What's the simplest way to check vibration with Arduino? Use a vibration sensor from DFRobot. You can directly plug it on our IO Expesion Shield V7. Just vibrate this sensor, Arduino can receive a digital signal. It's easy to acount and program in Arduino.
Despite it's simple, you can make full use of it with creative thinking, like step counting, Crash warning light and so on.
a simple Pedometer device that can count your step