December 2003
Intermediate to advanced
320 pages
9h 28m
English
Content preview from Analog Interfacing to Embedded Microprocessor Systems, 2nd Edition
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Magnetic Sensors
Hall Effect Sensors
Probably the simplest magnetic sensor to use in an embedded application is a Hall
effect sensor. Dr. Edwin Hall discovered the Hall effect in 1879. He discovered
that if a magnetic field was placed perpendicular to one face of a thin gold sheet in
which a current was flowing, a voltage would appear across the sheet (Figure
3.24). This voltage is proportional to the current flowing in the sheet and the
magnetic flux density. A Hall effect sensor is made from silicon, and the Hall
voltage produced in silicon is only a few microvolts per volt per gauss. Conse-
quently, a high-gain amplifier is required to bring the
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