I'd like to dd a GPS module to this, which is the smallest and best option I hve?

Look into Adafruit GPS modules compatible with the arduino. I know they have shield GPS modules for the uno so you can probably find an unshielded version to use on the micro. Basically go to adafruit.com and take a look. They also helped design the micro so best chance for compatibility.

What are the dimensions (and weight) of the board? Amazon only seems to list the packaging dimensions.

From the Arduino web sitec http://arduino.cc/en/Main/ArduinoBoardMicro "The maximum length and width of the Micro PCB are 4.8cm and 1.77cm respectively, with the USB connector extending beyond the former dimension." Height about 20mm (defined by header pins) Weight 7 g. Also check out the Nano board.

does it have the I2C bus ?

Hi, yes! Here is a tutorial with more info: http://tronixstuff.com/2010/10/20/tutorial-arduino-and-the-i2c-bus/

is this as powerful as the Arduino mega?

Simply, no. But powerful for its small size.

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Arduino A000059 Micro Board | Original Arduini Micro

Arduino A000059 Micro Board | Original Arduini Micro

Product ID: 96344263

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Details

Brand
Arduino
Compatible Devices
Keyboard Mouse
Memory Clock Speed
16 MHz
Memory Storage Capacity
32 KB
Manufacturer
Arduino St.

💾32 KB memory storage

🔌20 digital I/O pins

⏱️16 MHz crystal oscillator

Description

🚀 Micro size, mega potential — build your future today!

PLUG PLAY USB - Micro USB connection for instant PC integration and coding.
COMPACT POWERHOUSE - Fits perfectly on breadboards for seamless prototyping.
RELIABLE PERFORMANCE - Powered by the robust ATmega32U4 microcontroller at 16 MHz.
DESIGNED BY INNOVATORS - Official Arduino board developed with Adafruit expertise.
VERSATILE CONNECTIVITY - 20 digital I/O pins to control a wide range of devices.

The Arduino A000059 Micro Board is a compact, professional-grade development board featuring 20 digital input/output pins, a 16 MHz Atmel ATmega32U4 microcontroller, and 32 KB of memory. Designed for seamless USB connectivity and breadboard compatibility, it empowers makers and managers alike to prototype and innovate with ease.

Specifications

Brand	Arduino
Manufacturer	Arduino
Country of Origin	Italy
Model number	A000053
Colour	Multi
Form Factor	Micro ATX
Number of Memory Sticks	1
Special Feature	USB
Item Weight	9 g
Product Dimensions	10 x 5 x 8 cm; 9 g
Item model number	A000053
Item Height	8 Centimeters
Item Width	5 Centimeters
Auto Focus Included	No
Processor brand	Atmel
Processor Speed	16 MHz
Memory Storage Capacity	32 KB
Memory clock speed	16 MHz
Hard Disk Interface	USB
Wireless Standard	Bluetooth
Connectivity Technology	USB
Compatible Device	Keyboard, Mouse, Personal Computer
Included Components	Arduino Micro
Are batteries included?	No
Hardware Interface Type	USB

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