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 Micro with Headers [A000053] - ATmega32U4 Microcontroller, 16MHz, 20 Digital I/O Pins, 7 PWM Outputs, USB HID Support, Compact Design for Embedded Projects, Compatible with Arduino IDE

Product ID: 56263945

Details

Brand
Arduino
CPU model
Core i3
CPU speed
16 MHz
Memory storage capacity
32 KB
Model name
A000053

⚡16MHz high-speed clock

📏Compact 1.8" x 0.7" footprint

🔌Native USB HID support

16.42 OMR

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Description

🚀 Tiny board, massive potential — build smarter, faster, cooler!

PLUG PLAY USB HID - Seamlessly acts as keyboard, mouse, or custom USB device
POWERFUL A TMEGA 32 U 4 CORE - 32KB flash & 2.5KB SRAM for advanced embedded projects
PRE SOLDERED HEADERS INCLUDED - Instant integration with sensors & modules, no soldering hassle
FULL ARDUINO IDE COMPATIBILITY - Program effortlessly with extensive libraries & community support
BREADBOARD READY COMPACT DESIGN - Fits perfectly in tight spaces with 20 digital I/O pins

The Arduino Micro with Headers is a compact, breadboard-friendly microcontroller board powered by the ATmega32U4 running at 16MHz. It features 32KB flash memory, 2.5KB SRAM, and native USB HID support, enabling it to function as a keyboard, mouse, or custom USB device. Pre-soldered headers simplify integration with external components, while full compatibility with the Arduino IDE and extensive libraries makes it ideal for professional-grade embedded projects in tight spaces.

Specifications

ASIN	B00AFY2S56
Best Sellers Rank	31,459 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 121 in Microcontrollers
Box Contents	Microprocessor
Brand Name	Arduino
CPU Model	Core i3
Compatible Devices	Keyboard, Mouse, Personal Computer
Country of Origin	Italy
Customer Reviews	4.7 4.7 out of 5 stars (603)
Global Trade Identification Number	07640152111136
Item Dimensions L x W x H	10.2L x 2.5W x 7.6H centimetres
Item Weight	9 Grams
Manufacturer	Arduino
Manufacturer Part Number	A000059
Memory Storage Capacity	32 KB
Model Name	A000053
Model Number	ARD-A000059
Network Connectivity Technology	USB
Number of Items	1
Number of Packs	1
Operating System	Linux
Processor Brand	Microchip Technology
Processor Count	1
Processor Speed	16 MHz
RAM Memory Technology	SRAM
Total USB Ports	1
UPC	758399181809
Unit Count	1.0 count
Wireless Compability	Bluetooth

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