 Hobby servo motors come in a variety of sizes and they're easily identifiable by their three-pin connectors Red or orange for power brown or black for ground and white or yellow for signal wire Servos make it easy to add motion to a project without the need for complex motor drivers They can rotate about a hundred and eighty degrees all the way left is considered zero degrees Middle is 90 and all the way right is 180 degrees This one's powered by five volts DC, but it can get by with as little as four volts or as much as six The servo's signal can be driven by short pulses from a microcontroller pin sent 50 or 60 times a second The width of the pulse determines the position the servo will rotate to one millisecond is zero degrees 1.5 milliseconds 90 degrees Two milliseconds is 180 degrees You