First, project overview
1.1 introduction
By the beginning of the 21st century, RFID ushered in a new development period, and its value in the world of civil society is widely concerned. RFID (Radio Frequency Identification), ie radio frequency identification. RFID RF recognition is a non-contact automatic identification technology that automatically identifies target objects and acquires data through RF signals, identifying do not need manual intervention, which can operate in various harsh environments. RFID technology recognizes high-speed sports objects and can simultaneously identify multiple targets, and make quick and easy.
1.2 Project Background / Punch Motivation
Mobile phones have become an indispensable part of people's lives. This happens to the case of mobile phones in life. Especially expensive mobile phones, it is a thief's goal. Theft of the mobile phone, bringing not only the payment of money, but also the loss of important information in the mobile phone. The anti-theft of the mobile phone slowly entered people's field of view. RFID technology can be good to realize the function of mobile phone anti-theft.
Second, demand analysis
2.1 functional requirements
This design mobile phone anti-theft completes the following tasks:
First: timely anti-theft
Second: mobile phone is stolen
Third: Prevent mobile phone remains
Figure 1 System architecture
2.2 Performance requirements
When the thief is waiting for an abnormal situation, when touching the phone, I will inform the master for the first time.
Determine the mobile phone to be stolen, provide information, fast positioning of the target mobile phone
The phone leaving a certain range, reminding the owner to drop the phone
Provide a sufficient useful information interface
Third, program design
3.1 System function implementation principle
Under normal conditions. There is a RFID label in the hand. When the legitimate rights touch the phone, you can use your phone normally. When the abnormal situation such as a thief is accessed, the surrounding temperature of the phone will change accordingly. The device on the mobile phone opponent is compared with the information comparison. When the confirmation is unusual, it is determined to have a risk of stolen, reminding the user to issue a prompt and alert.
Second: mobile phone is stolen
When the mobile phone is accidentally stolen from the head of the household, the handheld device responds to the user to remind the user. When the user determines that the phone is stolen, enter the RFID distance ranging mode. The mobile phone operator can return according to the mobile phone and the distance. This will be able to quickly locate the mobile phone, and the phone can be retrieved for the first time. When the direction of the owner is looking for and the mobile phone direction, the distance can be displayed. When the air owner is consistent with the direction of the phone, it is possible to display the distance, and it can guide the master's search.
Third: But set the human machine distance, which can give the mobile phone to the mobile phone, make a reminder, effectively prevent the main legacy of the mobile phone. Let the phone can get the best protection.
3.2 Hardware platform selection and resource configuration
The evaluation kit and development system EVK1100 based on the AVR32 AT32UC3A microcontroller controller are selected.
The AVR32 AT32UC3A has a single cycle of RISC instruction system to meet the needs of communication and data high speed processing.
It is convenient to expand and use external interfaces and external storage spaces to facilitate expansion and external storage spaces.
3.3 System Software Architecture
1. The program modularization of each module;
2. The main program determines whether the phone has an abnormal state;
3, abnormal state processing;
4, the setting of the safety distance;
5, temperature collection;
6, the setting of interfacial interface;
7. Consolidation of safety.
3.4 System Software Process
Program operation flow chart
3.4 System is expected to achieve results
The wireless RF transceiver and ranging module use Nanotron's Nanopan modules. This module uses a broadband linear FM spread (CSS) technology and is adopted for IEEE 802.15.4a. The transceiver is a 2.4 GHziSM band wireless device, which can flexibly provide data transfer rates of 31 25 kb / s ~ 2 Mb / s ranges. The point-to-point ranging accuracy is high, and reliable data with excellent transmission range can be provided. Communication. By adopting a MAC controller, the requirements for microprocessors and software can be reduced, and the design of the high-level system can be easily completed. This module is one of the important core parts. The focus of theft. Finally, the level of anti-theft levels are high.
Design works adds a simple interpersonal interaction interface.
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Source: Wiku Electronic Market Network
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