基于单片机数字电压表的硬件设计.doc

课程设计(论文)说明书 题 目：基于单片机的数字电压表 院 （系）： 信息与通信学院 专 业： 通信工程 学生姓名： 学 号： 指导教师： 职 称： 2012年12月5日 摘 要 本系统主要采用AT89C52芯片和ADC0809芯片来完成一个数字电压表设计，能够对输入的0～5 V的模拟直流电压进行测量，并通过一个4位一体的8段LED数码管进行轮流显示或单路选择显示，测量误差约为0.02 V。还可以与PC进行串行通信。该电压表的测量电路主要由三个模块组成：A/D转换模块、数据处理模块及显示控制模块。A/D转换主要由芯片ADC0809来完成，它负责把采集到的模拟量转换为相应的数字量再传送到数据处理模块。数据处理则由芯片AT89C52来完成，其负责把ADC0809传送来的数字量经一定的数据处理，产生相应的显示码送到显示模块进行显示；另外它还通过P2端口控制着ADC0809芯片的模拟通道地址、A/D转换控制信号和时钟信号。显示模块主要由8段数码管组成，显示测量到的电压值。 最终，该系统达到设计的目的，高精度的显示了所测量的电压值，并可以通过按键开关准确无误的轮流或单路显示8（IN0～IN7 ）ABSTRACT In the system AT89C52 chip and ADC0809 chip are mainly used to complete the design of a digital voltage meter, The measurement from the digital voltage meter can be carried out at the arrange of the input 0~5V analog DC voltage, and 4 through a one paragraph 8 digital tube LED take turns to display take turns or one-way choose to display, the measurement error is about 0.02 V. The system can also communicate with PC serially. It mainly consists of three modules: A / D converter module, data processing module and the display control module. ADC0809 chip is employed for A / D conversion, and it is responsible for collecting analog signal and converting the analog signal to digital signal and sends digital data-processing module. AT89C52 is the controller and in charge of data processing, the ADC0809 is responsible for transmission to digital by a certain degree of data processing; Analog channel address of ADC0809 chip, A / D conversion control signal and clock signal are all controlled by the P2 port. Display module mainly composes of 8digits, indicating the voltage value that is measured. In final, the design goal is achieved, The voltage measured is displayed accurately. the 8 (IN0 ~ IN7) channels alternative display or one-way choice display can be carried out by button correctly. Key wor