【正文】 ?？粕厴I(yè)設計（論文） I 摘 要 隨著人們生活水平的提高，太陽能熱水器的使用已相當普及。與之相配套的控制儀也相繼問世。然而，目前市場上的各種熱水器控制電路還與理想要求相差甚遠。消費者需要真正的“自動”控制，以實現使用的最簡單化。但與之配套的控制器卻還一直處于研究和開發(fā)階段，為解決水溫水位的自動控制問題，本電路專門設計了水溫的實時監(jiān)測，并在設計中，將水位多級化，實現更精確的測量。 本次設計運用 AT89C52 單片機，設計了一種自動控制電路，該電路用于太陽熱水器。當或者更多點的液位檢測。這篇論文詳細介紹了基使用熱水器時，可以自動進行溫度檢 測和液位檢測，使太陽能自動補水或排水，真正做到最簡單化。并且該電路易于擴展，可實現多點的溫度檢測，于單片機的太陽能熱水器自動控制系統(tǒng)組成、硬件設計。 關鍵詞： 單片機；自動控制；太陽能熱水器；溫度檢測 。 水位檢測 ?？粕厴I(yè)設計（論文） II Abstract With the improvement of living standard, the use of all water heaters have been very popular. Matched with the control device is also one after another. However, the current market a variety of water heater control circuit is also far from the ideal requirement. Consumers need to really automatic control, in order to achieve the most simplistic use. but are still acpanying controller has been in research and development phase, To solve the temperature and water level control problems, this circuit specifically designed for realtime monitoring of water temperature, and in the design, Multilevel of the water level to achieve more accurate measurements. Wood plays designed using AT89C52 microcontroller, the design of a control circuit, the circuit for the solar water heater. When using the heater, it will automatically detect the temperature and liquid level detection, the solar autoreplenishment, or drainage, truly the most simplistic. And easy to extend this circuit can achieve multipoint temperature measurement, level detection or more points. This paper introduces the microcontrollerbased automatic control system for solar water heater posed of hardware design. Key words： microcontroller。 control。 solar water heater。 temperature detection 。 level detection ?？粕厴I(yè)設計（論文） III 目 錄 摘 要 .......................................................................................................................... I Abstract ..................................................................................................................... II 目 錄 ........................................................................................................................III 第 1 章 緒 論 ........................................................................................................... 1 本設計的目的和意義 ................................................................................ 1 太陽能熱水器的發(fā)展概況及市場競爭分析 ............................................ 1 太陽能熱水器的應用 ................................................................................ 2 第 2 章 系統(tǒng)設計 ..................................................................................................... 3 設計原理 .................................................................................................... 3 方案論證 .................................................................................................... 3 方案一 ............................................................................................. 3 方案二 ............................................................................................. 3 方案選擇 ......................................................................................... 4 第 3 章 硬件電路設計 ............................................................................................. 5 基本原理框圖 ............................................................................................ 5 太陽能熱水器控制裝置主要組成 ................................................. 5 太陽能熱水器控制裝置的工作原理 ............................................. 6 各部分電路原理 ........................................................................................ 6 最小系統(tǒng) ......................................................................................... 6 顯示電路 ......................................................................................... 9 按鍵電路 ....................................................................................... 11 蜂鳴器電路 ................................................................................... 11 電機電路 ....................................................................................... 12 液位檢測電路 ............................................................................... 13 溫度檢測電路 ............................................................................... 15 電源電路 ....................................................................................... 16 第 4 章 軟件設計 ................................................................................................... 17 軟件分析 .................................................................................................. 17 I/O 口分配 ................................................................................................ 17 軟件流程圖 .............................................................................................. 17 第 5 章 實現功能 ................................................................................................... 19 液位檢測 .................................................................................................. 19 專科生畢業(yè)設計（論文） IV 溫度檢測 .................................................................................................. 19 可擴展功能 .............................................................................................. 19 第 6 章 結 論 ......................................................................................................... 20 參考文獻 ................................................................................................................. 21 致 謝 ....................................................................................................................... 22 附 錄 ....................................................................................................................... 23 ?？粕厴I(yè)設計（論文） 1 第 1章 緒 論 本設計的目的和意義 本設計具有很強的實用性 ,用成本低廉的電阻式傳感器以及電極配以單片機