【正文】 low cost, and can be realized by only a number of hardware circuit sensor and microcontroller. It establishes the munication between acquisition terminal and client, control threeway relay switch in accordance with the requirements of the client. The system achieves realtime monitoring and regulation of the greenhouse environment, to improve the best environment for the crops in order to achieve the purpose of high yield and quality. Key words: STC12C5A60S2, RFID, GSM, Security, Location III 目 錄 摘 要 ........................................................................................................................................ I Abstract ................................................................................................................................... II 目 錄 ......................................................................................................................................III 第 1 章 緒論 ........................................................................................................................... 1 課題的背景 .............................................................................................................. 1 課題的研究現(xiàn)狀 ...................................................................................................... 1 課題在國外的研究現(xiàn)狀 ............................................................................... 1 課題在國內(nèi)的研究現(xiàn)狀 ................................................................................ 2 課題研究的意義 ...................................................................................................... 2 設(shè)計(jì)的主要任務(wù) ...................................................................................................... 2 第 2 章 系統(tǒng)方案的提出 ....................................................................................................... 4 系統(tǒng) 設(shè)計(jì)思想 ........................................................................................................... 4 系統(tǒng)方案概述 ........................................................................................................... 4 系統(tǒng)方案框圖 .......................................................................................................... 4 系統(tǒng) 模塊化設(shè)計(jì) ...................................................................................................... 5 第 3 章 硬件電路 ................................................................................................................... 6 硬件電路概述 .......................................................................................................... 6 STC12C5A60S2 單片機(jī) ........................................................................................... 6 STC12C5A60S2 的簡介 ................................................................................ 6 STC12C5A60S2 引腳說明 ............................................................................ 7 STC12C5A60S2 在本系統(tǒng)中的具體應(yīng)用 .................................................... 8 非接觸式 IC 卡 — Mifare One 卡 ............................................................................ 9 Mifare One 卡的結(jié)構(gòu) .................................................................................... 9 Mifare One 卡的 功能 .................................................................................... 9 RFID 讀寫器 ........................................................................................................... 10 MFRC522 的特點(diǎn) ........................................................................................ 10 讀寫器的結(jié)構(gòu) ............................................................................................. 10 讀卡器 的工作過程 ......................................................................................11 溫 濕度傳感器 DHT11 ........................................................................................... 12 DHT11 的特點(diǎn) ............................................................................................. 12 DHT11 的典型應(yīng)用 ..................................................................................... 12 DHT11 的工作過程 ..................................................................................... 13 IV 氣體傳感器 MQ2 ................................................................................................. 13 MQ2 特點(diǎn) ................................................................................................... 13 MQ2 典型應(yīng)用電路 ................................................................................... 14 GSM 模塊 ............................................................................................................... 14 GSM 模塊簡介 ............................................................................................ 14 TC35 ............................................................................................................. 14 AT 指令 ........................................................................................................ 15 電機(jī)驅(qū)動(dòng)模塊 ........................................................................................................ 15 L298N 的特點(diǎn) .............................................................................................. 15 L298N 的控制直流電機(jī) .............................................................................. 16 多路循跡模塊 ........................................................................................................ 16 循跡原理 ..................................................................................................... 16 多路循跡模塊 ...................................................................................................... 17 光電開關(guān) ................................................................................................... 17 第 4 章 系統(tǒng)調(diào)試 ................................................................................................................. 18 硬件電路調(diào)試 .............