Circuit design of automobile fingerprint alarm system using GSM wireless communication network

Fingerprint identification is a type of biometric identification. It uses the uniqueness and lifelong immutability of fingerprint characteristics to authenticate personal identity, and is extremely safe and easy to use. The global mobile communication system GSM has the advantages of wide coverage, low cost, no noise pollution, and no restrictions on regions and lines. It uses the GSM network as a wireless transmission network to send car alarm information to car owners in the form of short messages, which can It overcomes the shortcomings of the above three types of alarms and solves the communication problem between the car anti-theft system and the car owner, thereby achieving the purpose of alarming.

The software design of the alarm communication module is to realize the microcontroller to control the TC35i module to send alarm short messages, that is, to write different AT commands to the TC35i module through the serial port of the microcontroller, thereby realizing the function of sending alarm short messages. The AT command is the underlying command of the GSM module and is used to control the GSM module for wireless communication. The GSM AT command set was jointly developed for the GSM system by Nokia, Ericsson, Motorola, HP and other manufacturers, which includes the control of short messages.

Figure 2 Peripheral hardware circuit diagram of TC35i module