Smart Fingerprint Password Lock Design Solution Based On The STM32 Single -Chip Microcomputer: The Perfect Combination Of Fingerprint Recognition And Access Control Lock Control

1. System hardware design

1. Microcontroller: This system uses STM32 single -chip microcomputer as the core controller.The STM32 series single -chip microcomputer has rich peripherals and powerful processing capabilities, which is very suitable for the control of complex systems.
2. Clock circuit: The clock circuit is used to generate the clock signal required by the system and provides the time benchmark for the entire system.
3. Reset circuit: The reset circuit can restore the system to the normal state through the reset operation when the system fails or abnormal.The reset circuit in this design has two ways: power -on self -reset and manual reset.
4. Display module: Use LCD12864 LCD display. It has high resolution and good display effects, which can clearly display the status information and operating menu of the system.
5. Fingerprint recognition module: Use AS608 serial port fingerprint module for fingerprint recognition.This module has the characteristics of high precision and high reliability, which can quickly and accurately identify fingerprint information.
6. Electromagnetic lock control circuit: The switch of the electromagnetic lock is controlled by the relay, and when the power supply is turned on, the control signal of the microcontroller is controlled to control the opening and turning of the electromagnetic lock.
7. The bee tweee prompt circuit: When the user enters the password or fingerprint error, the bee tweee will emit a prompt sound so that the user can know whether the operation is correct.
8. Matrix keyboard circuit: Use a thin -film matrix keyboard as the input device of the system. Users can enter a password or perform other operations through the keyboard.
9. LED indicator light circuit: The LED indicator in the system can display the state of the system, such as power supply, electromagnetic lock status, etc.
10. Power supply circuit: Provide a stable power supply for the entire system to ensure the normal work of each part of the circuit.

Second, system function detailed explanation

1. Password settings and modification: The user can enter the settings interface by pressing the settings key, and then enter the pre -set password (this password will not be lost after power off).Users can also modify the password at any time to protect the security of the system.
2. Fingerprint entry and recognition: Users can enter their own fingerprints, and the system will store the user's fingerprint information.In the subsequent use, when the user puts his finger on the fingerprint recognition module, the system detects and compares fingerprints.If the matching is successful, the electromagnetic lock will be opened; otherwise, the system will indicate that the user will not detect the corresponding fingerprint.
3. Password error processing: If the user enters the wrong password or fingerprint twice in a row, the system will automatically lock, and the LCD display will prompt the password to enter an error twice, and the system has been locked.At this point, the user needs to wait for one minute to try the operation again.During this period, users can change the password or re -enter the fingerprint.
4. Administrator function: The system has the administrator password, and users with the authority authority can open the electromagnetic lock by entering the administrator password. Regardless of whether the password or fingerprint set up earlier matches.This can facilitate administrators to operate under special circumstances.
5. Anti -intuitive interface display: Through the LCD display, users can intuitively see the status information and operation menu of the system.When the electromagnetic lock is turned on or closed, the LCD display shows the corresponding display of the electromagnetic lock or the electromagnetic lock is closed.

6. Efficient matrix keyboard: The matrix keyboard provides users with a convenient and intuitive password input method.Users do not need to worry about welding keyboards difficult to distinguish keys, because this design uses a high -definition matrix keyboard.