the remote intellectual pronunciation anti-theft alarm system design of the one-chip computer

Precautions must be taken against low safety coefficients, as the applicable space for security measures continues to shrink. With advancements in science and technology, innovations such as magnetic door sensors, touch-type systems, radar monitoring, and infrared detection have emerged, leading to a series of alerting mechanisms. These automatic alarm systems exhibit high levels of automation and adaptability, demonstrating a degree of intelligence. However, there are instances where these systems fail to notify victims of a crime in a timely manner. To address this issue, a remote intelligent pronunciation burglar alarm system based on the AT89C52 microcontroller has been designed. This system is capable of detecting intrusions and can alert the victim through a standard telephone line, ensuring timely notification. The system is characterized by high intelligence, practicality, and reliable performance.

The system comprises an AT89C52 microcontroller, a signal detection circuit, a reset circuit, a telephone number storage circuit, a ringing detection circuit, a simulated off-hook mechanism, and a dialing circuit with a speech output. The structured flowchart of the system is illustrated in Figure 1. The DTMF code transmitted via the telephone line is preset in the CPU, allowing for easy storage of the telephone number by the user. This number can be configured as needed, accommodating various types of telephone systems, including urban program-controlled phones and mobile phones. As depicted in Figure 2, when the signal detection circuit identifies an intrusion, it sends a triggering signal, which serves as the alarm signal. This signal is processed and amplified by the CPU, which then initiates a delay period. If the host is present, the reset circuit can be activated to initialize the system for a predetermined duration; otherwise, the system is programmed to contact law enforcement.

Initially, the CPU checks the output from the ringing current detection circuit. If a high level is detected, it indicates that the subscriber device is ringing, allowing for the off-hook dialing process to commence. A delay is implemented to manage the situation. If a low level is detected, the CPU instructs the simulated off-hook mechanism to dial the stored DTMF telephone number, establishing a connection with the designated recipient. Two scenarios may arise at this point: either the telephone is engaged or ringing. In the first scenario, the system continues to simulate the off-hook state while dialing, followed by a delay. In the case of ringing, once the off-hook state is achieved, the system begins transmitting the signal tone or speech signal, which is recorded and produced by the ISD1420, ultimately concluding the call.

As societal awareness of security continues to rise, the installation of burglary-resistant systems has become increasingly important for safeguarding personal and property safety in various locations, including homes, banks, and shops. Traditional security measures, such as mechanical burglar-resistant doors and theft-proof windows, have proven inadequate due to their low safety coefficients and limited applicability. The integration of advanced technologies has led to the development of more effective security solutions.Take precautions against the coefficient is low, the safety is bad, the applicable space is smaller and smaller. With the development of science and technology, people develop already the intersection of door and magnetic, touch-type, the intersection of radar and monitor, the intersection of infrared rays and the intersection of person who monitor and a series of alerting

automatic telling status, the automaticity of these alarm system is high, the suitability is strong, have intelligent the certain one. But when being Give the alarm can`t notify victim of a crime in time while being systematic mostly. The situation to this, this text has designed a kind of intellectual pronunciation burglar alarming system of remote based on AT89C52, system this find, can steal feeling call number in time, can pay alerting signal call out with Ordinary Telephone Line, notify the victim of a crime in time.

It is strong that this system has high, practicability of intelligent procedure, such characteristics as reliable performance is steady. This system is by AT89C52 one chip microcomputer, detection circuit of the signal, reset circuit, telephone number preserve the circuit, detection circuit of the ringing, Simulated Off-Hook and hang electromechanical No.

, dial-up circuit and speech circuit to make up, the systematic structured flowchart is shown as in Fig. 1. What DTMF code transmitting line is sent is to preset the telephone number in CPU easy to store by the incoming circuit of the telephone number by users, this number can be set up at will, it can be urban program-controlled telephone, mobile phone, etc.

The flow block diagram is shown as in Fig. 2, when the detection circuit of the signal measures someone to intrude upon, namely send out the triggering signal, this signal, as the alarm signal, through enlarging and sending CPU, CPU is after will certainly delay time ing, if the host enters, can utilize reset circuit to enable its initialisation for a fixed period of time, otherwise plan to call the police, CPU checks the output situation of the signal detection circuit of ringing current at first, export as one high level, prove the intersection of subscriber device and ringing, can offhooking dials, need to delay time to deal with, only when exporting as the low level, CPU instructs simulation to pluck the offhooking of electromechanical way, send DTMF telephone number, calls out and preserves the telephone receive side, two kinds of situations appear at this moment: The intersection of telephone receive and square engaged-line and the intersection of telephone receive and the intersection of side and ringing, appear the first one situation, go on, imitate on hook, the meeting at the airport dials and then delay time; If side`s ringing, offhooking of telephone receive, namely the Signal Tone or speech signal beginning to be sent and is recorded and produced in ISDl420, on hook finally. Modern social people`s security consciousness is higher and higher, the burglary-resisting installation of installation come to protect life and property safety in some importance places such as family, bank, shop, etc.

Er early safety and defense equipment is generally a mechanical type Such as the burglary-resisting door, theft-proof window, Take precautions against the coefficient is low, the safety is bad, the applicable space is smaller and smaller. With the development of science and technology, people develop already the intersection of door and magnetic, touch-type, the intersection of radar and monitor, the intersection of infrared rays and

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