Design of Home Fire Alarm Control System Based on Single Chip Microcomputer

With the rapid development of network communication technology and the gradual improvement of people's living standards, people's requirements for the safety and intelligence of housing are also increasing. The traditional fire alarm system has the problem that the line is cut off and the line is maliciously occupied, and it requires high energy, the system stability is poor, and accurate monitoring cannot be achieved. To this end, the home fire prevention and anti-theft control system of the single-chip microcomputer is designed to accurately monitor the safety of the family home.

The overall structure of the home fire alarm control system of the single chip microcomputer is described in FIG. The key control component of the home fire prevention and control system is the STC89C52 single-chip microcomputer, which includes the MCU main control module and each function sub-module. The SUM300 module is used as the wireless communication module, and the peripheral circuit adopts the JB35G short message module. The system feeds back the SMS alarm signal to the JB35G module. The MCU uses the RS232 serial port to exchange information with the JB35G module. Information such as indoor infrared signals and fire smoke concentration are detected by temperature and humidity measurement, wireless fire prevention, and anti-theft sensors. The MCU communicates with the communication protocol based on the GSM short message module to complete the transmission and reception of short messages. The main control single-chip circuit collects and parses short message instructions and controls different function sub-modules. The main control single-chip microcomputer manages the indoor power socket switch and the window light switch to detect the indoor temperature, humidity and smoke status, and alarms through short messages when there is an abnormality.

Figure 1 Overall structure of the system

The control system is in the disarmed mode under normal conditions. When the user is not at home, the control system is set to the arming mode, and the signal is detected by the wireless pyroelectric infrared detector, the flammable gas detector, the temperature and humidity sensor, and if there is any intrusion or fire in the warning area, the fire burglar alarm detector wireless transmitting circuit The signal will be transmitted, and the wireless receiving module collects the wireless signal and transmits an interrupt request to the microcontroller. After the MCU responds to the interrupt, it collects the encoder code corresponding to the alarm signal, detects the abnormal sensor, implements the sound and light alarm, and sends the alarm message to the user.

The system adopts the JB35G short message module, as shown in Fig. 2, which is a GSM short message module, which is small in size and widely used in remotely monitored mobile data communication systems. JB35G short message module provides complete circuit for GSM short message module, integrates SIM300 chip and its peripheral circuit, antenna and RS232 interface and other devices, and includes TCP/IP protocol, can complete TCP, UDP transfer, can use serial port in PC Realize the communication specification analysis and modulation of short messages.

Figure 2 JB35G short message module

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