基于MSP430的手写绘图板系统设计实现

Design of Handwriting Board System Based on MSP430

系统以单片机MSP430为核心,采用直流分压并切换直流供电方式来采集覆铜板上表笔接触时的电压,将该电压放大滤波后通过AD采样输入单片机,从而将电压值查表定出相应坐标位置,完成判断表笔是否接触覆铜板,表笔接触象限范围,并在LCD显示屏上显示坐标以及画圆等功能,整个系统在较低功耗下完成。

Based on the MSP430 microcontroller,the system uses the DC voltage and switches DC power supply to sample the voltage signal of the CCL by the pen. After signal filtering and amplifying,the voltage is inputted to microcontroller through AD sampling,and the system calculates the corresponding coordinate of voltage value by table- look- up,determines whether the pen contact CCL,and quadrant range the pen contact,the coordinates of contact points and circle drawing are displayed on the LCD screen. The whole system is under low power consumption.