Compass Sensor for Lego Mindstorms NXT

With the compass sensor that is described here the NXT can determine its direction with an accuracy down to a few degrees. This allows a robot to be built that’s capable of navigation.

The company Devantec [2] supplies a ready-to-go compass module type CMPS03. Two mutually perpendicular Philips KMZ51 hall-sensors are used to detect the Earth's geomagnetic field.

http://www.robot-electronics.co.uk/shop/Compass_CMPS032004.htm

http://bricxcc.sourceforge.net/