1、数字电容测量仪 I 摘要 当前现代化电子市场正朝着快速及便利同时大容量的方向发展， 现代电子产 品几乎能运用到社会的各个领域当中，有力的推动了社会现代化的发展。同时， 电子产品也被要求以更快速度的升级和更快速的处理。 本设计以 STC89C52 单片机和 555 振荡器作为主要元件， 来实现对电容容量 的基本测量。本设计基于 555 振荡器构成多谐振荡器来产生输入脉冲信号，然后 再通过 STC89C52 单片机对方波脉冲进行中断计数而测量电容的。 在多谐振荡器 输出端加入一个 74HC08 使输出波型毛刺减少，从而使单片机测量结果变精确。 555 振荡器所产生的信号会根据所选的电阻的阻值不同，
2、从而调节电容的参数 值，这样就可以确定被测电容的容值范围，最后通过 LCD1602 显示器显示被测 电容容值。在软件设计中，该设计使用 C 语言来编写程序。该仪器具有方便快 捷，简单实用，价格低廉等特点。 关键词：电容测量;555 振荡器;STC89C52;LCD1602 数字电容测量仪 II Abstract The current modern electronic market is headed in fast and convenient large capacity and the direction of development, modern electronic produc
3、ts to use to almost all areas of society of powerful promoted the development of modern society. At the same time, the electronic products also are required to faster speed upgrade and more fast process. This design to STC89C52 single-chip microcomputer and 555 oscillator as the main components, to
4、realize the basic capacity of capacitance measurement. This design based on the 555 oscillator to generate more than a harmonic oscillator input pulse signal, and then through the STC89C52 microcontroller each other to interrupt pulse count and measurement of capacitance. In order to join the output oscillator a 74 HC08 to make the output waveform burr reduced, so that the single chip microcomputer variable precision measurement results. 555 oscillator generated signal will be selected according
