Fundamentals of Piezoelectric Shock and Vibration Sensors
http://www.digikey.com/en/articles/techzone/2011/dec/fundamentals-of-piezoelectric-shock-and-vibration-sensors
簡易的な方法
http://www.robotoid.com/appnotes/sensors-piezo-disc-touch-bar.html
Fundamentals of Piezoelectric Shock and Vibration Sensors
http://www.digikey.com/en/articles/techzone/2011/dec/fundamentals-of-piezoelectric-shock-and-vibration-sensors
簡易的な方法
http://www.robotoid.com/appnotes/sensors-piezo-disc-touch-bar.html