基于覆铜板的手写定位设计

Handwriting positioning design based on copper clad plate

设计的核心算法是将坐标点测量距离问题转化为电阻测量问题,进而转化为电压测量问题,通过电压的测量实现坐标的测量。设计以给5cm*5cm的覆铜板四个角串联电阻和加电压源的方法实现大电流的目的,采用由AD620构成的仪表放大器对微弱信号进行放大,以C8051F020单片机为核心进行测量、控制,实现了小电阻覆铜板触点坐标的测量,测量结果由LCD液晶显示器进行显示。

The core algorithm of the design is to transform the problem of coordinate point measurement distance into the problem of resistance measurement, and then into the problem of voltage measurement. Designed to give 5 cm * 5 cm four angles of the copper clad laminates series resistance and can realize the purpose of high current voltage source, the composed of instrumentation amplifier AD620 is adopted to weak signal amplification, C8051F020 MCU as the core for measurement, control, realized the small resistance copper clad contact coordinates measurement, measurement results by LCD LCD display.