基于.--单片机的液位控制系统设计的~毕业设计论文

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1、.wd摘 要本课题是基于单片机的液位控制系统的设计，使用在日常生活和工业应用中广泛应用的水塔作为被控装置，水塔液位和水压作为被控对象；本设计采用液位检测装置和电容式差压变送器对液位高度和压力进展实时检测并传送到单片机进展实时处理，从而使水塔水位自动保持在指定的范围。其中，液位控制系统的硬件电路主要包括水位和水压检测电路、A/D转换电路、键盘显示电路、报警电路、电机控制电路等五大局部；该系统使用电容式差压变送器对水塔水压进展检测并将检测到的信号送给A/D转换器，A/D转换器将对应的模拟电压信号转换成数字量传给单片机AT89C51进展处理，单片机将处理的结果通过数码管显示出来，并完成对排水、抽水电

2、动机的控制；在单片机进展实时处理的同时，可以通过按键对控制系统进展相应的功能切换。该系统各个局部的硬件电路采用C51语言编写控制程序，从而实现使用键盘调整被控参数水压的上、下限以及软件复位功能；利用四位一体共阴极数码管显示水压；通过逻辑代码到达对电机控制电路的控制，使电机在一定的条件下进展抽水或者排水操作；最终使被控对象被控制在指定的水位和水压范围内。在将系统的硬件电路设计和软件程序设计完成后，需要将硬件电路局部和软件程序局部结合起来进展液位控制系统的调试，如果发现问题，就需要找到适宜的解决方案，修改错误的局部；并且将这两者结合进展液位控制系统仿真结果的测试，观察实验的结果是否符合课题的设计要

3、求，不然修改不符合课题要求的局部，最终到达液位控制系统的课题目标。关键词：AT89C51单片机；A/D转换；液位控制AbstractThis topic is the design of control system based on single-chip liquid level control, usingthe tower as a controlled device which is often seen in daily life and industrial application, the liquid level of the water tower and water pr

4、essure as the object; this design uses the liquid level detection device and capacitive differential pressure transmitter to monitor the liquid level and pressure and real-time processing, so that the water level automatically keeps in the specified range. The hardware circuit of control system main

5、ly has five parts, which includes water pressure and liquid level detection, A/D converter, keyboard display circuit, alarm circuit, motor control and so on; the system uses capacitive differential pressure transmitter to detect the tower pressure and the detected signal is sendedto the A/D converte

6、r; A/D converter will convert this analog voltage signals into digital signals which send to the AT89C51 single-chip,and the micro-controller processes the results, which can use the nixie tubes todisplay, and accomplish the control of drainage and pumping motor; At the same time of real-time proces

7、sing in the SCM, the corresponding buttoncan switch to different functions of the control system.Each part of the hardware circuit of the system uses C51 language to program, so as to realize the use of the keyboard to adjust the controlled parameters of upper and lower limit pressure; using one of

8、LED to display the pressure, through the logic code to control the control circuit of the motor, the motor will pump or drain under a certain condition; ultimately the water pressure and water pressure will be controlled in a specified range.After the design of hardware circuit and software program,

9、 debugging liquid level control systemcombininghardware with software part is needed; if errors are found, findthe right solution, modify the wrong part; also this combination of liquid level control system simulation results need test, and observe the experimental results whether or not these resul

10、ts are in conformity with the requirements of the project design; Otherwise, modifying the part that does not meet the requirements of the project, and ultimately the aim of liquid level control system will be achieved.Keywords: AT89C51 single chip micro-controller; A/D conversion;liquid level contr

11、ol目 录摘要IAbstractII第1章绪论11.1 课题的意义11.2 国内外的研究动态21.3 课题的目的和预期目标3第2章系统整体方案设计4第3章硬件电路设计63.1 AT89C51单片机63.1.1 单片机的功能和特点63.1.2 时钟和复位电路83.2 水位检测电路和水压检测电路93.2.1 水压检测电路以及控制仪表93.2.2 水位检测电路103.3 A/D转换设计113.3.1 A/D转换器介绍113.3.2 A/D转换电路133.4 数码管显示和键盘电路143.4.1 键盘电路143.4.2 数码管显示电路153.5 报警电路173.6 电机控制18第4章软件设计194.1