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

　　Fingerprint recognition is a type of biometric recognition. It uses the uniqueness and lifelong immutability of fingerprint features to authenticate personal identity, and has extremely high security and ease of use. The global mobile communication system GSM has the advantages of wide coverage, low cost, no noise pollution, and no regional and line restrictions. Using the GSM network as a wireless transmission network to send car alarm information to the owner in the form of short messages can overcome the shortcomings of the above three types of alarms, solve the communication problem between the car anti-theft system and the owner, and thus achieve the purpose of alarming.

　　The software design of the alarm communication module is to realize the single-chip microcomputer to control the TC35i module to send alarm short messages, that is, to write different AT commands to the TC35i module through the single-chip microcomputer serial port, so as to realize the function of sending alarm short messages. AT commands are the bottom-level commands of the GSM module, which are used to control the GSM module for wireless communication. The GSM AT command set was jointly developed by Nokia, Ericsson, Motorola and HP for the GSM system, which includes the control of short messages.

　　Figure 2 TC35i module peripheral hardware circuit diagram