Simple toll plaza system charges the toll tax from the user irrespective of the type of his vehicle. This project also considers the vehicle type while charging the toll amount. The RFID tag is used as a unique identity for account of a particular user.
When a vehicle drives through the toll plaza, its driver is prompted to scan his RFID tag. If the identity (serial number of the tag, i.e., 12 byte data) is matched with the one already stored in the system, the toll amount is deducted from his account. After this, the vehicle gets immediate access to drive through. All the features of the Simple toll plaza system are also provided in this project by interfacing RFID with AT89C51.
When a new user registers his vehicle, he is prompted to specify the vehicle type. LCD displays a message asking the user to ‘press 1 if 2 wheeler; press 2 if 4 wheeler’. After pressing one of these keypad switches, the vehicle is registered on the system.
Two-wheeler and four-wheeler categories have different charges. In this case the toll amount considered is Rs.10 & Rs.20, respectively. After registration, the user is prompted to scan his tag or ID. The serial code of the tag is identified by the reader module and is sent to AT89C51 for comparison with stored data. If the ID is matched by the microcontroller, the toll amount (depending on vehicle type) is deducted from user’s balance and user gets to drive through the plaza. If the tag is not recognized by the system, a message (‘Wrong ID’) is displayed on LCD screen.