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RC-Servo motor
  Some hobbyists realize RC-Servo motor, which of cause used for RC-Car or RC-Airplane have positioning function by itself.  Addition to that, it is absolute positioning (not a relative so not require calibration for start up). No feedback required, motor include it with in. motor is relatively compact, small enough for hobby project, gear reduction is also included, and large static friction hold the angle even power is turned off. 
 I thought this is a perfect motor to use for my hobby robot.

 It requires 1-2ms PWM signal to control RC-Servo angle.  Just like this.

 My idea start from this motor - I thought it is possible to make handling robot by this motor so I tried.

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