基于单片机的TDS水质测试仪设计职业学院电子信息工程毕业论文.doc

学号 苏州市职业大学 毕业设计 题目 基于单片机的 ___ TDS水质测试仪设计 学生姓名： 专业： 学院 (部)：指导教师：指导教师：日期： 摘要 本设计通过研究分析TDS（溶解性总固体）测量的原理，设计了一款以AT89S51单片机为核心的水质测试仪。本设计通过电导率测量电路实现电导率信号的采集，并采用温度传感器进行温度测量，使用温度补偿方法减小温度对电导率测量值的影响，通过单片机程序进行相关计算得出TDS值。设计包括信号采集电路、按键电路、测温电路、液晶显示电路。选用AT89S51作为该水质测试仪是由于其结构简单，操作容易，低成本。测量的TDS值对帮助人们了解水质情况起到了非常重要的作用。了解检测的水中各种参数，通过这些了解到水质的基本信息，并作出相应的调整计划。水质合格了，这样我们的生活才会有保障。 关键词：水质检测 AT89S51 程序编写 Abstract This design through the study and analysis of the principle of TDS (total dissolved solids) measurement, the design of a AT89S51 microcontroller as the core of the water testing instrument. This design by conductivity measurement circuit to achieve conductivity signal acquisition, and the temperature sensor for temperature measurement and temperature compensation method to reduce the temperature influence on the conductivity measurements, through the SCM program for correlation calculation to obtain the value of TDS. The design includes signal acquisition circuit, key circuit, temperature measurement circuit, liquid crystal display circuit. AT89S51 as the water quality testing instrument is because of its simple structure, easy operation, low cost. Measurement of the TDS value to help people understand the situation of water quality has played a very important role. Understanding of the detection of various parameters in the water, through these basic information to understand the water quality, and make the appropriate adjustments. The water quality is qualified, so our life will be guaranteed. Key word: Water quality testing, AT89S51, Program writing  目 录 摘 要………………………………………………………………Ⅰ Abstract………………………………………………………………Ⅱ 1 绪论…………………………………………………………………1 1.1 影响水质因素………………………………………………………………1 1.2 水质检测的意义……………………………………………………………2 2 系统的设计内容及方案……………………………………………3 2.1 设计内容……………………………………………………………………3 2.2 设计方案……………………………………………………………………3 3 硬件电路设计 ……………………………………………………4 3.1 元件选择 ……………………………………………………………………4 3.1.1 A