摘要
系统以STM32处理器为控制核心,主要包含恒流源模块、输入模块、放大输入检测模块、显示模块等。通过将覆铜板上变化的电压使用精密放大器放大后送给A/D转换电路进行数据采集,单片机对采集的数据进行处理,计算出触点的坐标并在液晶显示屏上进行显示。运行结果表明,该系统可以正确识别手写输入的图形和文字。
The proposed system takes the STM32 processor as its control core,and mainly includes constant current source circuit,input circuit,input detection amplifier circuit and liquid crystal display circuit. The sampling data of the A / D converter circuit is given by the voltage amplifier which is changed by the copper clad laminate,according to the data processed by the A / D converter,the coordinates of the contact points are calculated by scm,and displayed in the liquid crystal. The results show that the system can correctly identify the graphics and text of the handwriting input.
出处
《微型机与应用》
2016年第9期101-102,共2页
Microcomputer & Its Applications
