90 Degree Car Parking System

90 DEGREE CAR PARKING SYSTEM

ABSTRACT:

an automatically controlled parking system with a vertical conveyor and

storage shelves arranged on both sides. Tower, shaft and tower/shaft

arrangements are possible with entrance at bottom, top or in between. The

system can include up to 3 rows of parking places either side of the vertical

conveyor.

The Parksafe dispenses with the need for ramps and driving lanes, offers

security against theft, damage and vandalism and is environmentally friendly

in respect of its compact construction and reduced emission of exhaust

gases. General running costs (lighting, ventilation, routine maintenance etc.)

are less than for conventional multi-storey car parks.

automatic parking system for stacking cars on top of each other within

a very small floor plan area. 10 - 80 cars in max. 30 levels

can be supplied as tower (above ground), shaft (below ground) or

tower/shaft variants.

multiple row arrangements are possible with 1, 2 or 3 rows beside the

vertical conveyor.

adaptable to individual project requirements

integrated turntable option

safe and secure parking of cars with safety advantages for users.

fast access times (dependent upon number of levels and lifts)

different car heights can be accommodated

large, luxury cars of up to 2.50 tonnes weight (e.g. Mercedes-Benz/

BMW/ Jaguar) can be accommodated.

easy operation with several control options (e.g. magnetic card,

remote control)

CHAPTER – 1

INTRODUCTION

Automatic multi-stored car parking system is very good substitute for car

parking area. Since in modern world, where space has become a very big

problem and in the era of miniaturization its become a very crucial necessity

to avoid the wastage of space in modern, big companies and apartments etc.

In space where more than 100 cars need to be parked, it’s a very difficult

task to do and also to reduce the wastage of area, this system can be used.

This Automatic Car Parking enables the parking of vehicles-floor after floor

and thus reducing the space used. Here any number of cars can be park

according to requirement. This makes the system modernized and even a

space-saving one. This idea is developed using 8051 Microcontroller. Here

program is written according to this idea using 8051.

CHAPTER – 2

BLOCK DIAGRAM:

DESCRIPTION:

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.

Any one can enter to first or second floor. The third floor in this

model is for VIP’s only. Therefore when VIP’s are to be entering they are

expected to enter their password and they will be taken to the third reserved

floor. The password will be of 4 digits. The processor checks for the

password entered and if it is found to be wrong, a siren is heard. In this

particular model 10 passwords are stored. So when a password is entered,

the processor checks for it and it is compared with 10 passwords. It indicates

whether it is the correct one or not.

When the car enters the lift, the LDR detects its presence and sends a

signal to glow RED LED indicating that the lift is busy. It also sends a signal

to motor which makes the motor to rotate. After RED LED glows the lift

will take the person and the car up to the floor where the space for parking is

available. (For VIP it will be the third floor). When the lift reaches the first

floor, the processor compares the filled amount to that of the already fed

capacity of that floor, and if it finds that the first floor is fully filled , it goes

to the second floor and thus the procedure stops here. As soon as a car is

placed in a particular floor, the display counter at the ground floor

increments as to indicate the floor capacity has decreased by one. After the

lift places the car in a particular floor, it comes back to its normal position

and that time, the motor that drives it , also stops. Now processor sends

signal to glow GREEN LED indicating that lift is free.

When a person needs to come down from a particular floor to ground

floor, he is expected to focus the headlight onto the LDR placed in that floor.

Now sensor section sends signal to motor that the lift has to be send back to

that particular floor and sends a signal to glow RED LED indicating that the

lift is busy. As soon as the lift reaches that particular floor car should come

inside the lift, the display counter at the ground floor decrements by one as

to indicate the floor capacity has increased by one. Lift comes back to its

normal position and that time, the motor that drives it , also stops. Now

processor sends signal to glow GREEN LED indicating that lift is free.

