【正文】 性。 SHT10 使用類似于 I2C 總線的時(shí)序與單片機(jī)進(jìn)行通信，由于它高度集成，已經(jīng)包括 A/D 轉(zhuǎn)換電路，所以使用方便，而且準(zhǔn)確、耐用。 LCD1602 能夠分兩行顯示數(shù)據(jù)，第一行顯示溫度，第二行顯示濕度。 關(guān)鍵詞 ： STC89C52RC， SHT10， I2C 總線，獨(dú)立式鍵盤，溫濕度自動(dòng)控制 Abstract: This design is an automatic temperature and humidity controller for greenhouses, with the STC89C52RC MCU being its main controller. It uses the SHT10 as the temperature and humidity sensor, and the LCD1602 to display the messages. The SHT10 uses a timing sequence much like the I2C to municate with the microcontroller. Because it’s a highly integrated chip, it already includes an analog to digital converter. Therefore, it’s quite convenient to use, and also accurate and durable. The LCD1602 can display two lines of messages, with the first line for temperature and the second line for humidity. The design can measure the temperature and humidity in a greenhouse, and then display it on a LCD1602. Meanwhile, it pares the data with the set limit. If the limit is exceeded, then the system will send out a warning using a buzzer and activate the temperature and humidity controlling equipment. Besides, the set limit can be modified with the independent keyboard. Through schematic design and Proteus simulation, the feasibility of this design has been proved. Keywords: STC89C52RC, SHT10, I2C bus, independent keyboard, temperature and humidity control基于 STC89C52RC 單片機(jī)的大棚溫濕度自動(dòng)控制系統(tǒng) 目 錄 1 前言 ............................................................................................................................... 1 2 總體方案設(shè)計(jì) ............................................................................................................... 3 溫濕度控制系統(tǒng)的設(shè)計(jì)指標(biāo)要求 .................................................................... 3 系統(tǒng)設(shè)計(jì)的原則 ................................................................................................ 3 可靠性 ..................................................................................................... 3 性價(jià)比 ..................................................................................................... 3 方案比較 ............................................................................................................ 4 方案一 ..................................................................................................... 4 方案二 ..................................................................................................... 4 方案論證 ............................................................................................................ 5 方案選擇 ............................................................................................................ 5 3 單元模塊設(shè)計(jì) ............................................................................................................... 6 各單元模塊功能介紹及電路設(shè)計(jì) .................................................................... 6 單片機(jī)最小系統(tǒng) ..................................................................................... 6 液晶顯示模塊 ......................................................................................... 8 溫濕度傳感器模塊 ................................................................................. 8 報(bào)警電路的設(shè)計(jì) ................................................................................... 9 輸出電路設(shè)計(jì) ....................................................................................... 10 電源的設(shè)計(jì) ........................................................................................... 12 按鍵電路設(shè)計(jì) ..................................................................................... 13 串口通信電路 ....................................................................................... 14 元件清單 .......................................................................................................... 15 關(guān)鍵器件的介紹 .............................................................................................. 17 STC89C52RC ......................................................................................... 17 SHT10 溫濕度傳感器 ............................................................................ 19 4 系統(tǒng) 軟件設(shè)計(jì) ............................................................................................................. 22 軟件設(shè)計(jì)的總體結(jié)構(gòu) ...................................................................................... 22 主要模塊的設(shè)計(jì)流程框圖 .............................................................................. 24 主程序流程圖 ....................................................................................... 24 SHT10 子程序流程圖 ............................................................................ 25 基于 STC89C52RC 單片機(jī)的大棚溫濕度自動(dòng)控制系統(tǒng) LCD1602 子程序流程圖 ....................................................................... 27 輸出控制子程序流程圖 ....................................................................... 28 鍵盤掃描子程序流程圖 ....................................................................... 29 軟件設(shè)計(jì)所用工具 .......................................................................................... 31 Keil uVision4 .......................................................................................... 31 Proteus .................................................................................................... 31 5 系統(tǒng)調(diào)試 ..................................................................................................................... 32 用 Proteus 搭建仿真總圖 ................................................................................ 32 用 Keil 對(duì)程序進(jìn)行調(diào)試、編譯 ..................................................................... 33 6 結(jié)論 ............................................................................................................................. 36