毕 业 设 计Graduation Design（题 目数字电压表 的设计 摘 要在电子应用领域，工业自动化仪表已经有了非常广泛的应用。本文设计的数字电压表以 AT89C51 单片机为主要控制器件，利用 ADC0808 把模拟信号转换为数字信号并加以显示的电路。它的设计主要包括硬件电路和系统程序两部分设计。硬件电路主要是单片机最小设计模块、A/D 转换模块和显示模块的设计，系统程序设计则是通过 AT89C51 单片机先将系统初始化，通过 ADC0808 转换芯片把模拟量转换成数字量，最后通过数码管显示数据。设计的数字电压表的测量围为 200mv—10v，对直流电压进行测量。该电路功能强大，有报警系统，可控制测量围，数码管显示精度高，可扩展性强等优点。数字电压表的应用在很多领域，有非常好的应用前景。对数字电压表进行讨论很有必要性。这对我们讨论单片机技术是很有帮助的。关键词：AT89C51；ADC0808；电压测量；A/D 转换AbstractIn electronic applications, industrial automation instruments have a very wide range of applications. This design of a digital voltmeter to AT89C51 microcontroller as the main control device, use it ADC0808 analog signals into digital signals and display them circuit. Its design includes hardware and system design program in two parts. The hardware circuit design module is the smallest single-chip design A / D converter module and display module, system programming is through the first AT89C51 SCM system initialization, by ADC0808 converter chip to convert analog to digital, and finally through a digital display data. Measuring range designed digital voltmeter is 200mv-10v, DC voltage measurement. The circuit is powerful, alarm system, control measuring range, digital display and high precision, scalability and other advantages.Application of digital voltmeter in many areas, there is a very good prospect. Conduct research on the digital voltmeter very necessity. This single-chip technology for our study is helpful.Key words: T89C52; ADC0808; Voltage measu...
