HM55B Datasheet, PDF (1/25 Pages) List of Unclassifed Manufacturers – Compass Module

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Hitachi^® HM55B Compass Module (#29123)
General Description
The Hitachi HM55B Compass Module is a dual-axis magnetic field sensor that can add a sense of direction
to your next electronic or robotic project. The sensing device on the Compass Module is a Hitachi HM55B
chip. An onboard regulator and resistor protection make the 3 volt HM55B chip compatible with 5 volt
BASIC Stamp^® microcontroller supply and signal levels. The Compass Module also makes all the power
and signal connections on the tiny surface mount HM55B chip accessible in a breadboard-friendly 0.3 inch
wide 6-pin DIP package. Acquiring measurements from the module is made easy with the BASIC Stamp
2 microcontroller's SHIFTIN and SHIFTOUT commands, which are designed for synchronous serial
communication with chips like the HM55B.
Features
• Sensitive to microtesla (µT) variations in magnetic field strength
• Simplifies direction by resolving magnetic field measurements into two component axes
• Good for 6-bit (64-direction) resolution measurements after software calibration
• Only 30 to 40 ms between start measurement and data-ready
• Built-in resistor protection for data pins eliminates bus conflict risks
• Compact and breadboard-friendly 0.3 inch, 6-pin DIP package
• Compatible with all BASIC Stamp, Javelin Stamp and SX microcontrollers
• Makes communication and direction calculations especially easy with the PBASIC commands
SHIFTOUT, SHIFTIN, and ATN for the BASIC Stamp 2 series of microcontrollers
Application Ideas
• Mobile robot direction sensor
• Handheld electronic compass
• Weathervane indicator for remote weather stations
• Audible compass for the vision impaired
• Automotive electronic compass
Quick Start Circuit
29123
© Parallax, Inc. • Hitachi HM55B Compass Module (#29123) • 05/2005
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