基于STM32PH自动控制加液机设计.doc

毕业设计(论文) 学生姓名： 学 号： 所在学院： 自动化与电气工程学院 专 业： 自动化 设计(论文)题目：基于STM32的pH自动控制加液机的设计 指导教师： 基于STM32的pH自动控制加液机的设计 摘要 pH值的控制过程广泛存在于石油、化工、造纸、制药、废水处理及给水处理中，在工业生产过程中必须将pH值严格控制在某特定范围之内，否则将会造成产品质量的下降，原料的浪费，导致生产不能运行，经济效益下降，环境污染。因此pH值的控制有着非常重要的意义。 本文的核心在于基于ARM的pH值自动控制系统，该系统的pH采样部分采用高精度的pH传感器将pH值转化为电压值，采用高性能的A/D转换模块将采集到的电压值转化为数字量，该数字量一部分通过显示模块显示，另一部分进入PID控制器控制蠕动泵加酸或加碱，最终使pH值控制在设定范围之内。该系统通过建立闭环控制系统以实现对pH值的控制。由于闭环控制可以有效地抑制闭环中各种扰动的影响,这将使得被控量趋近于设定值。 关键词：PID控制器 ARM A/D转换 The design of pH automatic control liquid filling machine based on STM32 Abstract pH control process widely in petroleum, chemical, pHarmaceutical, paper，wastewater treatment and water treatment, the pH value in the industrial production must be strictly controlled within a specified range, otherwise may cause the decline in product quality, raw material waste，production cannot be carried out smoothly, economic decline, or even cause environmental pollution, so the pH within a certain range of great significance. The core of this article is the pH automatic control system based on ARM. The pH sampling parts of the system uses the high-precision pH sensors to converted pH value into voltage values and uses the high performance A/D conversion module to collected voltage into digital quantity. The one part of the digital is displayed by the display module, the other part go into the PID controller to control the peristaltic pump adding acid or alkali, Finally ,which makes the pH control within the set. The system through the establishment of the closed loop control system in order to realize the control of the pH value. Because the closed loop control can effectively curb the influence of various disturbances in closed loop, which will make the charged amount tend to set value. Key Words: The PID controller ARM A/D c