The Adafruit Vibrating Mini Motor Disc is simplicity itself to use, apply power and it buzzes, remove power and it stops. They will work from 2 to 5V with stronger vibrations from the higher voltage and the drive circuit can be as simple as a battery and switch. If you want to drive it from a microcontroller such as an Arduino then you will need a series resistor to limit the current draw. Please see the technical specification for details of the current draw at various input voltages. If you want to take the load off the microcontroller then pop in a 2N2222 transistor to handle the current.
