【正文】 system, in our country has a very broad application prospects and practical significance. STC89C52 singlechip microputer as the core controller, this paper bined with digital temperature and humidity sensor DHT11 capacitance type, LCD display and 1602 simulation adjustment module, plete the design of hardware circuit. Through software programming control data downloaded to the singlechip microputer temperature and humidity display, threshold Settings. The design system can realize the function is as follows: through four buttons easily realize the adjustment of the upper limit of temperature and humidity, LCD screen can display the current environmental temperature and humidity in real time. Chip AT24C04 storage limit the maximum temperature and humidity can be permanent when power supply drop. When temperature or humidity transfinite alarm signal light lamp accordingly. Combined with the transistor and relay, the signal can also drive the relay on or cut off the fan rotation. This paper puts forward the design scheme, and discusses the vegetable greenhouses, the basic principle of the temperature and humidity measurement and control circuit. The circuit diagram and program flow chart are given with the active program. Keywords : Sensor； temperature and humidity； MCU； intelligent control 蔬菜大棚溫濕度控制系統(tǒng)的設(shè)計(jì) III 前 言 目前，隨著蔬菜大棚數(shù)量的迅速增多，人們對其性能要求也越來越高。 關(guān)鍵詞：傳感器；溫濕度；單片機(jī)；智能控制 II DESIGN OF CONTROL SYSTEM IN TEMPERATURE AND HUMIDITY FOR VEGETABLE GREENHOUSE Abstract In today39。文中提出了設(shè)計(jì)方案，討論了蔬菜大棚溫濕度巡回檢測與控制的基本原理，進(jìn)行了可行性論證。當(dāng)溫度或濕度超限后，報(bào)警信號點(diǎn)亮相應(yīng)報(bào)警燈。此次設(shè)計(jì)系統(tǒng)能實(shí)現(xiàn)的功能如下：通過四個(gè)按鍵方便地實(shí)現(xiàn)溫濕度上限的調(diào)整，液晶顯示屏能實(shí)時(shí)顯示當(dāng)前環(huán)境溫濕度。本文以 STC89C52 單片機(jī)為核心控制器，結(jié)合 DHT11 電容式數(shù)字溫濕度傳感器，液晶顯示屏 1602 顯示以及模擬調(diào)節(jié)模塊，完成電路硬件設(shè)計(jì)?，F(xiàn)在國外 有很多農(nóng)場對于溫室的智能控制系統(tǒng)有了一定的應(yīng)用，但其成本高昂，針對國內(nèi)大棚的特點(diǎn)是不能做到全面的普及。 目 錄 摘要 ............................................................................................................................... I Abstract ........................................................................................................................ II 前言 ............................................................................................................................. III 1 設(shè)計(jì)概述 ................................................................................................................... 1 國內(nèi)外智能控制系統(tǒng)的發(fā)展概況 ................................................................. 1 系統(tǒng)設(shè)計(jì)背景 ................................................................................................. 2 2 系統(tǒng)設(shè)計(jì)思想 .......................................................................................................... 3 3 系統(tǒng)硬件設(shè)計(jì) ........................................................................................................... 5 單片機(jī)模塊 ..................................................................................................... 5 單片機(jī)的選擇 ....................................................................................... 5 單片機(jī)最小系統(tǒng) ................................................................................... 6 溫濕度采集模塊 ............................................................................................. 7 液晶顯示模塊 ............................................................................................... 10 LCD1602 概述 .................................................................................... 11 LCD1602 基本參數(shù)及引腳功能 ........................................................ 11 報(bào)警模塊 ....................................................................................................... 13 控制模塊 ....................................................................................................... 13 閥值模塊 ....................................................................................................... 14 4 系統(tǒng)軟件程序的設(shè)計(jì) ............................................................................................. 15 軟件程序設(shè)計(jì) ............................................................................................... 15 仿真軟件介紹 ............................................................................................... 16 Proteus 簡介 ........................................................................................ 16 Keil C51 編譯器簡介 ......................................................................... 16 整體下載與調(diào)試 ........................................................................................... 17 USB 轉(zhuǎn)串口驅(qū)動安裝 ........................................................................ 17 下載程序 ............................................................................................. 17 調(diào)試 ..................................................................................................... 18 5 系統(tǒng)總體設(shè)計(jì) ........................................................................................................ 19 結(jié)論 ............................................................................................................................ 20 致謝 ............................................................................................................................ 21 參考文獻(xiàn) .................................................................................................................... 22 附 錄 .......................................................................................................................... 24 附錄 1：實(shí)物照片 ..................................................................................................... 24 附錄 2：原理圖 ......................................................................................................... 25 附 錄 3： 程序編寫 ..................................................................................................... 25 附錄 4：元器件清單 ................................................................................................. 29