"Electronic code lock is an electronic product that controls the operation of circuit or chip through password input, so as to control the closure of mechanical switch and complete the tasks of unlocking and locking. It has many kinds, including simple circuit products and chip based products with high cost performance. The widely used electronic code lock takes the chip as the core and is realized by programming.
1. Electronic code lock based on stm32f407
Functional overview
This design is mainly based on stm32f407 as the main control chip. An electronic code lock based on STM32 is composed of a 3.2-inch LCD screen, a relay and an electromagnet lock. The design can be used after power on. After power on, you need to click the screen 4 times to calibrate the screen coordinates. The screen calibration is successful, and the Blue English word adjust success will be displayed on the screen. Then the screen will appear similar to the dial-up keyboard in the mobile phone. This design supports the function of entering and modifying the password. The default unlocking password is "123456". To use the password modification function, you need to enter the administrator password "0000" first. The administrator password cannot be modified in the electronic lock. If it needs to be modified, the program needs to be rewritten.
Scheme link: https://www.cirmall.com/circuit/16338
2. Design scheme of fingerprint cipher lock based on single chip microcomputer
The scheme design is a design of fingerprint password lock system based on 51 single chip microcomputer. It can realize the function of successful fingerprint identification and unlocking. The fingerprint identification is successful, the indicator light is on, the relay acts to unlock, and the personnel can enter; The fingerprint identification is unsuccessful, the indicator light is not on, the relay does not act, and the personnel cannot enter. In the administrator mode, the functions of fingerprint entry, fingerprint deletion, emergency unlocking and password modification can also be realized. Deleting the fingerprint can delete the fingerprint with the specified fingerprint number, and the relevant operation steps can be displayed with LCD12864 LCD. When inputting and identifying fingerprints, the LCD12864 LCD will display the corresponding fingerprint number and relevant prompt information.
1. The basic functions of the system are required to be able to input, identify and delete fingerprints, input and identify up to 1000 fingerprints, and successfully unlock fingerprints. It is also equipped with a 4 * 4 key keyboard to realize password entry, modification and special functions.
2. Select STC89C52 single chip microcomputer according to functional requirements and cost performance.
3. Reasonably select components and complete the design of function key keyboard module, clock module, fingerprint identification module and LCD12864 display circuit.
4. Design the hardware circuit schematic diagram. Build the hardware circuit, write the program and debug the system.
Scheme link: https://www.cirmall.com/circuit/15839
3. Design of digital code lock based on 51 single chip microcomputer
Digital code lock is a revolution in the lock industry in the 21st century. The lock is characterized by no key, no lock hole, mechanical transmission, not easy to be damaged, not worn, not easy to be decoded, multiple password changes, no lock change, multiple passwords for one lock, and has the functions of anti dialing, anti smashing, anti prying, anti blocking, etc. When installing the door lock, do not damage the structure of the original door, and avoid all the troubles of opening the rotary core lock with the key (such as losing, falling, dismantling, blocking the door, being locked, etc.)“ "Digital code lock" is a lock opened by digital code. Its repetition probability is only one in 100000, which has high security; The use of rotary core lock is not safe enough. Through the survey of more than 1000 people from all walks of life, 100% of them have nothing to do with the string of keys hanging on their bodies. But now there is no lock that can get rid of the shackles of the key. They are willing to go in and out of the house easily without any concerns, and are willing to use a lock that is safe and convenient without keys. Therefore, the market development prospect of "digital password lock" products is very broad. Among the more than 1000 people surveyed, 60% had the experience of losing their keys, 25% had their keys locked indoors, 75% had their bedrooms on more than three floors, 36% left their keys in the factory, 8% jumped into their homes by using their neighbors' balconies and windows to open the locked doors, and 90% heard or read the news that they were unable to open the doors, The risk of jumping window accident is not death or injury, causing trouble to the family. The mental and physical damage is irreparable. In order to solve the various troubles brought by the above data, the "digital password lock" enables people to live in a carefree environment.
