【正文】 一些行業(yè)、設(shè)備或場所中，溫度 測量的準(zhǔn)確度、精度、實時性對民生大計起著至關(guān)重要的作用，比如，養(yǎng)雞場的孵化箱對溫度控制有著非常嚴(yán)格的要求，溫度測量不準(zhǔn)，控制不精確就會造成小雞孵化率和成活率的降低，從而導(dǎo)致養(yǎng)殖經(jīng)濟(jì)效益的減少；再如國家糧食儲備倉庫的溫度測量和控制系統(tǒng)，我國是一個農(nóng)業(yè)大國，每年都有大量的新糧收獲，也有部分陳糧積壓，一旦出現(xiàn)問題會直接導(dǎo)致儲糧儲備的浪費和損失，給國家和人民造成了巨大的經(jīng)濟(jì)損失，情況嚴(yán)重的甚至?xí)绊懨裼蒙罴Z食的正常供應(yīng)，糧倉環(huán)境成為決定糧食質(zhì)量的關(guān)鍵因素。 關(guān)鍵詞： STC89C51， TC35I， DS18B20， 控制 XXXXXX 學(xué)院畢業(yè)設(shè)計（論文） 第 II 頁 The temperature monitoring system based on GSM ABSTRACT With the development of economic and technology， the field of temperature monitoring has bee an increasingly widespread, but the traditional shortrange wired or wireless transmission,such as the workplace of poor environment monitoring, onsite risk, noise, and the staff should not stay in, etc, can not meet certain occasions. In these occasions, the shortings of cable and shortrange wireless transmission are exposed clearly, so to find a more secure, more reliable data transmission control system is necessary. The system is a temperature monitor based on the GSM wireless control. It’s a remote data control system specifically designed for the above situation. The GSM work is a public, technical reliability and security work, including an SMS technology which is ideal for data transmission and control. The system is by a highly integrated temperature sensor DS18B20 to collect temperature data, a microcontroller STC89C51 to control and monit , a LED to show the field data, a button to set the upper temperature and a serial port to municate with TC35I module. Temperature acquisition and setting, data transmission and control have been achived by the system. Basically, the system can be used to the abovementioned occasion safely and stably. KEY WORDS : STC89C51， TC35I， DS18B20， control XXXXXX 學(xué)院畢業(yè)設(shè)計（論文） 第 III 頁 目 錄 摘 要 ..................................................... Ⅰ ABSTRACT ................................................... Ⅱ 1 緒論 ......................................................1 概述 .................................................1 目前遠(yuǎn)程監(jiān)控的發(fā)展現(xiàn)狀 ................................1 本文研究的主要內(nèi)容和方法 ..............................3 2 系統(tǒng)結(jié)構(gòu) ..................................................5 系統(tǒng)結(jié)構(gòu)圖 ...........................................5 按鍵功能模塊 .............................................. 5 測溫模塊 .................................................. 5 GSM 無線通訊模塊 ........................................... 5 顯示模塊 .................................................. 5 MCU 核心控制模塊 ........................................... 5 各模塊方案的選擇 .....................................5 MCU 的選擇 ................................................. 5 按鍵功能模塊的選擇 ........................................ 6 測溫模塊的選擇 ............................................ 6 GSM 無線通訊模塊 ........................................... 7 顯示模塊 .................................................. 7 3 DS18B20 簡介 ...............................................8 單總線 (1Wire)的基本原理 ..............................8 概述 ...................................................... 8 命令序列 .................................................. 8 信號方式 ...................................................9 DS18B20 介紹及測溫電路設(shè)計 ............................9 DS18B20 的主要特性 ......................................... 9 DS18B20 的外形和內(nèi)部結(jié)構(gòu) .................................. 10 DS18B20 工作原理 .......................................... 10 測 溫電路設(shè)計 ............................................. 11 XXXXXX 學(xué)院畢業(yè)設(shè)計（論文） 第 IV 頁 DS18B20 的時序圖 .......................................... 12 DS18B20 的 ROM 和存儲器命令 ................................ 14 小結(jié) : ................................................... 15 4 TC35I 模塊簡介 ............................................ 16 TC35i 通訊模 塊電路 ................................... 16 TC35i 模塊的功能結(jié)構(gòu) ...................................... 16 TC35i 模塊的對外接口電路 .................................. 17 TC35I 模塊的外圍電路設(shè)計 .................................. 18 TC35I 模塊的初始化 ........................................ 20 相關(guān)的 GSM AT 指令 ................................... 20 PDU 簡介 ............................................ 21 利用通訊模塊實現(xiàn)短消息發(fā)送與接收 ..................... 22 常用 AT命令 .............................................. 22 調(diào)試實例 ................................................. 22 小結(jié) : ................................................... 25 5 系統(tǒng)硬件 ................................................. 26 MCU— STC89C51 的簡介 ................................. 26 主要性能 ................................................. 26 引腳結(jié)構(gòu) ................................................. 26 按鍵模塊電路 ........................................ 29 鍵盤的工作方式 ........................................... 30 本系統(tǒng)按鍵接口電路圖 ..................................... 30 DS18B20 的電路圖 ..................................... 31 LED 數(shù)碼管顯示的電路 ................................. 31 LED 顯示器結(jié)構(gòu)與原理 ...................................... 31 LED 顯示器與顯示方式 ...................................... 32 本系統(tǒng)的 LED 電路 ......................................... 33 GSM 與單片機(jī)通訊 ..................................... 33 電源電路 ............................................ 34 XXXXXX 學(xué)院畢業(yè)設(shè)計（論文） 第 V 頁 小結(jié)： .................................................. 35 6 系統(tǒng)軟件 ................................................. 36 主程序 .............................................. 36 DS18B20 程序 ......................................... 36 定時器中斷程序 ...................................... 38 外部中斷程序 ........................................ 40 與 GSM 相關(guān)的程序 .................................... 40 小結(jié) : ................................................... 40 結(jié)束語 ..............................................