How to Test Amplitude-Phase Response of Sensors and Circuits using Arduino DUE?

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MagicianT
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Arduino DUE based project for testing amplitude-phase response of the sensor or circuitry.
Resonance frequency detection based on zero phase crossing, range up to 250 kHz.

Check it out : https://coolarduino.wordpress.com/2014/12/24/lcq-meter-amplitude-phase-characterizer-piezo-tester/

https://coolarduino.files.wordpress.com/2014/12/twopeaks.jpeg
 
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Looks like a fun project. I skimmed some of the material at your link. Can you describe in a couple paragraphs here what your overall design goals were, and what challenges you encountered?