XV Manlin1, LI Licheng1, ZHENG Tao1, GAO Tianlu1, DUAN Kaiyu2

(1. City College of Science and Technology, Chongqing University, Chongqing 402167, China;

2. Northern New District Suboffice, Chongqing Municipal Public Security Bureau, Chongqing 401121, China)

 

Abstract: Aiming at the problem that traditional blackboard has single surface and isnt wiped, a triprism blackboard with the function of flip and handwriting clear was proposed. The design was based on STC 89C52 MCU, the software was written in C language. Double closedloop DC motor control system was applied to control speed of DC motor in order to stabilize the speed turnover of triprism blackboard, photoelectric encoder was applied to implement localization that the revolves 120 degrees of triprism blackboard. The cleaning of the writing of the triprism blackboard was realized by transmission mechanism of ballscrew. The results indicate that the control precision is improved by the speed regulation system and positioning system.

Key words: equilateral triprism blackboard; double closedloop DC motor control system; photoelectric encoder; STC89C52MCU