SW-420 NC Type Vibration Sensor Module for Arduino from BangGood
Spring SALE Discount: http://goo.gl/ImlJc2
Sensor Link: http://goo.gl/uR8A6K
Arduino Sketch: http://pastie.org/9860396 (thanks to +Sir Spf)
This module sends signal when vibration is detected. The sensitivity of it can be adjusted. This video shows connecting the vibration sensor and detecting vibration.