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The indicator section contains 2
LED’s , RED & GREEN which are present in all the floors.
RED LED signifies that the lift is presently busy and shall
not entertain any car to enter but if GREEN LED glows, it
suggests that the lift is ready and the car can enter the
particular floor. Beeper and LED's are connected to port C
upper of 8255.
One more advantage of beeper is
that; when a person tries to enter the lift irrespective of
finding the display section to be FFF (means the floors are
already filled), program sends a signal to Beeper section and
it starts beeping indicating that he is not supposed to enter
the lift since all the floors are already filled.
3.3.
Lift and motor section
In lift section, there is a light
beam and LDR to know whether a car has entered the
lift or not. When the GREEN LED of indicator section glows,
that means the lift is ready for the car to enter. When the
car enters the lift, the light beam falls on LDR present in
the lift gets cut and it gives a signal that a car has entered
the lift. Then program decides which floor lift has to go and
gives a signal to motor section. Circuit diagram of sensor
present in lift is shown bellow.
The motor section is a mechanical
part of the model which is used for taking the lift
up/down. When the lift has to go up, program gives the signal
and the motor rotates clockwise and if it has to go down, it
rotates anticlockwise. First 4 pins port A is connected to
motor. Power transistors must be connected to drive the motor.
Circuit diagram of this section is shown bellow.
3.4. Sensor section
Sensor section contains
LDR's .These LDR's are connected to each floar to give
information if any car has to come down. When a person
needs to come down from a particular floor to ground floor, he
is expected to focus the headlight the car onto the LDR placed
in that floor. When light falls on LDR its resistance
decreases. Hence IC 555 triggers and gives a signal. Program
identifies that signal and gives a signal to motor
section. The circuit diagram sensor is shown bellow. In this
project same circuits is connected to three floors. This
circuit is different if you compared with that of lift sensor
shown above.
3.5.
LCD Section:
In this project LCD is used to display some messages which is
useful to car owners. Here 2X16 LCD ( Liquid Crystal
Display) is used. This is used to display messages like
WELCOME TO
CAR PARKING SYSTEM
LIFT IS BUSY
PLEASE WAIT
PLEASE ENTER
YOUR PASSWORD
Circuit diagram of
LCD section is shown bellow. LCD is interfaced with 8051
microcontroller.
Click here to study more about interfacing
LCD to 8051.
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Other Microcontroller projects
and articles.
Digital
IC Tester using 8951 Microcontroller
Automatic
Railway Gate Control
Interfacing
an LCD to the 8051 Microcontroller
8051
microcontroller Instruction Set
8051
Microcontroller port programming
Programmable
number lock system
Water
level indicator cum controller
Robotic
car
Intelligent
Train Engines
DC
Motor Controlling System using PIC
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