CN105512819A - Campus bicycle parking management system - Google Patents

Abstract

The present invention relates to a campus bicycle parking management system which is a system of bicycle safety parking and position recording so as to realize the automatic control of the management and locking and unlocking of campus bicycles and the rapid and efficient taking and placing of the bicycles. Through ID identification, people outside a campus can be limited from using the system, and through connecting the database of students and teachers, the school information is viewed. After the graduation or leaving of the students and teachers, ownerless bicycles are recycled and processed. By using fingerprint identification, the owner security permission can be protected and the bicycle safety is improved. Multifunctional unlock modes comprise the unlocking modes of grip strength, weight, musical rhythm, direction, fingerprint, password the like, campus bicycle borrowing service can be realized, and the life of the bicycles can be prolonged by reasonable management.

Description

Campus bicycle parking management system

technical field

The invention relates to a monitoring technology, in particular to a campus bicycle parking management system.

Background technique

Due to the current social status, the economic strength of college students and the increasing awareness of environmental protection, bicycles, a cheap and environmentally friendly means of transportation, have become the primary choice of college students. And because the university campus is open to the whole society, and there are abundant bicycle resources inside the campus, the campus has become a high-incidence area for bicycle theft. In particular, freshman enrollment is a high-incidence period for bicycle theft every year. During this period, students' demand for bicycles increases sharply. Coupled with the weak awareness of freshmen's prevention, it is easy for criminals to take advantage of loopholes.

Colleges and universities do not implement special management of bicycles, and in fact, the security offices of colleges and universities have very limited protection measures for bicycles. The bicycle parking spots on campus are not concentrated, and students park bicycles nearby for convenience, which makes it impossible for the relevant departments of the school to carry out effective management. centralized management. At the same time, because the public security department is not familiar with the situation in the school, and it is difficult to obtain evidence for such cases, it is also difficult for the public security department to crack down on it, so at most it is registered. The security department is familiar with the situation in the school but has no investigative power, and many things are more than enough, resulting in a management vacuum.

Existing bicycle locks are roughly divided into chain locks, flat common locks, U-shaped locks, idling locks and mechanical combination locks, and these bicycle locks all realize the anti-theft function of the car lock by mechanical means. But it is very easy to destroy the lock cylinder and corresponding parts by physical means, so that its anti-theft function is lost. So we design a novel anti-theft safety protection system with high anti-theft performance to solve the bicycle anti-theft problem.

Contents of the invention

The invention aims at the problem that bicycles are easy to be stolen, and proposes a campus bicycle parking management system, a system for safely parking bicycles and recording positions, so as to realize the management of campus bicycles, automatic control of locking and unlocking, and fast and efficient pick-and-place vehicle.

The technical solution of the present invention is: a campus bicycle parking management system, including a back-end computer and a front-end embedded processor, the computer and the school server database are connected and accessed through a network cable, wherein the embedded processor is installed on the front-end bicycle parking Platform, the embedded processor includes a variety of sensor modules, password modules and RFID radio frequency modules, a variety of sensor modules are used to quickly identify user identity features, and the embedded processor collects feature information or password information and sends it to the back-end computer for comparison. Yes, the user logs in and registers, encrypts and passwords through the back-end computer. The embedded processor downloads the storage information and location information of the bicycle from the school server database through the RFID radio frequency module computer for query. The embedded processor passes the RFID radio frequency After the module checks the information with the computer, the computer notifies the embedded processor on the bicycle parking platform through the school server database to release the bicycles that need to be picked up.

The encryption method is divided into three levels of security: low, medium and high.

The low-level security level includes two unlocking methods: grip unlocking and body weight unlocking; the intermediate security level includes two unlocking methods: rhythm unlocking and direction unlocking; the high-level security level includes two unlocking methods: radio frequency unlocking and fingerprint unlocking, choose one or both A combination of unlocking methods is used.

For the grip unlocking and body weight unlocking, a pressure sensor is added to the driving parking platform, and the output current value of the pressure sensor is converted to digital and then transmitted to the embedded processor. By comparing the measured value with the read value of the database, if the error is within Within 10%, it can be determined that it is the owner himself.

