【正文】 戶外電子設(shè)備溫度控制系統(tǒng)設(shè)計(jì) I 戶外電子設(shè)備溫度控制系統(tǒng)設(shè)計(jì) The design of control system of the outdoor temperature of electronic equipment 戶外電子設(shè)備溫度控制系統(tǒng)設(shè)計(jì) II 摘 要 溫度控制系統(tǒng)是日常生活與工業(yè)控制中最重要而普遍的自動(dòng)控制系統(tǒng)。 隨著電子技術(shù)的發(fā)展， 單片機(jī) 早 已成為電子 設(shè)備研發(fā)和生產(chǎn) 中首選的控制 芯片 。本文介紹一種 使用STC89C52 為核心，以 DS18B20 為溫度 采集設(shè)備，以 LCD12864 為顯示屏幕，以 AT24C02作為掉 電存儲(chǔ)設(shè)備 設(shè)計(jì)而成的戶外電子設(shè)備溫度控制系統(tǒng) 。通過對(duì) 電子 器件 資料的查閱和實(shí)際嘗試 ，設(shè)計(jì)硬件電路 。 采用溫度傳感器 DS18B20 使用 IIC 總線 技術(shù) 來 獲取所在區(qū)域?qū)崟r(shí) 溫度， STC89C52 對(duì)多點(diǎn)的溫度進(jìn)行實(shí)時(shí)巡檢 同時(shí) 從矩陣鍵盤 歷史 輸入的溫度值進(jìn)行 比較 ， 該控制 系統(tǒng) 通過 LCD12864 實(shí)時(shí)輸出溫度信息，超出預(yù)定值自動(dòng)報(bào)警 。 明確系統(tǒng)功能后編寫 相關(guān)程序 語(yǔ)言， 通過仿真，對(duì)整個(gè) 溫度控制 系統(tǒng)進(jìn)行 了 調(diào)試 與分析。最終實(shí)現(xiàn) 了實(shí)時(shí) 溫度采集、顯示、控制 與記錄 等功能。經(jīng)實(shí)際制作表明該 溫度控制系統(tǒng) 能夠 實(shí)現(xiàn) 所需功能，具有體積小 巧 、操作 方便 、 可靠性高、測(cè)量精準(zhǔn)高、實(shí)時(shí)性好等特點(diǎn) ， 適合 戶外電子設(shè)備溫度控制 。 關(guān)鍵詞： 溫度控制； STC89C52； DS18B20 戶外電子設(shè)備溫度控制系統(tǒng)設(shè)計(jì) III Abstract Temperature control system is one of the most important and universal automatic control system in daily life and industrial control. With the development of electronic technology, SCM has bee the first choice in the development and production of electronic equipment control chip. This paper introduces a kind of outdoor electronic equipment temperature control system, which uses STC89C52 as the core, DS18B20 as temperature acquisition device, LCD12864 as the display screen, and AT24C02 as the outdoor electronic equipment. Based on the access to electronic devices and the actual attempt, the design of hardware circuit. Using IIC bus technology to obtain the area where the realtime temperature by temperature sensor DS18B20, STC89C52 of multipoint temperature of realtime inspection at the same time, from the temperature of the matrix keyboard input history values were pared, the control system through LCD12864 realtime output temperature information beyond pre set value automatic alarm. After the system function is clear, the programming language is written, and the whole temperature control system is debugged and analyzed by simulation. The function of realtime temperature acquisition, display, control and recording is realized. The actual production shows that the temperature control system can realize required functions and has the characteristics of small volume, convenient operation, high reliability, high precision of measurement, realtime good, suitable for outdoor electronic equipment temperature control. Keywords: temperature control。 STC89C52。 DS18B20戶外電子設(shè)備溫度控制系統(tǒng)設(shè)計(jì) IV 目 錄 摘 要 ............................................................................................................................. II Abstract ..........................................................................................................................III 1 前言 ............................................................................................................................. 1 電氣自動(dòng)化相關(guān)技術(shù) ......................................................................................... 1 嵌入式系統(tǒng)的現(xiàn)狀及技術(shù) ................................................................................... 2 電子設(shè)備溫度控制系統(tǒng)發(fā)展趨勢(shì)與意義 ............................................................. 3 電子設(shè)備溫度控制系統(tǒng)的目的與功能 ................................................................ 3 2 系統(tǒng)的理論分析 ........................................................................................................... 5 自動(dòng)控制系統(tǒng)概述 ............................................................................................. 5 PID 技術(shù)原理 ..................................................................................................... 5 PWM 控制原理 ................................................................................................... 6 3 系統(tǒng)硬件電路設(shè)計(jì) ........................................................................................................ 8 系統(tǒng)供電電源設(shè)計(jì) .............................................................................................. 8 處理器 STC89C52............................................................................................... 9 液晶顯示電路 ....................................................................................................10 USBTTL 通信模塊 ...........................................................................................12 溫度參數(shù)傳感器 DS18B20 .................................................................................13 掉電存儲(chǔ)電路 AT24C02 .....................................................................................16 看門狗電路 ........................................................................................................17 溫濕度控制電路 ................................................................................................18 溫度調(diào)節(jié)電路 .......................................................................................18 濕度調(diào)節(jié)電路 .......................................................................................18 聲光報(bào)警電路 ...................................................................................................19 3 系統(tǒng)軟件設(shè)計(jì) ..............................................................................................................21 編譯環(huán)境介紹 .................................................................................................21 PID 控制溫濕度 ..............................................................................................22 溫濕度傳感器軟件驅(qū)動(dòng) ....................................................................................25 串口通信 ..........................................................................................................27 PWM 調(diào)制 .........................................................................................................29 軟件流程圖 .......................................................................................................29 4 系統(tǒng)調(diào)試與檢測(cè)控制效果 ............................................................................................31