【正文】 基于 AT89S51 的溫度控制系統(tǒng) 1 摘要 摘 要 ： 本設(shè)計是以一個紙盒為控制對象，以 AT89S51 為控制系統(tǒng)核心，通過單片機系統(tǒng)設(shè)計實現(xiàn)對箱子溫度的顯示和控制功能。本溫度控制系統(tǒng)是一個閉環(huán)反饋調(diào)節(jié)系統(tǒng)，由溫度傳感器 LM35 對紙盒溫度進(jìn)行檢測，經(jīng) A/D 轉(zhuǎn)換芯片得到相應(yīng)的溫度值，將所得的溫度值與設(shè)定溫度值相比較得到偏差。通過對偏差信號的處理獲得控制信號，去調(diào)節(jié)加熱器的通斷，從而實現(xiàn)對保溫箱溫度的控制。本文主要介紹了保溫箱溫度控制系統(tǒng)的工作原理和設(shè)計方法，論文主要由三部分構(gòu)成。① 系統(tǒng)整體方案設(shè)計。② 硬件設(shè)計，主要包括溫度檢測電路、 A/D 轉(zhuǎn)換電路 、顯示電路、鍵盤設(shè)計和控制電路。③ 系統(tǒng)軟件設(shè)計。 關(guān)鍵詞 ： 單片機；傳感器；溫度檢測 Abstract Abstract: The design is based on a thermal insulation box as the control object, with AT89S51 as the control system core, through the SCM system design and implementation of temperature control and display function. The temperature control system is a closedloop feedback control system, which is posed of a temperature sensor LM35 temperature detection, through the A / D conversion chip corresponding temperature value, the temperature value and temperature value is pared with that obtained deviation. Deviation through the signal processing control signal to control the onoff, heater, thus realizing the temperature display and control. This paper introduces the temperature control system principle of work and the design method, the paper mainly consists of three parts. The system overall plan design. The hardware design, including the temperature detection circuit, A / D conversion circuit, display circuit, keyboard circuit design and control. The system software design. Key words: single chip microputer。 sensor。 temperature detection 基于 AT89S51 的溫度控制系統(tǒng) 2 目錄 摘要 .................................................................................................................................................. 1 Abstract ............................................................................................................................................. 1 目錄 .................................................................................................................................................. 2 第 1 章 緒論 ...................................................................................................................................... 3 課題設(shè)計背景和目的 ............................................................................................................. 3 國內(nèi)外研究狀況和發(fā)展趨勢 ................................................................................................... 3 溫度檢測的主要方法 ............................................................................................................. 4 課題設(shè)計的主要內(nèi)容 ............................................................................................................. 4 第 2 章 系統(tǒng)總體方案設(shè)計 ................................................................................................................. 6 系統(tǒng)設(shè)計方案 ........................................................................................................................ 6 中央處理器 AT89S51 ............................................................................................................. 7 溫度傳感器 LM35 ................................................................................................................10 ADC0808 ............................................................................................................................. 11 數(shù)碼管顯示 .........................................................................................................................13 控制電路 ..............................................................................................................................15 半導(dǎo)體制冷片 .......................................................................................................................16 第 3 章 系統(tǒng)軟件仿真 .......................................................................................................................19 keil uVision...........................................................................................................................19 程序設(shè)計 ..............................................................................................................................20 proteus 軟件介紹 ..................................................................................................................23 仿真 ....................................................................................................................................27 第 4 章 PCB 板制作 ..........................................................................................................................29 Protel DXP 軟件介紹 ............................................................................................................29 原理圖 .................................................................................................................................33 PCB 板圖 .............................................................................................................................34 實物圖 .................................................................................................................................35 結(jié)論 .................................................................................................................................................37 致謝 .................................................................................................................................................38 參考文獻(xiàn) ..........................................................................................................................................39 基于 AT89S51 的溫度控制系統(tǒng) 3 第 1 章 緒論 課題設(shè)計背景和目的 在現(xiàn)代化的工業(yè)生產(chǎn)中電流、電壓、溫度、壓力 、流量、流速和開關(guān)量都是常用的主要被控參數(shù)。溫度作為一個基本物理量，它是一個與人們的生活環(huán)境、生產(chǎn)活動密切相關(guān)的重要物理量。在現(xiàn)代化的工業(yè)生產(chǎn)過程中溫度作為一種常用的主要被控參數(shù)，在很多生產(chǎn)過程中我們需要對溫度參數(shù)進(jìn)行檢測。例如：在冶金工業(yè)、化工生產(chǎn)、電力工程、造紙行業(yè)、機械制造和食品加工等諸多領(lǐng)域中，人們都需要對各類加熱爐、熱處理爐、反應(yīng)爐和鍋爐中的溫度進(jìn)行檢測。采用單片機來對溫度進(jìn)行控制，不僅具有控制方便、組態(tài)簡單和靈活性大等優(yōu)點，而且可以大幅度提高被控溫度的技術(shù)指標(biāo)，從而能夠大大提高產(chǎn)品的