Arduino Robot Projects : Brushed DC Gear Motors, Building BB8 (beginner info)

As background for furthering bb-8 and other hobby robot projects, let's start with a basic discussion of the types of DC gear motors you're likely to choose from. My main motor sources: https://www.servocity.com/motors-actuators/gear-motors http://www.lynxmotion.com/c-71-planetary-motors.aspx http://www.robotshop.com/en/dc-motors.html gearboxes for bigger motors: http://www.banebots.com/category/GEARBOXES.html Need more brushed motor theory? https://en.wikipedia.org/wiki/Brushed_DC_electric_motor#Simple_two-pole_DC_motor