Many papers are using gyroscope in their titles but only a few are actually related to the balance of robot, some are reviewed in the paper. To understand the motion of gyroscope, fundamental theory is reviewed and some cases are quoted here as examples. The spinning axis will oscillate because of the rotation of Earth. It is certainly not expected. The device proposed here has its spinning axis perpendicular to the surface of Earth and it is served as a vestibular system in the human ears for humanoid robot. Condensers are used as sensors to detect the deviation from its neutral position. Oscillation circuit will be built and frequency detector will be used. The detected signal will be sent to the computer in the robot to restore it to a proper position.
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