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本文设计了一套成本低廉,通过书写笔可以轻松、简便地输入信息并显示的装置,以单片机为微控制器,以32×32点阵LED组成显示模块,结合行、列扫描驱动逻辑电路,编写程序控制所有LED点工作在扫描微亮和稳定点亮两种状态,用光敏三极管和比较器组成新型光笔,通过光笔检测笔尖下方LED的扫描微亮光线使控制器进入中断并记录当前扫描点的坐标编号,从而实现信息输入和LED屏显示控制。所设计的LED显示屏无需数据传输通信,以光笔书写方式输入信息,不需要触控器件,能够实现2s内划亮40点满足书写流畅的要求,可广泛应用于需要频繁更改发布内容的广告显示场合。
In this paper, a set of low cost device that can input information and display easily and conveniently by writing pen is presented. The microcontroller is used as a microcontroller and the display module is composed of 32 × 32 dot matrix LED. Combined with the row and column scanning drive logic circuit, Write program control all LED point work in the scanning light and steady light two states, the photosensitive transistor and comparator to form a new type of light pen, through the light pen detection LED tip under the micro-light scanning to interrupt the controller and record the current scan point Coordinate number, in order to achieve the information input and LED screen display control. The design of the LED display without data transmission communications, written with light pen to enter information, no touch devices, can be achieved within 2s bright 40 points to meet the requirements of smooth writing can be widely used in the need to frequently change the release of the advertising display occasion.