The rhythm is unlocked, and a sound sensor is added to the driving parking platform. The sensor uses LM358 as an audio power amplifier, and a capacitive electret microphone is built in the sensor. The external sound waves make the electret film in the microphone vibrate, resulting in capacitance Changes, resulting in corresponding voltage changes, the voltage is received by the data collector through A/D conversion, and sent to the embedded processor, by setting the threshold, the voltage value below the set value is represented as 0, and the voltage value greater than The voltage value of the set value is expressed as 1, which can identify and encode the strong and weak sounds, and the encoding is the encryption method to unlock and lock.

The direction unlocking is to install a four-way joystick on the bicycle parking platform. Each direction of the joystick corresponds to an I/O port of the embedded processor. By encoding the conduction states of the four I/O ports, when When one of the directions is turned on, record the code in this direction, and judge whether it can be unlocked by comparing the input password segment with the password segment in the database.

The beneficial effects of the present invention are: the campus bicycle parking management system of the present invention, through ID identification, can restrict people outside the school from being able to use the system; by connecting to the database of teachers and students, the school information can be checked. After teachers and students graduate or leave school, unowned vehicles can be recycled; using fingerprint recognition can guarantee the owner's security authority and increase bicycle safety; multi-functional unlocking methods: grip, weight, music rhythm, direction, fingerprint, password And other unlocking methods, and can realize the campus car rental service, reasonable management can prolong the service life of the bicycle.

Description of drawings

Fig. 1 is a functional schematic diagram of an embodiment of the present invention;

Fig. 2 is a diagram of the security level and unlocking mode of the embodiment of the present invention;

Fig. 3 is a flow chart of user use according to the embodiment of the present invention;

Fig. 4 is a flow chart of grip force and gravity unlocking according to the embodiment of the present invention;

Fig. 5 is the sound sensor circuit diagram of the embodiment of the present invention;

Fig. 6 is a schematic diagram of the sound unlocking coding of the embodiment of the present invention.

detailed description

As shown in Figure 1, the present invention is divided into two parts: the computer as the back end; the embedded processor as the front end. They communicate through UART serial port technology. At the same time, the computer and the school server database are connected and accessed through network cables.

The embedded processor is installed on the front-end bicycle parking platform, and the embedded processor includes a variety of sensor modules, which can quickly and effectively identify the user's identity. When the user uses the system for the first time, he needs to read the user information in the card through the RFID radio frequency module, and send the information to the back-end computer cluster through the USART serial port. Compare the user information to determine the effective identity of the user, such as determining whether the user is a student of the school. After judging that the user identity information is valid, the user can select one or more encryption methods and set the corresponding password through the embedded processor. After the setting is completed, the embedded processor sends the information to the back-end computer cluster through the USART serial port again. The computer uploads the password information set by the user to the database and saves it. When the user subsequently uses the system, he only needs to identify the user's valid identity through the card, select the unlocking method and enter the corresponding password, and the embedded processor can send the collected feature information or password information to the back-end computer for comparison. When the comparison is correct, the unlock command can be sent to complete the parking of the bicycle. At the same time, the user can also query the parking record and location of the bicycle through the campus network.

When the user uses the bicycle parking management system for the first time, he needs to log in on the computer at the parking place and register the use authority of the bicycle parking system. After successfully logging in to the system, you also need to set the security level of unlocking and the corresponding unlocking method, as shown in Figure 2. The security level is divided into three levels, low, medium and high, and each security level corresponds to a different unlocking method. The higher the security level, the more complicated the user identification process, the higher the identification accuracy rate, and the better the corresponding security.

After initially setting the security level and unlocking method, and collecting the corresponding characteristic information or unlocking password of the user, the user can use the system normally. The usage process is shown in Figure 3. At the same time, the user can also know the storage information and location information of the bicycle by accessing the corresponding bicycle status information in the database.

