HM55B Datasheet, PDF (3/25 Pages) List of Unclassifed Manufacturers – Compass Module

Quick Start
Calibration
The calibration and test-calibration programs will compensate for the effects of magnetic fields that may
be resident to the module PCB and the carrier board it's mounted on, as well as nearby jumper wires and
batteries. It also corrects for the HM55B chip's axis sensitivity, offset and skew errors, if any. You will
need a magnetic compass to verify magnetic north as a reference. After calibration, the Hitachi HM55B
Compass Module should be able to accurately discern 64 or more angles, referenced to magnetic north.
√ Make a printout of the 16-segment compass shown below.
√ Align the printout to magnetic north with the aid of the magnetic compass.
√ Affix the aligned printout to your work surface.
√ Make sure to set the magnetic compass well away from the printout before continuing.
√ Align the Compass Module to magnetic north by lining up the edge of your carrier board with the
dashed line that passes through the 0° mark.
© Parallax, Inc. • Hitachi HM55B Compass Module (#29123) • 05/2005
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