恒溫恒濕試驗箱控制系統說明書(已修改)

　

【正文】 2021 屆畢業生 畢業設計說明書 題 目 : 恒溫恒濕試驗箱控制系統的設計 院系名稱： 電氣工程學院 專業班級： 電氣 F0802 學生姓名： 宋海華 學 號： 202148720201 指導教師： 王偉生 教師職稱： 講師 2021 年 5 月 30 日 I 摘 要 隨著我國現代農業的發展和工業產品研制的需要， 恒溫恒濕 試驗 箱的應用越來越廣 , 生產、科研對它的要求也越來越高。要求它的性能價格比更高 , 使用壽命更長 , 使用費用更少 (省電 ) , 響應速度更快。近幾年來，我國從國外引進了大批試驗系統，為我國工業產品的研制和定型發揮了重要作用，但由于其本身的復雜性，使得試驗箱在運行中出現了許多問題，而且出現了問題不能及時解決，大大延長了試驗周期，影響了產品的研制工作。而產生這些現象的原因是對綜合試驗的工作原理不了解。為此，本文對試驗箱的基本工作原理作出了一些簡要闡述。 恒溫恒濕試驗箱 是利用一定的方式將箱內的溫度和濕度調節到給定值，并在該條件下進行實驗，達 到實驗反應要求。即能同時施加溫度、濕度應力的試驗箱。簡而言之是指溫度和濕度都能控制在指定范圍內的試驗箱。 恒溫恒濕試驗箱主要用于檢測材料在各種環境下的性能的設備，并可試驗各種材料耐熱、耐寒、耐干、耐濕性能。適合電子、電器、通訊、儀表、車輛、食品、化學、建材、醫療、航天等制品檢測質量之用。 關鍵詞： 恒溫恒濕 試驗箱 單片機控制系統 限溫報警系統 II Title The Design of Constant Temperature and Humidity Chamber Control System Abstract With the development of China39。s modern agriculture and the need of industrial products developed, the applications of the constant temperature and humidity box bee more widely. production, scientific research and its increasingly high requirements. higher costeffective,longer life,less costs (saving) and faster response are required. In recent years,our country has imported a large number of test systems from abroad, which has played an important role in the development of China39。s industrial products and stereotypes,However, due to its own plexity, making the chamber a lot of problems in the operation,and problems can not be solved promptly, which greatly prolong the test cycle, affecting the product manufacture work. The reason of these phenomena is do not understand the working theory of the prehensive test. So, we made some brief description of the basic working theory of the chamber. The constant temperature and humidity box is a box which can adjust the temperature and humidity inside to the setpoint in a certain way,the experiments and the response requirements of the experimental under this condition,which can imposed temperature and humidity stress to the chamber at the same time. In short,it is a box which can put the temperature and humidity within a specified range. The constant temperature and humidity chamber is the device that mainly used for the detection performance of materials in various environments,which Can experiment various materials performance of heat, cold, resistance to dry and moisture . useing for the testing quality of electronic, electrical, munications, instrumentation, vehicles, food, chemical, building materials, medical, aerospace and other products. Keywords Constant Temperature and Humidity Single Chip Control System Limit Temperature Alarm System III 目 次 1 緒論 .............................................................................................................................1 文獻綜述 ..................................................................................................................1 課題的主要內容 ......................................................................................................1 課題的研究方案 ......................................................................................................1 2 設計的理論基礎 .........................................................................................................3 單片機的發展概況 ...................................................................................................3 AT89C51 單片機系列介紹 .......................................................................................3 DS18B20 數字溫度傳感器 .......................................................................................4 KSC6V濕度傳感器 ................................................................................................4 RS232 總線接口芯片 MAX232 .............................................................................5 3 硬件電路設計 .............................................................................................................6 主控模塊設計 ..........................................................................................................6 硬件系統電 路連接設計 ..........................................................................................8 4 PID 控制算法 ............................................................................................................. 11 PID 控制的發展 ...................................................................................................... 11 PID 控制理論 .......................................................................................................... 11 PID 控制算法 ..........................................................................................................12 5 軟件設計 ...................................................................................................................14 軟件設計綜述 ........................................................................................................14 軟件流程圖 ............................................................................................................14 結論 ................................................................................