Scheme link: https://www.cirmall.com/circuit/14086
4. Design scheme of fingerprint identification password lock based on single chip microcomputer
Password lock based on 51 single chip microcomputer, fingerprint identification access control system, fingerprint password lock system, password lock based on 51 single chip microcomputer, fingerprint identification access control system, fingerprint password lock system, function: it can display time, query access records, open fingerprint lock Emergency unlocking (you can enter the administrator mode for emergency unlocking when the fingerprint unlocking is not easy to use or in an emergency). In the administrator mode, you can enter the fingerprint, delete the specified fingerprint, change the password and other functions. If the fingerprint is not identified successfully, the screen prompts that the relay does not act, the LED light does not light, the lock cannot be unlocked, and the buzzer gives an alarm, and the personnel cannot enter. Press any key to return to the initial interface to continue scanning the fingerprint. If the fingerprint is successfully identified, the screen prompt information is shown in the figure below. The relay acts, the LED is on and the door is unlocked. Personnel can enter, press any key to return to the initial interface and wait for the next person to scan the fingerprint.
Scheme link: https://www.cirmall.com/circuit/16360
5. Electronic code lock based on 51 single chip microcomputer (graduation design)
Function description of electronic code lock:
Suitable for graduation design, based on the 51 core development version of the electronic password lock main control board, you can power down storage, modify the password, give an alarm three times when the password is wrong, lock the keyboard, have the function of doorbell, etc
Connect a low-level drive relay at port P2 ^ 0 (Taobao price is about 5 yuan), and the relay is connected with an electric control lock (Taobao price is about 18 yuan)
If the final connection is not clear or the process is not understood, we will help in the whole process
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Partial source code
/*Module name: main function*/
/*Module function: program entry*/
//************************************************************************************************************************************
Void main (void) / / main function
{
// AT24C04_ WritePage(); // Password initialization (only need to write the initial password once)
System_ init(); // System initialization
while(1)
{
If (keyboard = = 0) / / if the password is wrong three times, lock the keyboard
{
KeyDown(); // Key detection
}
keysend(); // Data transmission
lcdxianshi(); // Input display
sure(); // Password authentication
condition_ delete(); // Key clear
new_ password(); // Password modification
Add_ Function(); // Attached function
}
}
Attachments include:
The whole circuit design schematic diagram and PCB source file are opened with AD software;
C language source program (with detailed Chinese Notes);
Proteus circuit simulation;
Scheme link: https://www.cirmall.com/circuit/1611
6. 51 single chip microcomputer simple password lock (160.2 display Chinese characters)
A single chip microcomputer control scheme based on STC89C51 is adopted.
Single chip microcomputer STC89C51 is selected as the core component of this design. The basic password lock function is realized by using the flexible programming design of single chip microcomputer, rich IO ports and the accuracy of its control. In the peripheral circuit of the single chip microcomputer, the external input keyboard is used for password input and some function control, and the external LCD1602 display is used for display.
3、 Key circuits, algorithms and programming, 2-3 pages
Write down the model of key components, key circuit design, program flow chart, etc.
Components: 1) copper clad laminate (j2601a)
2) 17 small keys (h0203g)
3) 1602 LCD (j0802a)
4) 16p pin (h0204e)
5) 16p single row female seat (h0204e)
6) Photoresistor (h0203k)
7) 104 adjustable resistance (h0205h)
8) 2.2k resistance * 2 (h0201d)
9) 1K resistance (h0201e)
10) 10K resistance * 4 (h0201c)
11) 1.5k resistance (h0201e)
12) 103 discharge resistance (h0202i)
13) 9012 * 2 triode (h0203b)
14) 9013 triode (h0202j)
15) 3P terminal block (h0205m)
16) 5V active buzzer (h0203i)
17) 40 pin IC base (h0202a)
18) STC89C51 single chip microcomputer
19) 10uF capacitance (h0203h)
20) 30pf capacitor * 2 (h0203c)
21) self locking switch (h0203f)
22) 8-pin IC base (h0202h)
23) 24C02 chip (h0113d)
24) 12m crystal oscillator (h0203d)
25) led (5mm red) (h0202n)
26) 5V Songle relay (h0205k)
27) DC power socket (h0211d)
28) several conductors (under the table)
29) number of soldering tin (under the table)
30) USB power cable
Test results:
1. Press the key to set the 6-digit password. Enter the password. If the password is correct, the lock will be opened. Show open!