1. RFID radio frequency reads user information and logs into the system

The RFID radio frequency module adopts the Philips MFRC522 original chip to design the card reading circuit. The module uses a voltage of 3.3V, and communicates with the microcontroller through the SPI interface. MFRC522 RF card read-write module (hereinafter referred to as the read-write module) sends wireless carrier signals to the RF card (non-contact card) through the antenna. After these signals are coupled and received by the antenna of the RF card, they are first converted into waveforms, and then rectified and filtered. The voltage is further processed by the voltage regulation module, including voltage stabilization, etc., and finally output to all levels of circuits on the radio frequency card. At this time, after receiving the carrier signal, the contactless card will modulate/demodulate the carrier signal through the modulation/demodulation circuit on the card, and the processed signal will be sent to the controller on the card for control and processing. After the contactless card has processed the data, it also returns the carrier signal to MFRC522 through its own antenna, and MFRC522 also processes these signals through its own modulation/demodulation circuit. The frequency of these returned carrier signals is consistent with the frequency of the carrier signal sent by MFRC522. Through such a communication circuit, MFRC522 can read and write the content of the contactless card. What needs to be explained here is that the non-contact IC card itself is a passive body. When the reader reads and writes the card, the signal sent by the reading and writing module is composed of two parts: one is the power signal, and the signal is provided by the card. After receiving, it resonates with its own L/C, generating an instantaneous energy to supply the chip to work. The other part is to combine data signals to direct the chip to complete data, modify, store, etc., and return to the read-write module. The MCU first initializes the configuration of the MFRC522. After the registers are set, the MFRC522 can receive commands from the MCU to perform operations and communicate with the Mifare card. The Mifare card can perform corresponding operations according to the received instructions. However, the MCU cannot read and write IC cards through simple instructions, and requires a series of operations to complete the communication. Mainly include: (1) wake-up request; (2) anti-overlapping (to prevent data errors caused by overlapping of multiple cards); (3) card selection; (4) password authentication; (5) read and write operations. The series of operation procedures of LPC2132 on Mifare cards must be carried out in a fixed order. When a Mifare card enters the effective range of the RF antenna, the card reader program will start the above series of operations.

2. The two unlocking methods with low security level are grip unlocking and weight unlocking:

As shown in Figure 4, the grip unlocking is to add a grip device to the bicycle parking platform, and add a pressure sensor to the device. The working principle of the pressure sensor is: when the metal wire is subjected to external force, its length and cross-sectional area will change, and its resistance value will change. Applying the same voltage across the wire will result in different current values. Because each person's grip strength is different, it is easy to determine whether it is the owner of the car by measuring the different current values through the wire. After the sensor reads the current value, it performs digital-to-analog conversion and transmits the converted value to the embedded processor. By comparing the measured value with the read value in the database, if the error is within 10%, it can be determined that it is the owner of the car. . The principle of weight unlocking is similar. Using this method as an unlocking method is more convenient and quicker, but less secure.

3. The two unlocking methods with an intermediate security level are rhythm unlocking and direction unlocking

Cadence unlocking is adding a sound sensor to the bike parking platform. The sensor uses LM358 as an audio power amplifier, and a condenser electret microphone sensitive to sound is built in the sensor, the principle is shown in Figure 5. External sound waves vibrate the electret film in the microphone, resulting in a change in capacitance, which produces a correspondingly small voltage change. This voltage is accepted by the data collector through A/D conversion and sent to the embedded processor. By setting the threshold, the voltage value below a certain set value is expressed as 0, and the voltage value greater than the set value is expressed as 1, so that two kinds of strong and weak sounds can be identified and encoded. As shown in Figure 6, by playing different rhythm strengths, different binary codes can be corresponded to, and this code with different lengths can be used as an encryption method to unlock and lock, thereby converting the binary code segment For a certain rhythm, it is convenient for password memory to improve security.

Direction unlocking is to install a four-way joystick on the bicycle parking platform, and each direction of the joystick corresponds to an I/O port of the embedded system. Shake the joystick, that is, there are four directions, up, down, left, and right, and the four directions correspond to four I/O ports. By judging the conduction states of the four I/O ports, a new code can be formed. When one of the directions is turned on, the code of this direction is recorded. By comparing the input password segment with the password segment in the database, it can be judged whether it can be unlocked. You can set the four directions of up, down, left, and right to correspond to the four values of 1234, and you can form a quaternary password. This method converts the password segment into four directions of up, down, left, and right, making password memory easier.

