摘要在检测机械零件外形尺寸的细微偏差时，传统方法有着测量功能单一、测量误差较大、无法对测量数据直接进行计算机处理和智能化等缺陷。然而这些参数对产品的使用性能有着重要的影响。为实现这些参数的高效、高精度的测量，针对目前的测量方式存在的这些问题，本课题结合传感器、检测、通讯和微型计算机等技术，采纳模块化、通用化和标准化的设计思想，讨论开发了三色电子柱量仪。本设计首先选定了自感式差动传感器并为其设计了信号采集处理的电路，再确定以高性能单片机 ADμC812 为核心，以使电路设计得到简化、提高稳定性，然后围绕该单片机设计了可随总线速度无限擦写的存取器 FM24C256、容错性能好的 RS-485 串行通讯接口、键盘和 12232F 点阵式液晶显示器等一系列模块，接着采纳 FPGA 器件实现 LED 三色光柱显示驱动，最后对量仪系统软件进行了设计。关键词 ADμC812；菜单结构；LED 光柱显示；FPGA；RS485 串口通讯AbstractWhen measuring subtle differences of the outer sizes of machine parts, the traditional methods have such defects as being singular in measuring function, existing too many errors and having no way to computerize measured data directly. However, these parameters have great influence on products’ attributes. In order to measure these parameters efficiently and accurately, the system used the technology of sensor, automatic acquisition, communication and computer and adopted the design philosophy of modularization, generalization and standardization. We developed this there-color LED bargraph display measuring instrument which can measure the dimension and runout tolerances of mechanical parts.The system of hardware using the fully integrated 12-bit data acquisition system (ADμC812) and FPGA as the LED bar drive circuit to simplify the hardware design and enhance the stability of the hardware. The system of software offers the framework of the function extensibility and the instrument upgrading with the menu operation. At last, we design the s...