If there no parking taking place, the processor carries out the job

according to the following priority:-

1. It checks whether any password is entered.

2. It checks whether any car is entered to lift.

3. It checks whether any car headlight is pressed in front of LDR placed

in each floor.

It is like a round robin system.

CIRCUIT EXPLANATIONS:

Following are the main sections in this model.

1. Display section

2. Keyboard, indicator & Beeper section

3. Lift & motor section

4. Sensor section

5. LCD section

6. Software program

Program is written using 8051 microcontroller. Two 8255 IC's are

connected to 8051. All circuits are interfaced with 8255.

DISPLAY SECTION:

This section displays the floor number along with the number of cars which

has been already parked in that particular floor. So whenever a car is ready

to either come down or go up, the program either decrements the count or

increments the count automatically according to the going up or coming

down of a car. Display section is done by interfacing with 8255(PPI) of

8051.Here 3 ports of 8255 are connected to three 7-segment display. Block

diagram of this section is shown.

KEYBOARD, INDICATOR & BEEPER

In this section,12 switches are connected in matrix form and it has three

LED’s , RED, GREEN&YELLOW. The person, needed to enter the

password has to wait until the GREEN LED glows and when it glows, he

has to press the “START” button first. This time the RED LED glows. Then

the person has to enter the password. As soon as it is entered, the program

checks it with the already stored passwords. If it is correct, YELLOW LED

glows. If the entered password is wrong, beeper starts beeping signifying the

incorrectness of the password entered. Circuit diagram of keyboard is shown

bellow.

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

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 below.

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.

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 different if you compared with that of

lift sensor shown above.

CHAPTER – 3

ATMEGA MICROCONTROLLER:

4.1 ATMEGA 8089S52 DESCRIPTION-

AT89S52 MICROCONTROLLER

Features

Compatible with MCS®-51 Products

8K Bytes of In-System Programmable (ISP) Flash Memory –

Endurance: 1000 Write/Erase Cycles

4.0V to 5.5V Operating Range

Fully Static Operation: 0 Hz to 33 MHz

Three-level Program Memory Lock

256 x 8-bit Internal RAM

32 Programmable I/O Lines

Three 16-bit Timer/Counters

Eight Interrupt Sources

Full Duplex UART Serial Channel

Low-power Idle and Power-down Modes

Description

The AT89S52 is a low-power, high-performance CMOS 8-bit

microcontroller with 8K bytes of in-system programmable Flash memory.

The device is manufactured using Atmel’s high-density nonvolatile memory

technology and is compatible with the Indus-try-standard 80C51 instruction

set and pin out. The on-chip Flash allows the program memory to be

reprogrammed in-system or by a conventional nonvolatile memory pro-

grammer. By combining a versatile 8-bit CPU with in-system programmable

Flash on a monolithic chip, the Atmel AT89S52 is a powerful

microcontroller which provides a highly-flexible and cost-effective solution

to many embedded control applications.

The AT89S52 provides the following standard features: 8K bytes

of Flash, 256 bytes of RAM, 32 I/O lines, Watchdog timer, two data

pointers, three 16-bit timer/counters, a six-vector two-level interrupt

architecture, a full duplex serial port, on-chip oscillator, and clock circuitry.

In addition, the AT89S52 is designed with static logic for operation down to

zero frequency and supports two software selectable power saving modes.

The Idle Mode stops the CPU while allowing the RAM, timer/counters,

serial port, and interrupt system to continue functioning. The Power-down

mode saves the RAM con-tents but freezes the oscillator, disabling all other

chip functions until the next interrupt or hardware reset.

Figure.3.5. Block diagram of the microcontroller

Figure.3.6. Pin diagram of 89s52

Pin Description

VCC

Supply voltage.

GND

Ground.

