Remote anti-theft alarm system based on telephone line

Posted on

With the development of society, broadband and mobile phones are becoming more and more popular, and the coverage of telephone networks is becoming wider and wider. Now we introduce a system that uses telephone lines for remote control and burglar alarm. The system uses single-chip control technology to MCS51 microcontroller. ISD4004 recording and playback integrated circuit, 128×64 LCD module, DTMF (dual-tone multi-frequency) processing integrated circuit, line detection circuit, etc. are organically combined, which is an advanced, practical and low-cost remote control system; The fixed telephone line completes the functions of remote control of the household electrical equipment and arming, disarming and remote alarming of the anti-theft system. The general block diagram of the work is shown in Figure 1. The block diagram of the remote control and alarm system is shown in Figure 2.

Figure 1 System block diagram

Figure 1 System block diagram

Figure 2 Block diagram of the remote control and alarm system

Figure 2 Block diagram of the remote control and alarm system

If there is a dial-in call, the line input circuit is assigned to enter the telephone line state detection (including the number of ringing pulses, whether it has been off-hook, etc.) and the DTMF decoding user obtains the incoming call signal data and the user button data, and the other way Then enter the voice processing circuit for analog signal processing. The DTMF signal and line information are photoelectrically isolated and input to the user interface board with STC89C58DR+ as the core. The user board determines whether to go off-hook and confirms the identity of the remote user. If the identity is confirmed successfully, the corresponding prompt tone is played and the user is waiting for the remote. Command to control household appliances.

In addition to the power supply, the DTMF decoder board cannot use the switching power supply because of the requirements of the telephone line. The other part of the power supply uses the LM2576-5.0 DC-DC converter chip to improve the power utilization.

In the alarm aspect, first set the alarm call by remote arming, and provide an active low-level alarm input port. All alarm sensors are input through a certain circuit. After the trigger, the alarm call is automatically set. The phone cancels the alarm (press the # key). If it is not released, dial the alarm call again after a certain interval.

Weiku PDF download: burglar alarm system production.rar

references:

[1]. ISD4004 datasheet http://

1 time
Window._bd_share_config = { "common": { "bdSnsKey": {}, "bdText": "", "bdMini": "2", "bdMiniList": false, "bdPic": "", "bdStyle": " 0", "bdSize": "24" }, "share": {}, "image": { "viewList": ["qzone", "tsina", "tqq", "renren", "weixin"], "viewText": "Share to:", "viewSize": "16" }, "selectShare": { "bdContainerClass": null, "bdSelectMiniList": ["qzone", "tsina", "tqq", "renren" , "weixin"] } }; with (document) 0[(getElementsByTagName('head')[0] || body).appendChild(createElement('script')).src = 'http://bdimg.share. Baidu.com/static/api/js/share.js?v=89860593.js?cdnversion=' + ~(-new Date() / 36e5)];

Glass Mosaic Pieces

C&K MOSAIC , https://www.cnkmosaics.com