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Article: PSoC microcontroller and LVDT measure position.
- Article from:
- EDN
- Article date:
- October 26, 2006
CopyrightCOPYRIGHT 2006 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Sigurd Peterson, Sig3 Consulting, Aloha, OR
Edited by Brad Thompson and Fran Granville
Connecting an LVDT (linear-variable-differential transformer) to a microcontroller can prove challenging because an LVDT requires ac-input excitation and measurement of ac outputs to determine its movable core's position (Reference 1 ). Most microcontrollers lack dedicated ac-signal-generation and -processing capabilities and thus require external circuitry to generate harmonic-free, amplitude- and frequency-stable sine-wave signals. Conversion of an LVDT's output signals' amplitude and phase into a form compatible with a microcontroller's internal ADC usually ...