Project Report On Intelligent Conference Hall

MINI PROJECT 2010 INTELLIGENT CONFERENCE HALL

CONTENTS

Page No.

1 Introduction 1

2 Block Diagram

2. 1 Basic Block Diagram

2. 2 Power Supply diagram

2

2

2

3 Block Diagram Description

3. 1 Power Supply

3. 2 Entry & Exit Sensor Circuit

3. 3 AT 89C51 Microcontroller

3. 4 Relay Driver Circuit

3. 5 Display Unit

3. 6 Motor & Its Driving Circuit

3

3

4

4

6

6

7

4 Circuit Diagram

4.1 Main Circuit Diagram

4.2 IR Transmitter Circuit

4.3 Power Supply

9

9

10

11

5 Working Of The System 12

1DEPARTMENT OF E&C MZC, KADAMMANITTA


6 Components List 14

7 Circuit Description

7. 1 Transmitter Circuit

7. 2 AT 89C51 Microcontroller

7. 3 Receiver Circuit

7. 4 Display Unit

7. 5 Motor Unit

7. 6 Relay Unit

15

15

15

16

17

17

18

8 PCB Layout 19

9 PCB Fabrication 20

10 Flow Chart 22

11 Program 23

12 Advantages 37

13 Disadvantage 38

14 Application 39

15 Conclusion 40

16 Bibliography 41

A1 Appendix 42



1. Introduction

Intelligent Conference Hall is a set up with automatic door

opening and room light controller along with visitor counter using a

Microcontroller. This is a reliable circuit that takes over the task of controlling the

door and room devices as well us counting number of persons in the room. The

total number of persons inside the room is also displayed on the seven segment

displays.

The microcontroller does the above job. It receives the signals

from the sensors, and this signal is operated under the control of software which is

stored in ROM. Microcontroller ATMEL 89C51 continuously monitor the Infrared

Receivers.

When any object pass through the IR Receiver's then

the IR Rays falling on the receiver are obstructed, this obstruction is sensed by the

Microcontroller and hence the door opens with the help of motor attached to it

along with incrementing the no. of persons shown in the display by one. Now the

devices in the room start operating. When any one comes to leave the room the

same happens along with decrementing the count shown in the display, and when

all the persons in the room comes to leave i.e., when the count becomes zero in the

seven segment display all the devices comes to OFF state. This circuit with a much

more improvement can be used in practical life in conference halls, bathrooms etc.



2. BLOCK DIAGRAM

2.1 Basic Block Diagram

Fig. 2.1

2.2 Power Supply Diagram

RECTIFIERTRANSFORMER

230V AC

FILTER REGULATOR+5V

+12VGND

Fig. 2.2


MicrocontrollerAtmel 89C51

Sensor 1

Motor driver for door accessing

Device switching unit

Display unit

Sensor 2

Power supply for all units


3. Block Diagram Description

The basic block diagram of the bidirectional visitor

counter with automatic light controller is shown in the above figure. Mainly this

block diagram consists of the following essential blocks.

1. Power Supply

2. Entry and Exit sensor circuit(Sensor 1 & Sensor 2)

3. AT 89C51 micro-controller

4. Relay Unit

5. Display unit

6. Motor & Its Driver Circuit For Door Opening

3.1 Power Supply

Here we used +12V and +5V dc power supply. The main

function of this block is to provide the required amount of voltage to essential

circuits. +12V is given to relay driver and motor whereas +5V is provided for

Microcontroller, Sensors, IC’s and for the display unit. IC 7805 & 7812 are used

here, which provides the +5V and +12V dc regulated power supply respectively.

A block diagram containing the parts of a

typical power supply is shown in fig 2.2. The ac voltage, typically 120 V rms, is

connected to a transformer, which steps that ac voltage down to the level for the

desired dc output. A diode rectifier then provides a full-wave rectified voltage that

is initially filtered by a simple capacitor filter to produce a dc voltage. This

resulting dc voltage usually has some ripple or ac voltage variation. A regulator

circuit can use this dc input to provide a dc voltage that not only has much less

ripple voltage but also remains the same dc value even if the input dc voltage varies

somewhat, or the load connected to the output dc voltage changes. This voltage

regulation is usually obtained using one of a number of popular voltage regulator

IC units. The regulated voltage is provided for the working of the circuit.