2. The password can be changed by yourself (6-digit password). It can only be changed when the lock is opened. To prevent misoperation, change the password twice.
3. If the number of password input errors exceeds 3 times, the buzzer will alarm and lock the keyboard.
4.24c02 has the functions of reset, power down and password saving.
5. The LCD brightness will be automatically adjusted with the light.
6. The LCD screen displays the words "blue power brigade"
7. When it is used for the first time, enter 201901 to initialize the password. When: initpassword is displayed, it proves that the password initialization is completed. At this time, the password is 000000. Then you can change the secret.
Press * Key or reset key to close the lock and exit. When the input password is wrong, alarm and lock the keyboard for 3 seconds. Change Password: in the unlocking state, enter the correct password again and press # Key, you will hear two prompts, enter a new six digit password and press D Key, enter the new password again and press D ， Two prompt tones will be heard, indicating that the password is reset successfully, and the new password will be saved and stored internally. If the new password entered twice is different, resetting the password fails.
Scheme link: https://www.cirmall.com/circuit/11350
7. Electronic code lock based on single chip microcomputer
Double click to open the programs software, then double-click the AT89C52 single chip microcomputer, select the file with suffix. Hex we compiled in the program file option, and click OK (I have associated it, so this step can be done without doing it. If the program is recompiled, this step should be done).
Click the start button in the lower left corner and enter the wrong password for 3 times. If the number of digits is wrong, the system will be locked. Then press the reset button to re-enter the correct password, and the relay will be closed and disconnected after 3 seconds. At this time, press the enter new password, enter the 6-digit new password, and then press the confirm button of the new password, and the screen will show that the new password is saved, After that, enter the new password again and press the OK key. The screen shows that the password is correct.
The above is the recommended process. When the password is wrong, when the system is locked, when the password is reset, when the password is correct, and when the password is changed, the password can be powered off and saved, or the sequence can be arranged according to needs.
Note: 1. When changing the password, ensure that the password is 6 digits
2. After the password is correct, please wait 3 seconds before other operations (such as changing the password)
3. After the new password is saved, press reset or close the software and then open the software. The new password is still valid
Scheme link: https://www.cirmall.com/circuit/7932
8. Design of password lock based on 51 single chip microcomputer
instructions:
1. Press the "reset password" button to reset the password, which is six digits.
2. Press the "clear" key to delete the previously entered number.
3. The set distance is saved in the EEPROM of the single chip microcomputer and has the function of power down saving.
4. When the password is entered incorrectly, the buzzer will alarm.
5. The initial password is "111111".
Attachments include:
The circuit design schematic diagram of the whole password lock system is opened with AD software;
Hardware circuit, analog circuit, opened with Proteus;
Source code, annotated in Chinese;
Code lock material list;
Scheme link: https://www.cirmall.com/circuit/1102
9. Graduation design of electronic code lock based on STC single chip microcomputer
The design is based on STC single chip microcomputer. The circuit is mainly composed of 51 single chip microcomputer minimum system and key part, buzzer alarm part, LCD display part and so on. The circuit design is simple. It can be completed with a single-layer board and several jumpers. It is suitable for DIY production for electronic beginners.
Specific functions of electronic code lock:
1. The default password of the electronic code lock is 1234567890. The password is entered through the keyboard. If the password is correct, the lock will be opened.
2. The password can be modified and set by the user (only 6-digit password is supported). The password can be modified only after the lock is opened. Before changing the password, you must enter the password again. When entering the new password, you need to confirm it again to prevent misoperation.
3. Alarm and locking keyboard functions. Password input
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