4. The two unlocking methods with advanced security level are password unlocking and fingerprint unlocking

Fingerprint recognition is to install a fingerprint recognition module on the bicycle parking platform. When the user puts his finger on the collection window, the light emitted from the module will be refracted on the uneven lines on the surface of the finger and the light reflected back will be different. The optical device of CMOS or CCD will collect the image information of different light and dark degrees, and the collection of fingerprints will be completed. The microcontroller first initializes the STM32F429 configuration. After the registers are set, the fingerprint identification module can receive the MCU command to perform operations and realize the control of the collector. The collector can perform corresponding operations according to the received instructions. However, the MCU cannot collect and compare fingerprints through simple instructions, and requires a series of operations to complete the communication. It mainly includes: (1) judging whether the database is not full; (2) collecting fingerprints; (3) adding fingerprints to the database; (4) comparing fingerprints; (5) deleting fingerprints. When the user's fingerprint matches correctly, it can be unlocked.

Password unlocking, when the user selects this method as the unlocking method during the initial login, the user will be asked to enter the unlocking password. In the subsequent use, the password entered when unlocking will be matched with the password saved in the database, and if it is correct, it can be unlocked.

Claims (6)

1. a campus bicycle parking management system, it is characterized in that, comprise the computing machine of rear end and the flush bonding processor of front end, computing machine is undertaken being connected and accessing by netting twine with school server database, wherein flush bonding processor is installed on the bicycle parking platform of front end, flush bonding processor comprises multiple sensors module, crypto module and RFID radio-frequency module, multiple sensors module is used for identifying fast user identity feature, flush bonding processor acquisition characteristics information or encrypted message are sent to back-end computer and compare, user is registered by the computer log of rear end, cipher mode and password are arranged, the information of depositing of the bicycle that flush bonding processor is downloaded from school's server database by RFID radio-frequency module computing machine and positional information, for inquiry, flush bonding processor is by after RFID radio-frequency module and computing machine cross-check information, computing machine needs the bicycle picked and placeed by the flush bonding processor release on school's server database notice bicycle parking platform.

2. campus bicycle parking management system according to claim 1, is characterized in that, described cipher mode be divided into low, neutralize high three level security grades.

3. campus bicycle parking management system according to claim 2, is characterized in that, described low-level security grade is that grip unlocks and body weight unlocks two kinds of unlocking manners; Middle rank safe class is that rhythm unlocks and direction unlocks two kinds of unlocking manners; Advanced security grade is that radio frequency unlocks and unlocked by fingerprint two kinds of unlocking manners, selects one or selects two kinds to use in conjunction with unlocking manner.

4. campus bicycle parking management system according to claim 3, it is characterized in that, described grip unlocks and body weight unlocks, park in platform in driving and increase pressure transducer, pressure transducer output current value, after carrying out digital-to-analog conversion, pass to flush bonding processor, by the read value of measurement of comparison value and database, if error is within 10%, can judge it is car owner.

5. campus bicycle parking management system according to claim 3, it is characterized in that, described rhythm unlocks, park in platform in driving and increase sound transducer, sensor uses LM358 as audio-frequency power amplifier, and at the built-in condenser type Electret condenser microphone of sensor, extraneous sound wave makes the electret film in microphone vibrate, cause the change of electric capacity, thus produce corresponding voltage change with it, voltage is received by data acquisition unit through A/D conversion, and send flush bonding processor to, by setting threshold value, magnitude of voltage below setting value is expressed as 0, the magnitude of voltage being greater than setting value is expressed as 1, can strong and weak two kinds of sound be identified and be encoded, coding is cipher mode, carry out unlocking and locking.

6. campus bicycle parking management system according to claim 3, it is characterized in that, it is the control lever installing four-way on bicycle parking platform that described direction unlocks, an I/O mouth of the corresponding flush bonding processor in each direction of control lever, by encoding to four I/O mouth conducting states, when one of them direction conducting, record the coding in this direction, by comparing the cryptopart in the cryptopart of input and database, can judge whether to unlock.