) or external output (such as a battery)
- it'll automatically switch over• On-board green power LED & 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 & 2 PWM output as well.• Hardware I2C capability for breakout & sensor interfacing.GEMMA is a tiny wearable platform board with a lot of might in a 1"" diameter package. Powered by a Attiny 85 & programmable with an Arduino IDE over USB (Universal Serial Bus), you'll be able to realize any wearable project! The Attiny 85 is a fun processor because despite being so small, it has 8K of flash, & 5 I/O pins, including analog inputs & PWM 'analog' outputs. Adafruit have designed a USB (Universal Serial Bus) bootloader so you can plug it into any computer & reprogram it over a USB (Universal Serial Bus) port just like an Arduino (it uses 2 of the 5 I/O pins, leaving you with 3). In fact they even made some simple modifications to the Arduino IDE so that it works like a mini-Flora. 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 & 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 (Universal Serial Bus) v 3 ports don't recognize the GEMMAs bootloader. Simply use a USB (Universal Serial Bus) v 2 port or a USB (Universal Serial Bus) hub in between• We do not have full Windows 8 driver compatibility tested. At this time we only have it working with Mac, Linux or Windows 7/XPFor more information about GEMMA, check out Adafruits Learning guide please click here