摘要
红外屏是利用红外线方向性好的特点,对平面坐标进行定位。将多个发射-接收管排布到屏的四周,通过对接收管信号的采集处理,得出触摸点的位置。该系统使用Cortex-M3内核的STM32F103作为主控制器,通过USB HID协议实现标准USB触摸设备,无需用户手动安装驱动,即可实现触摸屏输入。触摸笔只要直径>5 mm,并且能够遮挡红外线即可,例如手指、毛笔等。写字、缩放、旋转等操作都可以通过触摸完成。设计的触屏安装简单,只需USB接口直接与PC相连即可,抗干扰能力强。
The infrared screen performs plane coordinates positioning using the good infrared directional charac-teristics. It obtains the location of touch point by arranging several transmitter-receiver tubes around the screen andby collecting and processing the signals from the receiver tube. The system uses the STM32F103 Cortex-M3 core asthe main controller to realize standard USB touch device via protocol of USB HID （ Human Interface Device） , with-out the need for manual installation of 1 the driver for touch screen input, as long as the diameter of touch pen is over5 mm so as to block the infrared （ such as a finger, brush, etc. ） Operations like writing, scaling, and rotating canbe completed by touch. Installation is simple by connecting the USB interface directly to a PC with good anti-interfer-ence ability.
出处
《电子科技》
2015年第3期142-147,共6页
Electronic Science and Technology
