GEMMA V2- Miniature Wearable Electronic Platform (ID: 1222) Adafruit

DESCRIPTION

GEMMA V2 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 realize any wearable project!

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. We designed a USB bootloader so you can plug it into any computer and reprogram it over a USB port just like an Arduino (it uses 2 of the 5 I/O pins, leaving you with 3). In fact, they have even made some simple modifications to the Arduino IDE so that it works like a mini-Flora. Perfect for small & simple projects the GEMMA will be your go-to wearable electronics platform.

Even though you can program GEMMA V2 using the Arduino IDE, it’s not fully 100% Arduino-compatible. There are some things you trade off for such a small and low-cost microcontroller!

• GEMMA V2 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 v3 ports don’t recognize the GEMMAs bootloader. Simply use a USB v2 port or a USB 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/XP

FEATURES

• Super small, only 1.1″ / 28mm diameter and 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
• ATtiny85 on-board, 8K of flash, 512 bytes of SRAM, 512 bytes of EEPROM
• The internal oscillator runs at 8MHz
• Ultra low power, draws only 9 mA while running
• USB bootloader with a nice LED indicator looks just like a USBtinyISP so you can program it with the Arduino IDE (with a few simple config modifications)
• Mini-USB jack for power and/or USB uploading, you can put it in a box or tape it up and use any USB cable for when you want to reprogram.
• ~5.25K bytes available for use (2.75K taken for the bootloader)
• On-board 3.3V or 5.0V power regulator with 150mA output capability and ultra-low dropout. Up to 16V input, reverse-polarity protection, thermal and current-limit protection.
• Power with either USB or external output (such as a battery) – it’ll automatically switch over
• 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 IO pins have 1 analogue input and 2 PWM output as well.
• Hardware I2C capability for breakout & sensor interfacing.

RESOURCES

• Introducing Gemma
• GEMMA Hoop Earrings
• Trinket / Gemma Space Invader Pendant
• Superhero Power Plant
• Trinket / Gemma Blinky Eyes