Port 0

Port 0 is an 8-bit open drain bidirectional I/O port. As an output

port, each pin can sink eight TTL inputs. When 1s are written to port 0 pins,

the pins can be used as high-impedance inputs. Port 0 can also be configured

to be the multiplexed low-order address/data bus during accesses to external

program and data memory. In this mode, P0 has internal pull-ups. Port 0 also

receives the code bytes during Flash programming and outputs the code

bytes during program verification. External pull-ups are required during

program verification.

Port 1

Port 1 is an 8-bit bidirectional I/O port with internal pull-ups. The

Port 1 output buffers can sink/source four TTL inputs. When 1s are written

to Port 1 pins, they are pulled high by the inter-nal pull-ups and can be used

as inputs. As inputs, Port 1 pins that are externally being pulled low will

source current (IIL) because of the internal pull-ups. In addition, P1.0 and

P1.1 can be configured to be the timer/counter 2 external count input

(P1.0/T2) and the timer/counter 2 trigger input (P1.1/T2EX), respectively, as

shown in the following table. Port 1 also receives the low-order address

bytes during Flash programming and verification.

Table.3.3. Port functions

Port 2



to Port 2 pins, they are pulled high by the internal pull-ups and can be used


source current (IIL) because of the internal pull-ups. Port 2 emits the high-

order address byte during fetches from external program memory and during

accesses to external data memory that uses 16-bit addresses (MOVX @

DPTR). In this application, Port 2 uses strong internal pull-ups when

emitting 1s. During accesses to external data memory that uses 8-bit

addresses (MOVX @ RI), Port 2 emits the contents of the P2 Special

Function Register. Port 2 also receives the high-order address bits and some

control signals during Flash programming and verification.

Port Pin Alternate Functions

P1.0 T2 (external count input to Timer/Counter 2), clock-out P1.1

T2EX (Timer/Counter 2 capture/reload trigger and direction control) P1.5

MOSI (used for In-System Programming) P1.6 MISO (used for In-System

Programming) P1.7 SCK (used for In-System Programming)

Port 3



to Port 3 pins, they are pulled high by the internal pull-ups and can be used


source current (IIL) because of the pull-ups. Port 3 receives some control

signals for Flash programming and verification. Port 3 also serves the

functions of various special features of the AT89S52, as shown in the

following table.

Table.3.4.Alternate Port functions of 89s52

RST

Reset input. A high on this pin for two machine cycles while the

oscillator is running resets the device. This pin drives high for 98 oscillator

periods after the Watchdog times out.

ALE/PROG

Address Latch Enable (ALE) is an output pulse for latching the

low byte of the address during accesses to external memory. This pin is also

the program pulse input (PROG) during Flash programming. In normal

operation, ALE is emitted at a constant rate of 1/6 the oscillator frequency

and may be used for external timing or clocking purposes. Note, however,

that one ALE pulse is skipped during each access to external data memory.

If desired, ALE operation can be disabled by setting bit 0 of SFR location

8EH. With the bit set, ALE is active only during a MOVX or MOVC

instruction. Otherwise, the pin is weakly pulled high. Setting the ALE-

disable bit has no effect if the microcontroller is in external execution mode.

PSEN

Program Store Enable (PSEN) is the read strobe to external

program memory. When the AT89S52 is executing code from external

program memory, PSEN is activated twice each machine cycle, except that

two PSEN activations are skipped during each access to external data

memory.

EA/VPP

External Access Enable. EA must be strapped to GND in order to

enable the device to fetch code from external program memory locations

starting at 0000H up to FFFFH. Note, however, that if lock bit 1 is

programmed, EA will be internally latched on reset. EA should be strapped

to VCC for internal program executions. This pin also receives the 12-volt

programming enable voltage (VPP) during Flash programming.

XTAL1

Input to the inverting oscillator amplifier and input to the

internal clock operating circuit.

XTAL2

Output from the inverting oscillator amplifier.

Memory Organization

MCS-51 devices have a separate address space for Program and

Data Memory. Up to 64K bytes each of external Program and Data Memory

can be addressed.

