2.Block Diagram of The Project
8.Aplication & Advantage
In the project “Car Parking System” we have
shown the concept of an automatic car
parking system which will automatically sense
the entry & exit of cars through the gate and
then display the no. of cars in the parking lot.
The sensing of entry and exit of cars is done
with the help of Infrared transmitters and
Powered by +5V & +12V supply
Current consumption 0.45mA for
Microcontroller circuit, 0.75mA for switching
circuit, 200mA for amplification circuit
Automatic detection of any
Automatic opening and closing of entry gate
User interface using LCD and switches
Always display the number of cars present in
the Parking Lot
Power supplies are designed to convert high voltage AC
mains to a suitable low voltage supply for electronics
circuits and other devices. A power supply can be broken
down into a series of blocks, each of which performs a
For example a 5V regulated supply:
Transformer – steps down high voltage AC
mains to low voltage AC.
Rectifier – converts AC to DC, but the DC
output is varying.
Smoothing – smoothes the DC from varying
greatly to a small ripple.
Regulator – eliminates ripple by setting DC
output to a fixed voltage.
AT89C51 microcontroller used in this project.
It is MTP(Multi Time Programmable) IC.
a) 40 pin IC
b) 4Kb of Flash
c) 128Bytes of RAM
d) On Chip Oscillator and Clock Circuitry
e) Two 16-Bit Timer/Counter
The LCD, which is used as a display in the
system, is LMB162A. The main features of
this LCD are: 16*2 display, intelligent LCD,
used for alphanumeric characters & based on
The LCD contains
a) 8-pins are used as 8-bit data I/O.
b) 3-pins are used as control lines.
c) 2-pins are used as backlight & LCD voltage.
d) 2-pins in backlight & LCD ground.
e) 1-pins is used for contrast change
The 555 timer is used in the Infrared
transmitters and receivers. At the transmitter
it is used to produce a pulse of 38 kHz. This
pulse is then fed to the Infrared LED so that it
produces bursts of Infrared energy at the rate
of 38 kHz. The reason of transmitting
frequency being this much particular value is
that the Infrared receiver (i.e. TSOP 1738)
works at maximum efficiency when the
Infrared rays falling on it, are of 38 kHz.
The stepper motor is an electromagnetic
device that converts digital pulses into
mechanical shaft rotation.
The shaft or spindle of a stepper motor
rotates in discrete step increments when
electrical command pulses are applied to it in
the proper sequence.
1) This project can be used for parking
system in any shopping mall, multiplex
2) Can be used for industries, commercial
offices and educational institutes.
By the end of this project
Connections and testing in Proteus is studied.
Coding and compiling of a C program in Keil
Vision software is studied.
Hardware implementation by connecting
Schematic and making Board layout EAGLE is
The hardware kit is tested successfully by
embedding the C program – Hex file in the
The operation of microcontroller is analysed in
simulation and practically.