用于超级黑板的可抗震型光电定位系统设计

Design of the Anti-Vibrate Photoelectric Positioning System for Super Blackboard

针对"超级黑板"应用中的定位要求,开发了一种可抗震型光电定位系统。采用STM32F103单片机作为主控芯片,选用光敏电阻检测光线,设计了矩阵键盘式电路以节约I/O口资源、缩短定位时间;芯片与电路的配合使系统具备了实时输出数字位置信号的能力。通过卡槽结构和激光头的安装,使该系统适用于以下工况:首先,测量范围较大,且要求在测量范围内无盲区(整个被测范围内保持一定的精度);其次,测量空间狭小且存在一定的震动。样机的实测结果显示,当测量范围为2 m时,系统测得的位置误差小于±0.5 cm,即精度可达0.25%。

In view of the positioning requirement in application of＂Super Blackboard＂,an anti-vibrate photoelectric positioning system has been developed. Making use of microcontroller STM32F103 as the main control chip; and selecting photosensitive resistance to detect the light; the matrix keyboard circuit is designed to save the resources of I/O ports,and shorten the time of positioning; meanwhile; the cooperation of the chips and the circuits makes the system possess the ability of outputting the digital information of position in real time. With the structure of slots and the installation of the laser head,the system is suitable for following working environments： these are large range of measurement and no blind area exists in the range of measurement（ keeping a certain precision in the whole range being measured）,and the space of measurement is narrow and a certain vibration exists. The test results of the prototype show that in the case of 2 m measurement range,the system keeps the output error of the position within ± 0. 5 cm,i. e.,the precision is up to 0. 25%.