Program Memory

If the EA pin is connected to GND, all program fetches are

directed to external memory. On the AT89S52, if EA is connected to VCC,

program fetches to addresses 0000H through 1FFFH are directed to internal

memory and fetches to addresses 2000H through FFFFH are to external

memory.

Data Memory

The AT89S52 implements 256 bytes of on-chip RAM. The upper

128 bytes occupy a parallel address space to the Special Function Registers.

This means that the upper 128 bytes have the same addresses as the SFR

space but are physically separate from SFR space. When an instruction

accesses an internal location above address 7FH, the address mode used in

the instruction specifies whether the CPU accesses the upper 128 bytes of

RAM or the SFR space.

OSCILLATOR CHARACTERISTICS:

XTAL1 and XTAL2 are the input and output, respectively, of an inverting

amplifier that can be configured for use as an on-chip oscillator, as shown in

Fig.4. Either a quartz crystal or ceramic resonator may be used. To drive the

device from an external clock source, XTAL2 should be left unconnected

while XTAL1 is driven, as shown in the figure. There are no requirements

on the duty cycle of the external clock signal, since the input to the internal

clocking circuitry is through a divide-by-two flip-flop, but minimum and

maximum voltage high and low time specifications must be observed.

CHAPTER – 4

SOFTWARE IMPLEMENTATION

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.

Circuit is now over. Next part is coding. Here is the complete listing of the

code for vertical car parking system. Create the hex file and download it to

the microcontroller and place the IC in circuit. automated car parking

system is ready.

mov r0,#19h ; Storing the equivalent codes of

mov @r0,#0bfh ; common cathode display.

inc r0

mov @r0,#86h

inc r0

mov @r0,#0dbh

inc r0

mov @r0,#0cfh

inc r0

mov @r0,#0e6h

inc r0

mov @r0,#0edh

inc r0

mov @r0,#fdh

inc r0

mov @r0,#87h

inc r0

mov @r0,#0ffh

inc r0

mov @r0,#0e7h

inc r0

mov @r0,#39h

inc r0

mov @r0,#00h

mov r0,#25h ; Storing the equivalent codes of

mov @r0,#40h ; common anode.

inc r0

mov @r0,#0f9h

inc r0

mov @r0,#24h

inc r0

mov @r0,#30h

inc r0

mov @r0,#99h

inc r0

mov @r0,#12h

inc r0

mov @r0,#02h

inc r0

mov @r0,#78h

inc r0

mov @r0,#00h

inc r0

mov @r0,#18h

inc r0

mov @r0,#0eh

mov r0,#45h ; Storing ten 4 digit passwords in

mov @r0,#00h ; internal RAM.

inc r0

mov @r0,#01h

inc r0

mov @r0,#02h

inc r0

mov @r0,#03h

inc r0

mov @r0,#08h

inc r0

mov @r0,#00

inc r0

mov @r0,#05h

inc r0

mov @r0,#01h

inc r0

mov @r0,#01h

inc r0

mov @r0,#00

inc r0

mov @r0,#00

inc r0

mov @r0,#01h

inc r0

mov @r0,#06h

inc r0

mov @r0,#00

inc r0

mov @r0,#05h

inc r0

mov @r0,#00

inc r0

mov @r0,#09h

inc r0

mov @r0,#08h

inc r0

mov @r0,#08h

inc r0

mov @r0,#06h

inc r0

mov @r0,#03h

inc r0

mov @r0,#01h

inc r0

mov @r0,#01h

inc r0

mov @r0,#07h

mov a,#08

STORE: dec a

inc r0

mov @r0,a

inc r0

movx @r0,a

inc r0

movx @r0,a

inc r0

movx @r0,a

djnz a,STORE

mov dptr,#2023h ; Configuring two 8255 ports.

mov a,#81h

movx @dptr,a

mov dptr,#2043h

mov a,#80h

movx @dptr,a

mov r3,#00 ; Clears the display.

mov r4,#00

mov r5,#00

mov a,r5

call LED_CODES

mov dptr,#2040h

movx @dptr,a

inc dptr

movx @dptr,a

inc dptr

movx @dptr,a

mov dptr,#2022h

mov a,#30h

movx @dptr,a

mov sp,#11h

call lcdwel ; Calling LCD display subroutine.

