Small Brush-Bot
This is a Brush-Bot platform designed to work with the following hardware.
2 x 2032 Coin Cell Battery Holder - 6V output with On/Off switch
http://www.adafruit.com/products/783
Vibrating Mini Motor Disc
http://www.adafruit.com/products/1201
Adafruit Trinket - Mini Microcontroller - 5V Logic
http://www.adafruit.com/products/1501
Plus whatever sensors you choose.