The compass module is a joint project between Liquidware and Modern Device and is available here as an assembled unit. Thanks! -Justin

This is a fully integrated compass module that combines the Honeywell HMC6352 2-axis magneto-resistive sensors with the required analog and digital support circuits, microprocessor and algorithms for heading computation.

It comes assembled with a 4-pin male header soldered on.

The Compass Sensor is fully integrated with the Antipasto Arduino IDE and can provide compass headings in degrees over Arduino serial.

Applications

• Homebrew virtual reality & gaming systems
• Robotics and dead reckoning navigation systems
• Compassing & outdoor sports
• GPS confirmation
• Antenna positioning

Specifications

• HMC6352 chip
• 4-pin male header included
• 4-pin stack through header included
• Heading output (0-360 degrees)
• I2C 2-Wire Serial Interface
• 3 output modes: Standby, Query, and Continuous
• Heading accuracy: 2.5 degrees
• Heading resolution: 0.5 degrees
• Arduino pin compatible
• +5V Tolerant I/O

Arduino Pin Mapping

Analog 2 = Ground Analog 3 = Vin Analog 4 = Data Analog 5 = Clock

Resources

• LibCompass Arduino Library (also included in the Antipasto Arduino IDE)
• Honeywell HMC6352 Chip Datasheet 
• Compass Module Demo @ Antipasto Blog

Media

Link to the cheatsheet as a PDF...

Souce Code

#include <Wire.h>
#include <LibCompass.h>
LibCompass compass =
LibCompass(0);
void setup() {
Serial.begin(9600);
}
int c;
void loop() {
c = (int)compass.GetHeading();
Serial.print("Heading: ");
delay(5);
Serial.print(c);
delay(5);
Serial.println(" degrees");
delay(5);
}