REPEAT: clr psw.3

clr psw.4

mov dptr,#2022h

movx a,@dptr

cjne a,#31h,DONE ; Comparing whether car is inside the

lift.

mov a,#0ah

xrl a,r4

jz SIREN ; Call SIREN if second floor is full.

call lcdbusy

mov a,#10h

movx @dptr,a ; send lift is busy signal.

call DELAY

mov r7,#02 ; Give number of rotations to motor so

that...

mov r6,#02h ; lift goes to first floor.

call MOTER_UP ; Call motor to rotate clockwise.

mov a,#0ah

xrl a,r3

jz I_FULL ; If first floor is full then jump to I_FULL

inc r3

call DELAY

mov a,r3 ; Increment the number of car in first floor.

call LED_CODES ; Display the number of cars.

mov dptr,#2042h

movx @dptr,a

mov r7,#02h ; Again load the number of rotations to

motor

mov r6,#02h

call MOTER_DOWN ; Call motor to rotate anticlockwise.

mov dptr,#2022h

mov a,#30h

movx @dptr,a ; send lift is free signal.

call lcdwel

sjmp DONE

I_FULL: mov r7,#02h ; Give number of rotations to motor so

tha...

mov r6,#02h ; ...lift goes to second floor.


inc r4

call DELAY

mov a,r4 ; Increment the number of car in second floor.

call LED_CODES ; Display the number of cars.

mov dptr,#2041h

movx @dptr,a

mov r7,#04h ;Again load the number of rotations to

motor.

mov r6,#02h

call MOTER_DOWN ; Call motor to rotate anticlockwise.

mov dptr,#2022h

mov a,#30h

movx @dptr,a ; send lift is free signal.

call lcdwel

jmp DONE

SIREN: mov a,#70h ; Subroutine for SIREN.

movx @dptr,a

GO: movx a,@dptr

jb a.0,GO

jmp OVER1

DONE: movx a,@dptr ; Compare if start button of the

cjne a,#33h,OVER1 keyboard is pressed.

mov a,#0ah

xrl a,r5

jz SIREN ; Call SIREN if third flore is full.

mov a,#00

movx @dptr,a

call lcdbusy

setb psw.3

CLEAR: mov r1,#0ah ; Scanning entered password from

keyboard

mov r0,#04h

START: mov dptr,#2020h

mov a,#0eh

movx @dptr,a

WAIT: mov dptr,#2022h

movx a,@dptr

mov r7,#00

xrl a,r7

jz WAIT

mov a,#02

LOOP: mov r6,a

mov dptr,#2020h

movx @dptr,a

mov dptr,#2022h

movx a,@dptr

jnz COLSCAN

inc r7

mov a,r6

rl a

jmp LOOP

COLSCAN: rrc a

jc DONE1

inc r7

inc r7

inc r7

sjmp COLSCAN

OVER1: jmp OVER

DONE1: mov a,r7

clr psw.3

setb psw.4

mov r0,#19h

add a,r0

mov r0,a

mov a,@r0

clr psw.4

setb psw.3

mov dptr,#2021h

movx @dptr,a

inc dptr

UP: movx a,@dptr

jnz UP

mov a,#0ah

xrl a,r7

jz CLEAR

mov a,#0bh

xrl a,r7

jz BIT_CLEAR

mov a,r7

mov @r1,a ; Store entered each digit.

inc r1

mov r7,#0ffh

HEAR: djnz r7,HEAR

mov r7,#0ffh

HEAR1: djnz r7,HEAR1

djnz r0,START

mov r7,#0ah ;Checking whether entered 4 digit

password

mov r0,#45h ; .... is any one of the stored password.