Transformer Rectifier Filter IC regulator Load

Fig 3.1.1

3.2 Enter and Exit Circuits (Sensor 1&2)

This is one of the main parts of our project. The

main intention of this unit is to sense the person. For sensing the person entering or

exiting the conference hall we are using the light dependent resistor (LDR) in the

transmission section and in the receiver end we set up a circuit using TSOP which

is connected to the microcontroller. Both at the transmitter and receiver end 555 is

used which works in the monostable mode. By using these sensors the

microcontroller senses any obstruction. On sensing any obstruction on sensor1 it in

forms the microcontroller which then opens the door and waits for the obstruction

in sensor2, on conforming the obstruction in sensor2 the counter will be count one

up and vice versa happens in the latter case. It is powered by the regulated output

from 7805 IC.

3.3 AT 89C51 Microcontroller

It is a low-power, high performance CMOS 8-bit

microcontroller with 8KB of Flash Programmable and Erasable Read Only Memory

(PEROM). The device is manufactured using Atmel’s high-density nonvolatile

memory technology and is compatible with the MCS-51TM instruction set and pin

out. The on-chip Flash allows the program memory to be reprogrammed in-system

or by a conventional nonvolatile memory programmer. By combining a versatile 8-



bit CPU with Flash on a monolithic hip, the Atmel AT89S52 is a powerful. In this

system port 3 is us as input port and port 1 is used as output port.

Microcontroller, which provides a highly flexible

and cost effective solution so many embedded control applications.

FEATURES OF MICROCONTROLLER

Design with micro-controllers has the following feature:-

i) As all the peripherals are integrated into a single chip, the overall system cost is

very low.

ii) The product is of a small size as compared to the Digital based systems and is thus

very handy.

iii) The system design requires very little efforts and is easy troubleshoot and maintain.

iv) As the peripherals are integrated with a microcontroller, the system is more reliable.

v) Though a µC have on-chip RAM, ROM and I/O ports, additional RAM, ROM I/O

ports may be interfaced externally, if required.

vi) The Micro-controllers with on-chip ROM provide a software security feature which

is not available with micro-processor based systems using ROM/EPROM.

vii) All these features are available in a 40 pin package as in an 8-bitprocessor.

The AT 89C51 is an 8-bit micro-controller with four ports (32

I/O lines) two - 16 bit timers/counters, on chip oscillator and clock circuitry. The

ATMAL 89C51 is designed to use in a sophisticated real - line instrumentation and

industrial control.

The special Features of 89C51 are;

1. Clock frequency 12 MHz

2. Program memory security

3. 4 KB ROM/EPROM

4. 128 KB RAM

5. 32- I/O lines (4-numbers of 8-bit ports)

6. Two 16-bit timer/counters



7. Programmable Full-Duplex serial channel

8. Boolean processor

9. 4 ms multiply and divide

3.4 Relay Driver Circuit

The relay driver circuit consists of a switching transistor and

a relay. Relay is an electromagnetic switch. It has one common point and one

normally open (N/O) and one normally close (N/C) contact.This block has the

potential to drive the various controlled devices. In this block mainly we are using

the transistor and the relays. One relay driver circuit we are using to control the

light. Output signal from AT89C51 is given to the base of the transistor, which we

are further energizing the particular relay, because of this appropriate device is

selected and it do its allotted function. Port 3 is used for the Relay Turn On and

Turn off Purpose. Relay is driven by 12V supply.

