Abstract: A car wireless anti-theft alarm device based on SIM300 is proposed. The program is mainly composed of two parts: single chip microcomputer and SIM300 module. With the help of a mature GSM mobile network, wireless control is carried out in the form of intuitive Chinese short messages or telephones, and the control and monitoring are intelligent, convenient and remote.

With the continuous expansion of the monitoring scope, the traditional wired monitoring alarm can no longer meet the needs of users. However, with the development of the GSM network, the hardware implementation of the remote network monitoring and alarm system has become possible, and it is expected to replace the traditional monitoring and alarm system controlled only by a single machine. This article designs a set of remote wireless alarm monitoring system based on GSM network according to the current demand. The basic idea is: connect the MCU and SIM300 communication module through the serial port to realize the communication between the MCU and SIM300.

The SIM300 module is equipped with a SIM card slot, which can realize the function of communicating with various users. The system is connected with vibration, infrared, sound and other types of sensors. When an alarm occurs in the car, the sensor transmits the alarm signal to the single-chip microcomputer. After the single-chip microcomputer judges and processes, it sends an alarm message to the user or directly calls the alarm phone. If the situation is urgent, the user can directly send a short message password, and the single-chip microcomputer controls the relay to cut off the line or the oil path to stop the car, thereby realizing remote control and effectively ensuring the safety of the car.

1 Hardware circuit design

The hardware part of this design includes the single-chip microcomputer main control module, LCD display, key circuit, power supply circuit, signal acquisition circuit and control circuit. The block diagram of the system structure is shown in Figure 1.

Figure 1 System structure block diagram

1.1 SCM control circuit

The system uses STC89C52 single chip microcomputer, STC89C52 is a low power consumption, high performance CMOS 8 bit microcontroller, with 8 KB system programmable flash memory. This type of single chip microcomputer has a high cost performance and is widely used in various fields such as industrial control, instrumentation, communication equipment, household appliances and so on.

1.2 GSM module circuit

This system uses the SIM300 module. Among them, the 16 pins of SIM300 are connected to the network indicator (LED) to indicate the strength of the SIM300 signal. The 17 pins are connected to the P3.3 of the single-chip microcomputer. The signal makes the module in working state, 43, 41, 49 are serial communication interfaces, which are connected with P3.0, P3.1, P3.2 of the single chip microcomputer, respectively. Pins 1, 3, 5, 7, 9 are connected to 4.2 V power supply. SIM300 and single chip are connected through serial port. The single chip control system can send AT command to SIM300 module to control its working status.

1.3 Keyboard, display and external storage circuit

The system uses a 4-row, 3-column matrix keyboard, where the row line is connected to P1.0 ~ P1.3, the column line is connected to P1.4 ~ P1.6, and the column line is connected to a +5 V power supply via a 10 kΩ resistor. There are 12 keys in total, which are set to 0 ~ 9, *, # and other key numbers.

This system adopts LCD12864 liquid crystal display module. The display module can display 4 lines of Chinese or characters per screen. It is used to display prompt information and mobile phone number.

This system requires that the user preset mobile phone number is stored during use, so an external memory is required. Use AT24C02 when the stored information is not large.

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