摘 要：随着工业生产效率和产品质量的不断提高，工业现场中有大量的指标需要监测，如温度、压力、湿度、流量等，这些都要用到数据采集系统。目前，大多数数据采集系统使用固定传感器对某一指标进行检测，通用性不强，当同一指标的采集传感器的量程范围改变后就不能再使用。因此，在信息技术高速发展的今天，如何更方便、更准确、更快速地获取分析对象的数据成为了工程技术人员十分关注的问题。

    本篇论文以8051单片机为核心来实现多路数据采集。该方法通过应用ADC0809，将8路被测电压进行模拟量到数字量的转换，然后由单片机对数据进行处理在LED上显示，同时采用MAX232接口芯片来实现MCU与PC机间的电平匹配，最后由PC机完成数据的接收和显示。93405

毕业论文关键词：数据采集，51单片机，ADC0809，MAX232 

Abstract：With the improvement of the efficiency of industrial production and the quality of products, a large number of indicators in the industrial field need to be monitored with the help of the data acquisition system, such as temperature, pressure, humidity, flow, and etc。 At present, in most of data acquisition systems, fixed sensors are used for detecting a certain index, which cannot be used widely because when the measuring range of the sensors of the same indicator change, the sensors will be useless。 Therefore, nowadays with the rapid development of information technology, engineers have paid great attention on how to have more convenient, more accurate and more efficient access to the data of the object they have been analyzing。来自优O尔P论R文T网WWw.YoueRw.com 加QQ7520`18766

    This paper uses 8051 MCU as the core to achieve multi-channel data acquisition。 By using ADC0809, the data of eight channels of the measured voltage will achieve the analog-to-digital conversion。 Then, the data is processed by the microcontroller which is displayed on the LED display screen。 At the same time, using the interface chip called MAX232  is to achieve the matching level between MCU and PC。 In the end, the PC completes the receive and display of the data。 

Keywords: data acquisition, AT89C51, ADC0809, MAX232 

目 录

1  绪论 4

1。1  课题背景及意义 4

1。2  数据采集的发展和现状 4

1。3  设计任务及要求 5

2  系统设计方案及原理 5

2。1  系统总体设计方案 5

2。2  元器件选型 6

3  硬件电路设计 10

3。1  AT89S51单片机最小系统 10

3。2  ADC0809模数转换模块 10

3。3  串行通信模块 11

3。4  LED显示模块 12

4  软件设计 13

4。1  总体流程图 13

4。2  ADC0809采集模块 14

4。3  串行发送程序 15

5  仿真结果 15

结论 18

参考文献 19

致谢 20

附录 21

1  绪论