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When drawing Angles, we need a ruler, set square and protractor.However these things repeatedly brought inconvenience to use. Now we design a ruler, which can solve all the problems in the drawing. It consists of electronic compass, battery, solar panel, display screen and a light emitting diode. When painting Angle, light according to display, record a ruler initial position, turn the ruler, electronic compass measuring ruler rotation Angle, the display can be displayed. Draw a straight line or when measuring length, built-in light diode can form light on the ruler and paper. It gives the users more accurate feeling.
China University of Mining and Technology
China University of Mining and Technology Yan3#，China Unversity of Mine and Tchnology，Xuzhou Jiangsu，PRC 221116 xuzhou, China