CHECK: mov r1,#0ah

mov r6,#03h

CHECK1:mov a,@r0

xrl a,@r1

jnz NEXT

inc r1

inc r0

djnz r6,CHECK1

mov dptr,#2022h

mov a,#90h

movx @dptr,a

clr psw.3

jmp OK ; Jump to OK if password is correct.

NEXT: inc r0

djnz r6,NEXT

inc r0

djnz r7,CHECK

mov dptr,#2022h

mov a,#50h

movx @dptr,a

AGAIN: movx a,@dptr

cjne a,#53h,AGAIN

clr psw.3

mov a,#30h ; Give SIREN if entered password is

wrong.

movx @dptr,a

REMAIN: movx a,@dptr

xrl a,#33h

jz REMAIN

mov r0,#0ffh

STAY: djnz r0,STAY

call lcdwel

jmp OVER

LED_CODES:setb psw.4

mov r0,#25h

add a,r0

mov r0,a

mov a,@r0

clr psw.4

ret

BIT_CLEAR: dec r1

inc r0

mov r6,#0ffh


mov r6,#0ffh


jmp START

OK: movx a,@dptr

cjne a,#91h,OK

mov a,#10h

movx @dptr,a

mov a,#00

mov dptr,#2021h

movx @dptr,a

call DELAY

mov r7,#06h ; Give number of rotations to motor so

that

mov r6,#02h ; lift goes to third flore.


inc r5 ;Increment the number of car entered to third

call DELAY ;... floor and display the number of cars.

mov a,r5

call LED_CODES

mov dptr,#2040h

movx @dptr,a

mov r7,#06h

mov r6,#02h

call MOTER_DOWN ; Call motor to rotate

anticlockwise.

call lcdwel

jmp OVER

MOTER_UP:push r5 ;Subroutine for motor to rotate

clockwise.

mov r5,#70h

mov r0,r6

mov dptr,#2020h

mov a,#88h

h3: movx @dptr,a

rl a

mov r2,#30

h1: mov r1,#255

h2: djnz r1,h2

djnz r2,h1

djnz r5,h3

mov r5,#0ffh

djnz r6,h3

mov r6,r0

djnz r7,h3

pop r5

ret

MOTER_DOWN:push r5 ;Subroutine for motor to rotate

anticlockwise.

mov r5,#70h

mov r0,r6

mov dptr,#2020h

mov a,#88h

h6: movx @dptr,a

rr a

mov r2,#30

h4: mov r1,#255

h5: djnz r1,h5

djnz r2,h4

djnz r5,h6

mov r5,#0ffh

djnz r6,h6

mov r6,r0

djnz r7,h6

pop r5

ret

DELAY: mov r1,#10h ; Subroutine for Delay

DELAY1: mov r2,#0ffh

DELAY2: mov r0,#0ffh

DELAY3: djnz r0,DELAY3

djnz r2,DELAY2

djnz r1,DELAY1

ret

OVER: mov dptr,#2022h

mov a,#30h

movx @dptr,a

movx a,@dptr

cjne a,#32h,I_OVER

mov a,#10h

movx @dptr,a

call lcdbusy

mov r7,#02h

mov r6,#02h


dec r3 ; Decrements the number of cars entered to

mov a,r3 ;... first floor and display the number of

call LED_CODES ;... cars in first floor.

mov dptr,#2042h

movx @dptr,a

call DELAY

mov r7,#02h

mov r6,#02h

call MOTER_DOWN ; Call motor to rotate

anticlockwise.

mov dptr,#2022h

mov a,#30h

movx @dptr,a

call lcdwel

I_OVER: movx a,@dptr

cjne a,#34h,II_OVER

mov a,#10h

movx @dptr,a

call lcdbusy

mov r7,#04h

mov r6,#02h



mov a,r4 ;...second floor and display the number of

call LED_CODES ;... cars in second floor.

