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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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