Automatic Two Gate interlock Control System for Toll Tax using 89C51

Title of the project : Automatic Two Gate interlock Control System for Toll Tax using 89C51
Domain : Embedded Systems Design
Software : Embedded C, Keil, Proload
Microcontroller : AT89C51
Power Supply : +5V, 500mA Regulated Power Supply
Crystal : 11.0592MHz
Sensor : IR Sensors

This project is a standalone Automatic two door interlock control system for toll tax using AT89C51 microcontroller. This project is useful in all applications where two door interlocking is needed. Use of embedded technology makes this closed loop feedback control system efficient and reliable. Micro controller (AT89C51) allows dynamic and faster control. AT89C51 micro controller is the heart of the circuit as itcontrols all the functions.
The aim of this project is to automize the toll tax collection on highways. Two IR TX – RX pairs are used in this project to identify the entry or exit of the vehicle. These two IR TX – RX pairs are arranged each one on two gates. The TX and RX are arranged face to face across the gate so that the RX should get IR signal continuously.
Initially the gate is closed. Whenever any vehicle comes in front of the entry gate, the IR RX identifies it since the IR signal gets disturbed. Then the microcontroller opens the entry gate by rotating the stepper motor. After some delay, the gate will beclosed.
After collecting the tax, the operator presses a switch. Then the exit gate opens for the vehicle to leave. The microcontroller closes the gate only after the vehicle exits out. And again the entry gate sensor will be waiting for the next vehicle to enter.
This project uses regulated 5V, 500mA power supply. Unregulated 12V DC is used for relay. 7805 three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac out put of secondary of 230/12V step down transformer.



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