Abstract: A robot control system includes a signal transmission device and a robot. The signal transmission device has two signal transmission elements that substantially transmit a first signal along a first direction and a second signal along a second direction respectively. The first signal defines a first signal area, and the second signal defines a second signal area. The overlap portion of the first and second signals defines a confinement area. The robot includes a detecting module and a control module. The detecting module detects the confinement area by detecting the first signal and the second signal simultaneously. When the detecting module detects the confinement area, the control module controls the robot to change direction and then move for a distance. Besides, a robot control method applied to the robot control system is also disclosed.

Abstract: The invention discloses a pointing device comprising a first sensing unit, a second sensing unit and a processing unit. The first sensing unit is utilized for sensing a first rotational angle of the pointing device relative to an absolute coordinate system. The second sensing unit is utilized for sensing a second rotational angle of the pointing device relative to the absolute coordinate system. The processing unit is utilized for receiving the first and second rotational angles, calculating an absolute difference between the first and second rotational angles and judging whether the absolute difference is smaller than a predetermined threshold. If it is YES, the processing unit outputs the first rotational angle; otherwise, the processing unit calibrates the first rotational angle by the second rotational angle and then outputs the calibrated rotational angle.