5 Hardware working
In This post we will discuss the working principle of the automatic car parking system based on microcontroller 8051. Here we will describe how the flow of hardware is completed.
In car parking control system the basic emphasis on the control of stepper motor by blocking the sensors beam. Three sensors are used to control one motor. Remaining hardware is use to display the number of cars in parking lot. Or in other words how many times laser beam is blocked.
The 89c51 is the brain of this whole hardware. It reads the input signals and start sending the stepping sequences to the motor. When the input beam of S1 is blocked motor start rotating in clockwise direction. This direction indicates the opening of the barrier, where S1 indicates that a car has come. The S2 sensor is used as the gate open limit sensor i.e. when S2=on it means gate is completely opened. Then a delay routine is called so that a particular time is adjusted for car to cross the gate. After that motor start rotating in counter clockwise direction, which indicates that gate, is closing now. Finally, when S3=on it indicates that gate is completely closed now. So motor will stop rotating.
A display is provided at the ground floor which is basically a counter that displays number of cars in each floor. It informs whether the floors are fully filled with the cars or is it having place in a particular floor or not. There is facility of lift to carry the car to up and down. Movement of Lift is controlled by stepper motor. An indicator with a green and red LED is kept in all the floors to indicate whether the lift is busy or is it ready to take the car up or down. If the red LED glows that means the lift is already engaged and the person has to wait for the green LED to glow. In this project we have provided three floors of a building for car parking. Maximum storage capacity of each floor is given as ten. Storage capacity can be changed according to the requirement.
After this the seven segment display incremented its value, which indicates that a car has entered in the parking lot. This display is basically for the people, which are driving the car. Similarly, serial interfacing is also used to display the number of cars in the parking lot. This display is for the person in control room.
The exit gate motor will also work on the same pattern. But after this the seven segment display and PC decreased the display number. This indicates that a car has left the parking lot.
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