introduction:
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In today's society, the use of cars, especially private cars, has become very popular. Car access control systems play a vital role in protecting the safety of car personal property, displaying user personality and ownership. Today, the RF RKE access control system introduced by the automotive industry greatly improves the convenience of the owner to open the door, even in the dark or cold weather conditions, the user can easily open the door.
But on the other hand, the RF RKE access control system also has great shortcomings. In the absence of the original key or PEG key card, the owner will face a dilemma. If the PEG key card is lost, the owner's property security is even more threatening.
In this realistic context, this solution attempts to implement a new way of access control system through a single-chip microcomputer to overcome the natural defects of the RF RKE access control system described above.
System Block Diagram:
The system framework is shown below:
1. GPRS wireless communication system module:
This module is based on the GPRS wireless packet communication service provided by the widely used wireless network service operators to complete the interactive communication service from the owner to the core of the single chip system.
On the one hand, accept the key sequence or instruction sequence sent from the owner's mobile phone, convert it into the serial data of the appropriate format, relax it to the core module of the MCU, and perform data processing by the MCU to complete the related actions such as driving the door and the door and the requirements of the owner. Other actions.
On the other hand, accept the status data from the core module of the MCU, convert it to the appropriate format and send it to the owner's mobile phone to provide the current running status of the car or the completion of the command for the owner to check.
2. Single chip core data processing module:
This module mainly performs the following functions:
A accepts status data sent back from the vehicle's operational status monitoring module, including the on or off status of the access control system, and the start or stop status of the vehicle.
B accepts the user key and command data forwarded from the GPRS communication module.
C processes the data, compares the sent key, if the key is correct, sends an open command to the car running control module; otherwise, sends a reject command to the braking module, stops the car, sends an alarm signal, and sends an emergency Status information to the original owner's phone.
D accepts the query command from the user and sends the car running status information to the user's mobile phone in the appropriate format.
E Features requested by other related users.
Due to the small amount of data processing required by this module, this function is implemented based on Fujitsu's latest MB95F 168, which is applied to automotive electronics.
3. Car running status monitoring module:
Based on the sensor implementation, the operating state data of the car is sent back to the single-chip microcomputer, including the open state of the car door access system and the running state of the car.
4. Vehicle operation and brake control module
Accept the commands from the core module of the MCU to implement related actions, turn on or brake the car, and issue an alarm in an abnormal state.
5. User mobile phone:
Acting as a user's operating platform, based on common GPRS services.
Software flow chart:
Application prospects and summary:
In summary, the car access control system described in this scenario has the following advantages:
1. Extremely high safety performance:
A In this solution, the user can easily turn on the car or lock the car through the mobile phone, and send the key through the user's personal mobile phone, which greatly improves the security, and can effectively avoid the inconvenience and property caused by the theft of the key or the key. The security threat effectively overcomes the shortcomings of the original mechanical door lock and RF RKE access control system.
B In this scenario, when a criminal attempts to destroy or steal a car, the access control system will not only issue an on-site alarm like most alarm systems, but also automatically send emergency information to the owner's mobile phone, allowing the user to take precautions. C In this program, the user can check the running status of the car at any time through the mobile phone, and can issue commands at any time. When the accident is stolen, the car can be locked and locked at any time, so that the criminals can't succeed.
2. Very low implementation cost:
As mentioned above, the core of this solution is implemented by Fujitsu 8-bit single-chip microcomputer, which has low cost, strong performance and simple implementation.
3. A wide range of applications:
This solution can be limited not only to the access control system of automobiles, but also to the application of anti-theft and access control systems for various mobile or fixed property.
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