Fig:Servo Motor: DC motors ,built in gearing and feedback control loop circuitry
Each motor assembly comes complete with a gear box and control electronics that make interfacing them to microcontrollers. With the wide variety of available end attachments, it is easy to mount wheels and custom mechanisms to the motor .You can see the control circuitry, the motor, a set of gears, and the case. You can also see the 3 wires that connect to the outside world. One is for power (+5volts), ground, and the white wire is the control wire. The spline is the output shaft of the servo. This is where you would attach your servo horn or servo arm
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