【正文】 當前值、設(shè)定值。這樣就可以同時在發(fā)生意外的時候及時的在總臺和發(fā)生意外的所在點產(chǎn)生聲光報警，及時的疏散意外所在點的人群并告之總臺的控制端。這不僅在一般的測量儀表中，而且在分析儀表、實驗室儀表與生物醫(yī)學(xué)儀表中反映出來。 在現(xiàn)代化建設(shè)中，人們對儀器儀表所能起到的監(jiān)控作用，在技術(shù)上有著高層次的要求，因而儀器儀表工業(yè)是促進國民經(jīng)濟各部門技術(shù)進步，進行技術(shù)改造，提高勞動生產(chǎn)率和社會經(jīng)濟效益，開發(fā)與節(jié)約能源和 材料的先導(dǎo)工業(yè)。 1 姚豐、劉念聰：一種單片機智能煤氣系統(tǒng)的設(shè)計 [J]，天津職業(yè)大學(xué)學(xué)報 2021 年 6 月 第 13 卷 第 13 期。這就對煤氣自動報警的器的設(shè)計更加迫切 2。氣體燃料的應(yīng)用和普及，伴之而來的是氣體泄漏造成的中毒、爆炸、火災(zāi)等事故也時有發(fā)生?；诖隧椧?guī)定，煤氣泄漏自動報警 實現(xiàn)智能化勢在必行 1。人們對居住環(huán)境要求的日見增高，體現(xiàn)在希望住宅不僅更便利、舒適 而且更安全。每年，因煤氣泄露造成的煤氣中毒事故中，因使用熱水器不當或產(chǎn)品本身的質(zhì)量問題 ,造成的一氧化碳中毒事故，全國均有不少事例 .有甚者 ,因室內(nèi)煤氣濃度過高，引起煤氣爆炸的事故也不少見。 V 附 錄 2 焊接實物圖 ............................................... 錯誤 !未定義書簽。 通過 NAP505 電化學(xué)一氧化碳氣體傳感器 對煤氣進行檢測，將所得的濃度值與設(shè)定濃度值相比較得到偏差。本課題設(shè)計煤氣報警采用了 AT89S52 單片機為報警器的核心部件，對煤氣報警器進行控制 。 關(guān)鍵詞 ：單片機 煤氣濃度 報警器 II Design of the coal gas’ alarm device ABSTRACT There are many coal gas alarm’s devices in our lives. These devices will alarm after the coal gas leaking. We call them household or industy appliances. This paper introduces the design of a coal gas alarm’s device that use the AT89S52 SCM as the most important controller. It is a coreponents that control the whole programs and circuit of the coal gas alarm’ device. The appliance monitors the density of coal gas with the sensor of NAP505 and pares the current density with the setting density. We get the control signal through the dealing with the deviation signal and then sent a alarm signal that is memoried in a RAM of DS12887. The analog signal of eight densities of the coal gas are transformed into the digital signal with the A/D converter, in addition which is cotrolled with the keyboard. We can monitor the leak of coal gas in the house or industy. The hardware design of circuits is reasonable and the performance of the coal gas alarm’s device is safe and reliable. Keywords: SCM Density Alarm’ device III 目 錄 摘 要 ............................................................................................................ I ABSTRACT ............................................................................................... II 1 前言 ........................................................................................................ 1 研究背景 ................................................................................................. 1 研究意義 ................................................................................................. 2 研究內(nèi)容 ................................................................................................. 2 2 系統(tǒng)總體設(shè) 計 ....................................................................................... 3 方案的選擇 ............................................................................................. 3 系統(tǒng)流程框圖 ......................................................................................... 3 3 硬件系統(tǒng)設(shè)計 與傳感器選用 .............................................................. 4 主機部分 ................................................................................................. 4 單片機 ................................................................................... 4 實時時鐘芯片及其電路 ........................................................ 6 看門狗定時器及復(fù)位電路 ........................................................ 8 電源電路 ............................................................................................. 9 功能模塊部分 ......................................................................................... 9 的數(shù)據(jù)采集單元 ................................................................. 10 的人機接口電路模塊 ........................................................... 12 數(shù)據(jù)處理模塊 .................................................................................... 15 聲光報警模塊 .................................................................................... 16 IV 下載電路 DIY .............................................................................. 17 傳感器的選 用 ....................................................................................... 18 型電化學(xué)式傳感器 ............................................................. 19 半導(dǎo)體氣體傳感器 ................................................................... 20 硬件設(shè)計小結(jié) ....................................................................................... 22 4 軟件設(shè) 計 .............................................................................................. 23 主程序設(shè)計 ........................................................................................... 23 初始化程序和主程序 ........................................................................ 23 中斷服務(wù)程序 .................................................................................... 27 功能實現(xiàn)主要子程序 ........................................................................... 28 采集程序 ............................................................................................ 28 數(shù)據(jù)處理模塊 .................................................................................... 30 報警記錄和報警模塊 ........................................................................ 31 人機對話子程序設(shè)計 ........................................................................ 31 小結(jié) ...................................................................................................... 34 5 系統(tǒng)調(diào)試與分析 ................................................................................. 35 硬件焊接與調(diào)試 ................................................................................... 35 軟件調(diào)試 ............................................................................................... 36 系統(tǒng)調(diào)試 ............................................................................................... 38 小結(jié) ...................................................................................................... 39 參考文獻 ................................................................