Design of Fingerprint Unlocking System Based on STM32 Microcontrollere

This paper mainly introduces the main design contents of fingerprint unlock system including: core control chip, fingerprint recognition module, OLED display and sound and key system. According to the data provided by the fingerprint identification module, its main communication mode is serial communication. According to the data of the module, the serial port assistant simulates the module instruction to establish preliminary communication, and then the microcontroller program is written to send the module instruction through the serial port to constitute the communication between the microcontroller and the fingerprint module. After debugging, it can add fingerprint, unlock fingerprint, delete fingerprint and other functions, mainly used in access control system, fingerprint lock, attendance machine and other applications. The fingerprint module is mainly based on the principle of optical induction, and its advantages of high accuracy and stability as well as low cost are widely used.