基于單片機(jī)的電話自動撥號報警器(已修改)
2025-06-18 22:37 本頁面
【正文】 畢 業(yè) 論 文（設(shè) 計） 屆 專業(yè) 班級題 目 基于單片機(jī)的自動撥號報警器的設(shè)計二О 年 月 日 內(nèi) 容 摘 要隨著社會的發(fā)展，人們的活動、居住區(qū)域越來越大，安全問題越顯重要。簡潔、經(jīng)濟(jì)型報警器成為家庭所需。本設(shè)計就是以AT89C51單片機(jī)作為電話自動撥號報警器的控制核心。首先，通過報警檢測電路中二氧化碳傳感器檢測空氣中的二氧化碳濃度來確定是否發(fā)生火災(zāi)，若二氧化碳濃度超過預(yù)先設(shè)定的濃度基準(zhǔn)值就產(chǎn)生一個報警信號，單片機(jī)檢測到該報警信號后，立即控制摘機(jī)電路摘機(jī)并從E2PROM存儲器CAT24C021中取出預(yù)先存儲的電話號碼，再通過雙音多頻發(fā)送電路編碼產(chǎn)生雙音頻信號，完成自動撥號功能。 本系統(tǒng)采用HD7279控制鍵盤及數(shù)碼管顯示，完成電話號碼的輸入和顯示功能，還采用了雙音多頻收發(fā)芯片MT8880來進(jìn)行編碼產(chǎn)生雙音頻信號，再通過音頻放大器LM386 來完成雙音頻信號的功率和幅度的放大。本設(shè)計涉及到了單片機(jī)開發(fā)、程序設(shè)計、傳感器設(shè)計及應(yīng)用、現(xiàn)代通信技術(shù)、自動控制技術(shù)等等，并將它們有機(jī)地結(jié)合在一起。這對于交叉學(xué)科的研究將起到很大的作用。關(guān)鍵： AT89C51 自動撥號 報警 DTMFAbstractAlong with the development of the society,people39。s activity and the district for living became more and more big,so the problem of safe also became more and more important . The alarm device which is simple and economic became needed for the family.In this design,AT89C51 microprocesser is adopted as the control unit,the smoke sensor is used to tell whether fire happens according to the detected smoke this density extend the one which is set in advance, the product will produce a alarm the alarm signal is sent to the microprocesser, the microprocesser will control the circuit to take off the telephone,and access the telephone number which is memoried in the CAT24C021 in advance.,then control the circuit of DTMF to dial the telephone ,the function of autodial is then finishend.This alarm device concludes a chip of HD7279 for entering ang displaying the telephone number,and a chip of MT8880 which is adoped as dialling and receiving the signal of DTMF,then via the audio power amplifier for enlarging the signal power.A spread field of science and technology such as SCM exploitation,programming,the design and apply of sensors,modern municate technology and control technology are involved in this research,ang are bined together organically. This will rise very important function for the study of cross.Key word： AT89C51 AutoDial Alarm DTMF目 錄第1章 前言 1第2章 電話自動撥號報警器的總體設(shè)計 2 2 電話自動撥號的主電路圖 3第3章 各功能模塊設(shè)計 5 5 模擬摘掛機(jī)電路模塊 6 顯示、鍵盤模塊 7 DTMF收發(fā)模塊 8 電話號碼存儲模塊 12 報警信號輸入 13第4章 電話自動撥號報警器的軟件設(shè)計 154．1 系統(tǒng)軟件設(shè)計 15 主程序的設(shè)計 16第5 章 結(jié)束語 22致 謝 23參考文獻(xiàn) 23 基于單片機(jī)的自動撥號報警器的設(shè)計學(xué)號：
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