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This paper shows a basic method to detect the surface of the road using a depth sensor and tracking method for keeping a sensing level using a pan-tilt unit on an inverted pendulum mobile robot. In our mobile robot system, the pitch angle of the robot is not always constant because of only two wheels, and the data from the sensors are affected by it. Therefore, it is necessary to obtain precisely their posture such as position and angles. In this study, a basic approach of detection of thedoi:10.5687/sss.2014.389 fatcat:gfvayf22czdbxa67pxsoj6iex4