Access control system based on RFID

be based on RFID Design and implementation of access control system based on

Be free and at leisure , On hand STM32 Make a project .

Finished product function ： Functional specifications

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material

• STM32ZET6 Development board
• TFT display ( The warship is for me 2.7 " )
• RC522（RFID）
• RFID card
• Five phase four wire progressive motor
• ULN2003（ Drive the stepper motor ）
• DuPont line
• use keil5 Development

Start making .

The production process

Start the stepping motor to open and close the door by swiping the card . The screen displays specific information .

explain
Start ： First test RC522 After the data can be read , Then connect the stepping motor , Adjust to the angle of adaptation .

RC522（RFID） modular

This is a RC522RFID modular

This is a recognizable card .

We connect the module to the board , Then go to the identification card .
Four groups of hexadecimal numbers are recognized .

You can see , This is what is recognized ID Card number . We save this card number in the code .

Stepping motor and drive ULN2003

explain ：
The drive module must be used to drive the stepping motor , Otherwise, the voltage of the board is not enough to drive the motor .

Stepper motor related

1、 Step angle ：5.625 / 64 = 0.087 degree . That is, in theory , Give a pulse , The outer shaft of the motor only rotates 0.087 degree , Then if the outer shaft needs to rotate for one turn 360/0.087=4096 Pulse .
2、1 Phase excitation method ： Only one coil is connected in every moment , Other rest . advantage ： Simple , Low power consumption , Good accuracy . shortcoming ： Small torque , It vibrates a lot , The angle of each excitation signal is the nominal angle .1 Phase excitation method ：A->B->C->D.
3、2 Phase excitation method ： At every moment, two coils are connected . advantage ： High torque , Little vibration . shortcoming ： Small torque , It vibrates a lot , The angle of each excitation signal is the nominal angle .2 Phase excitation method ：AB->BC->CD->DA.
4、1-2 Phase excitation method ：1 Phase and 2 Alternate conduction . advantage ： High precision , Smooth operation , Every time an excitation signal is sent, rotate 1/2 Nominal angle , Called half step drive . The first two are called 4 phase 4 pat , This one is called 4 phase 8 pat .1-2 Phase excitation method ：A–>AB–>B->BC->C–>CD->D–>DA.
5、 Turn counterclockwise in the opposite direction .

Connect the stepping motor , Adjust the angle for comprehensive test

Um. . The effect is very good . You can see , The stored card can open the access control . Unsaved cards cannot be opened .
In the follow-up, you can also do the upper computer , reference https://blog.csdn.net/weixin_42320020/article/details/89219437

Finally, a complete project document is attached . download .

The project is finished here .
There are many deficiencies , I hope you can correct . Also hope to communicate and learn with lovers .

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