以單片機(jī)為核心的溫室智能控制系統(tǒng)設(shè)計(jì)

目錄

0 前言 1
1 概述 2
1.1 系統(tǒng)的基本功能 2
1.2 系統(tǒng)的主要技術(shù)參數(shù) 2
1.3 本文的主要工作 2
2 系統(tǒng)的組成及工作原理 3
3 系統(tǒng)硬件電路的設(shè)計(jì) 4
3.1 方案的選擇和論證 4
3.1.1 傳感器的選擇 4
3.1.2 單片機(jī)的選擇 5
3.1.3 信號(hào)采集通道的選擇 5
3.2 系統(tǒng)單元電路的設(shè)計(jì) 6
3.2.1 信號(hào)采集電路 6
3.2.2 信號(hào)轉(zhuǎn)換與處理電路 12
3.2.3 數(shù)碼顯示器LED 29
3.2.4 按鍵設(shè)置電路 35
3.2.5 繼電器電路 37
3.2.6 電源電路 39
4 系統(tǒng)軟件設(shè)計(jì) 40
4.1 溫室智能控制系統(tǒng)程序流程圖 40
4.1.1 主程序流程圖 40
4.1.2 中斷子程序流程圖 40
4.1.3 鍵掃描程序流程圖 42
4.2 部分程序 43
4.2.1 主程序 43
4.2.2 A/D轉(zhuǎn)換程序 47
4.2.3 鍵掃描程序 49
5 系統(tǒng)的抗干擾措施 51
6 技術(shù)經(jīng)濟(jì)分析 52
7 結(jié)論 53
致謝 54
參考文獻(xiàn) 55
附錄A 56
附錄B 66

摘要

本設(shè)計(jì)是以溫室內(nèi)的溫度和濕度作為被控對(duì)象，采用單片機(jī)AT89C51作為系統(tǒng)的控制核心，能夠?qū)崿F(xiàn)人工設(shè)定，自動(dòng)控制，實(shí)時(shí)顯示等功能。
設(shè)計(jì)采用溫度傳感器LM35和濕度傳感器HM1500分別對(duì)溫室內(nèi)的溫度和濕度進(jìn)行測(cè)量，通過單片機(jī)AT89C51分別與溫度傳感器LM35和濕度傳感器HM1500通訊后，獲得實(shí)時(shí)溫度值和濕度值，并利用單片機(jī)內(nèi)部程序?qū)崿F(xiàn)對(duì)被控量的控制。
對(duì)被控對(duì)象進(jìn)行人工設(shè)定，并在LED上顯示其實(shí)時(shí)值。若當(dāng)前測(cè)量值不在設(shè)置范圍值之內(nèi)時(shí)，系統(tǒng)則通過繼電器的導(dǎo)通來控制相應(yīng)裝置工作，最后使被控對(duì)象保持在設(shè)定范圍值內(nèi)。因?yàn)槔^電器可以使強(qiáng)電與弱電隔離，所以系統(tǒng)的安全性能提高。
關(guān)鍵詞：溫室；溫度；濕度；單片機(jī)；控制
Abstract

The design is based on the greenhouse temperature and humidity. It chooses AT89C51 single-chip microcomputer to control the system. It can achieve the artificial set temperature and humidity range,display temperature and humidity in time, automatic control temperature and humidity and have other functions.
The design uses the temperature transducer LM35 and the humidity transducer HM1500, which make a measurement on the greenhouse temperature and humidity. AT89C51 single-chip microcomputer gets the real-time temperature and humidity values, after it communicate with the temperature transducer LM35 and the humidity transducer HM1500. Single-chip microcomputer with internal procedures can achieve the volume control.
We can artificially set the values, which can be displayed on the LED in time.If the current measurement values are not within the set scope, the system controls the relay turn-on to control the corresponding device. Finally, the controlled object can be kept in the scope of set values. Strong and weak electrical isolation can improve the safety of the system.
Keywords: greenhouse; temperature; humidity; single chip; control