手写绘画板 作者：杜隆生、吴可、谢刚 1 摘要： 本作品是基于覆铜板设计制作的手写绘图输入设备，设备用一根普通表笔连 接到电路，表笔与铜板表面接触，检测表笔与铜箔的接触，并测量触点位置。基 本原理是恒流源通过表笔输出到铜板，铜板四角连电阻接恒流源反馈端形成电桥。 放大对角线差分信号，使用单片机做 AD采集，进行曲线拟合得到坐标并显示， 实现定位、绘图、写字的功能。 关键词： 覆铜板，手写绘图，差分放大，曲线拟合 Abstract： Design of this device is based on copper-clad plate. In application, connect the multimeter test lead of the device to the circuit, then detect the contact between the test lead and the copper foil, thus measure and determine the accurate contact position. The technical rationale behind the design is that four corners of the copper-cladplateconnectedtofourresistorstogetherwiththereference port of constant current source form an electrical bridge. By applying curve fitting to the data processed by MCU and displaying them in the coordinate, the device supports positioning, drawing and writing. Keywords： Copper-clad Plate, Drawing, Differential Voltage Amplifier, Curve Fitting 2 1 目录 1设计任务与技术指标.................. 1 1.1设计任务......