1. RF ID Based Automatic Tollgate Opening
and Closing With vehicle details Logging
Synopsis
We can automate the toll bridge gate using the Radio
Frequency Identification tag. An RFID tag is fixed with a
vehicle. When a card comes in to the vicinity of the reader a
charge of some amount will be detected from the particular
person’s database and the toll bridge gate is automatically
opened for the user to move. The Mechanical Model is
constructed using a stepper motor. The movement of the
stepper motor is responsible for opening and closing action.
The Vehicle Details is stored into the computer memory
with date and time for future reference.
Hardware Requirements:
1. PIC Embedded Microcontroller
2. RFID Card with RFID tag
3. Mechanical Model depicting Toll gate
4. Stepper Motor for Opening and Closing Action
5. LCD Display
6. Rs232 Interface
Software Requirements:
89 RANGARAJAPURAM MAIN ROAD,KODAMBAKKAM,CHENNAI-24
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2. 1. Hitech C
Block Diagram
Vehicle Log
RFID RFID unit in
Card the Vehicle
Reader CPU
LCD Display
Rs232
Power
Supply
Alarm
Driver
PIC Microcontroller
Alarm
Opto Opto Opto Opto
Coupler Coupler Coupler Coupler
Pre Pre Pre Pre
Driver Driver Driver Driver
Power Power Power Power
Driver Driver Driver Driver
Stepper Motor
89 RANGARAJAPURAM MAIN ROAD,KODAMBAKKAM,CHENNAI-24
PL VISIT www.maastechindia.com,mobile:098402 34766
Mechanical Model

3. Pic Microcontroller:
PIC 16F877 microcontroller is used as a Processing unit.
RFID Card Reader:
RFID Card Reader used to read the card number from the
vehicle.
Power Supply:
Generates +12V and +5vDC Power supply from 230VAC.
Mechanical Model:
A mechanical model is constructed using a stepper motor
for gate opening and closing action
Stepper motor Driver:
Used to drive the motor in forward and reverse direction as
per the command given by the controller.
LCD Display:
Used to display the actions in the screen. (Gate opened,
Closed etc.)
Alarm and Alarm Driver:
The voltage from the controller is not enough to drive the
alarm. So an external transistor driver is necessary to drive the
12v alarm.
RS232 interface:
This interface is used to communicate to the computer. The
vehicle details and the time is logged into the computer using
this interface.
89 RANGARAJAPURAM MAIN ROAD,KODAMBAKKAM,CHENNAI-24
PL VISIT www.maastechindia.com,mobile:098402 34766