mov dptr,#2041h

movx @dptr,a

call DELAY

mov r7,#04h

mov r6,#02h

call MOTER_DOWN ; Call motor to rotate clockwise.

mov dptr,#2022h

mov a,#30h

movx @dptr,a

call lcdwel

II_OVER: movx a,@dptr

cjne a,#38h,END

mov a,#10h

movx @dptr,a

call lcdbusy

mov r7,#06h

mov r6,#02h



mov a,r5 ;... third floor and display the number of

call LED_CODES ;... cars in third floor.

mov dptr,#2040h

movx @dptr,a

call DELAY

mov r7,#06h

mov r6,#02h

call MOTOR_DOWN ; Call motor to rotate

anticlockwise.

mov dptr,#2022h

mov a,#30h

movx @dptr,a

call lcdwel

END: jmp REPEAT

lcdwel: push r3 ; Subroutine for LCD to display

push r4 ; ‘ WELCOME TO CAR PARKING

SYSTEM ’

mov a,#3ch

call command

mov a,#0eh

call command

mov a,#01h

call command

mov a,#06h

call command

mov a,#80h

call command

mov a,#'W'

call data

mov a,#'E'

call data

mov a,#'L'

call data

mov a,#'C'

call data

mov a,#'O'

call data

mov a,#'M'

call data

mov a,#'E'

call data

mov a,#' '

call data

mov a,#88h

call command

mov a,#'T'

call data

mov a,#'O'

call data

mov a,#' '

call data

mov a,#'C'

call data

mov a,#'A'

call data1

mov a,#'R'

call data

mov a,#aah

call command

mov a,#'P'

call data

mov a,#'A'

call data

mov a,#'R'

call data

mov a,#'K'

call data

mov a,#'I'

call data

mov a,#'N'

call data

mov a,#'G'

call data

mov a,#' '

call data

mov a,#'S'

call data

mov a,#'Y'

call data

mov a,#'S'

call data

mov a,#'T'

call data

mov a,#'E'

call data

mov a,#'M'

call data

pop r4

pop r3

ret

command:mov p1,a

clr p3.4

setb p3.3

clr p3.3

mov r3,#50

A: mov r4,#255

R: djnz r4,R

djnz r3,A

ret

data: mov p1,a

setb p3.4

setb p3.3

clr p3.3

mov r3,#50

AAA: mov r4,#255

AA: djnz r4,AA

djnz r3,AAA

ret

lcdbusy: push r4 ;Subroutine for LCD to display

push r3 ; ‘ LIFT IS BUSY PLEASE WAIT ’

mov a,#3ch

call command

mov a,#0eh

call command

mov a,#01h

call command

mov a,#06h

call command

mov a,#80h

call command

mov a,#'L'

call data

mov a,#'I'

call data

mov a,#'F'

call data

mov a,#'T'

call data

mov a,#' '

call data

mov a,#' '

call data

mov a,#'I'

call data

mov a,#'S'

call data

mov a,#88h

call command

mov a,#' '

call data

mov a,#' '

call data

mov a,#'B'

call data

mov a,#'U'

call data

mov a,#'S'

call data

mov a,#'Y'

call data

mov a,#aah

call command

mov a,#'P'

call data

mov a,#'L'

call data

mov a,#'E'

call data

mov a,#'A'

call data

mov a,#'S'

call data

mov a,#'E'

call data

mov a,#' '

call data

mov a,#'W'

call data

mov a,#'A'

call data

mov a,#'I'

call data

mov a,#'T'

call data

mov a,#' '

call data

pop r3

pop r4

ret

CHAPTER – 5

CONCLUSION

90 Degree Car Parking System

Documents

Transcript of 90 Degree Car Parking System