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Automatic Parking Using UHF RFID Technology

UHF RFID is a technology for wireless data transmission which operates on frequencies in the UHF domain (ranging from 400MHz to 950MHz). By introducing UHF RFID technology, vehicle identification can be performed at distances of more than 10m. The line of sight between identifier and reader is not required. Large number of RF identifiers can be read at once. Thanks to UHF RFID technology, there is no need for user cooperation, in terms of putting card into the reader’s field or precise vehicle positioning. The UHF RF identifier can be located at an appropriate position in the vehicle (for example on the inside of the windshield). As opposed to remote controllers, UHF RFID identifiers used in this system are passive. To access the parking space the user only drives his car through the UHF RFID reader field. Validation is done automatically without any further user involvement. The best system is user invisible system.

 

In the proposed system, CL7206B2 integrated UHF RFID reader is used. It operates in the frequency range from 865MHz-868MHz (European standard). The power output of the reader can be adjusted from 0dBm to 33dBm. At maximum power output, the reader’s range is around 15m.


Extensible Integrated UHF RFID ReaderExtensible Integrated UHF RFID Reader



RF identifiers in this system are in form of a thin, flexible card, the size of a bank card. The card is passive and powered by the reader’s field. It consists of: antenna, microchip and memory block. The card supports EPC GEN2 protocol and has a unique EPC (Electronic Product Code) serial number, which is 96 bits (12 bytes) long. This EPC code identifies the card.

 

In short, the system operates as follows. The car with the RF identifier enters the reader’s field. The reader reads the card and sends the data to the microcontroller development board. The microcontroller development board receives the data, adopts and forwards it further to the server with the logger application and the database. The logger application receives the data, checks the status of the card, sends a response back to the development board and records the event in the database. On the other hand, the web application enables the review and the analysis of the collected data. If the card has access privileges, the microcontroller waits for a confirmation from the magnetometer that the vehicle is detected in front of the ramp. The KEIL MCB2140 board then sends a control signal to the ramp. After that, the ramp raises and the vehicle can enter the parking space.

   

Tags : UHF RFID reader integrated UHF RFID reader UHF RFID technology

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