Toll Gate Automation Using VHDL

Introduction

  Tollgates are mainly made for preventing passage until a toll is paid. The advantage of Toll gate automation is the use of automatic equipment in place of manual effort. We can use this system in several places such as forests, zoo, botanical gardens and parks. Tollgate counter will be made at the entrance and exit gate of such places. At the entrance each vehicle will be provided a pass, i.e. RFID based pass. RFID tags act as data carriers. Before getting inside these places every vehicle will be checked properly and the time and date should be noted. 

  Vehicle owners, who frequently pass through tollgates, can also opt for a prepaid monthly or seasonal pass, which when swiped (contact less) will deduct the appropriate amount, by using an automated card reader. Further, the Electronic Toll Gate System through its RFID solution, which will be fitted in vehicles, will enable a wireless transaction, allowing the vehicle to move inside those areas.  At the exit gate RFID pass will be returned back to toll gate exit counter. The return time of the card is automatically entered according to which the time duration is calculated and the bill will be generated. The Electronic Toll Collection System consists of a Toll Collection System, card reader and a computer that collects data. The moment the vehicle comes near to the toll gate, the RFID unit in the vehicle communicates with the unit at the tollgate, which establishes identity, deducts the appropriate toll amount and electronically instructs the toll gate/barricade to be opened, enabling the vehicle to pass through the toll gate without stopping.

An automatic Zone lighting arrangement will also be provided to switch ON/OFF the lights in a zone depending on the zone that is to be illuminated. We will facilitate a depiction of timing control for the zone lighting in the GUI.

The front End coding will be done in MODELSIM 5.8 and a test bench and behavioral simulation will be depicted using MODELSIM5.8.

The Binaries will be created using the Xilinx ISE and the actual functioning will be shown using a model employing a CPLD/FPGA kit.

This project will facilitate the understanding of the following topics:

• Coding in VHDL.
• CPLD/FPGA based Designing
• PCB designing and concepts
• Visual basic programming.
• Parallel port interfacing.
• Xilinx ISE package
• Motor control mechanism.
• RFID technology. 

BLOCK DIAGRAM:    

The CPLD/FPGA based embedded system is the heart of the system. Database can be made on visual basic. Visual basic code is loaded on the PC’s situated at the toll both. The information of the vehicle will be received through the RFID reader, which will read the tag data available on a 125 KHz carrier frequency emitted by RFID card. The card information will pass to the PC via COM port and MAX232, which is, connected between PC and CPLD/FPGA Kit. MAX232 is required where +/_12 volt supply is not used. Stepper motor control mechanism is controlled through CPLD/FPGA kit.