3.5 Display Unit

The display section is used to display the output from the

microcontroller i.e. the count of the persons inside the conference hall. The display

section contain 7-segment display unit. The display circuit consists of three S4301B

common Cathode display. The output of µC from port 1 is connected to the

a,b,c,d,e,f,g of the three 7- segment of display provided. It is switched into action

by the port 3 via. a transistor. The display can show up to 999, but here as it is used

for a conference hall we use to display only up to a count of 199. The display

common point 3, 8 is connected to + 5V. The 220 ohm resistors are used for current

limiting applications.

A single byte can encode the full state of a 7-segment-display. The

most popular bit encodings are gfedcba and abcdefg - both usually assume 0

is off and 1 is on. This table gives the hexadecimal encodings for displaying the

digits 0 to 9:



Digit gfedcba abcdefg a b c d e f g

0 0x3F 0x7E on on on on on on off

1 0x06 0x30 off on on off offoff

off

2 0x5B 0x6D on on off on onoff

on

3 0x4F 0x79 on on on on offoff

on

4 0x66 0x33 off on on off off on on

5 0x6D 0x5B onoff

on on off on on

6 0x7D 0x5F onoff

on on on on on

7 0x07 0x70 on on on off offoff

off

8 0x7F 0x7F on on on on on on on

9 0x6F 0x7B on on on on off on on

3.6 Motor & Its Driver Unit



This section consists of a DC Motor and a LM 293 IC.

The L293 is a quadruple high-current half-H driver. The L293 is designed to

provide bidirectional drive currents of up to 1 A at voltages from 4.5 V to 36 V.

L293 are designed to drive inductive loads such as relays, solenoids, dc and bipolar

stepping motors, as well as other high current/high-voltage loads in positive-supply

applications. The L293 is characterized for operation from 0°C to 70°C. It has four

op-amps which can drive up to four motors and also can work as bidirectional DC

motor control. This device is driven by the output from port 3 of the micro

controller. It is powered by +5V. Here in this case we work this as a bidirectional

DC motor control IC as shown in the fig. This IC drives the motor in both direction

for opening and closing of the door. Motor is driven by +12V supply voltage.

Fig 3.6.1



4. CIRCUIT DIAGRAM

4.1 Main Circuit Diagram



Fig 4.1

4.2 IR Transmitter Circuit



Fig. 4.2 Transmitter circuit



4.3 Power Supply

7812

VIN VOUT

+230v,50Hz

2.2k

22uf

6

3

6

2

1

470uf

7805

VIN VOUT

10uf

2.2k

2

1 3

+++

Fig. 4.3 Power Supply



5. WORKING OF THE SYSTEM

The power supply provides regulated D.C

voltage to the circuit where +5V is given to the µC, L293, LM555D and common

cathode display and +12 is given to the relay and motor. At first Reset the micro-

controller, for this capacitor connected in the 9th (RESET) pin should charge and

discharge and this change take place through R3 resistor. Due to this discharge high

pulse is applied to RESET pin and thus micro-controller resets. The transmitter

emits IR rays which fall on the TSOP at the receiver. As soon as a person cut the

transmitted IR rays, the rays falling in the receiver i.e. TSOP 1738 gets interrupted

and its O/P goes high which is connected to a 555 IC .The O/P from the 555 is

connected to the port 3 of the micro controller. In both transmitter and receiver

section 555 is configured to function in monostable mode.

Transmission circuit is used to generate the

modulated 36 kHz IR signal. Now we adjust the preset in the transmitter to get a 38

kHz signal at the O/P and at around 1.4K we get a 38 kHz signal. This signal is

projected into the TSOP embedded in the receiver circuit.

The output goes high when the there is an

interruption in the IR falling on the TSOP and it return back to low after the time

period determined by the capacitor and resistor in the circuit i.e. around 3 second.

The output from the TSOP is connected to the trigger pin2 of the 555 IC via.

SL100 transistor. SL100 is to trigger the IC 555 which is configured as monostable

multivibrator. In the monostable mode, the 555 timer acts as a “one-shot” pulse

generator. The pulse begins when the 555 timer receives a signal at the trigger input

from TSOP that falls below a third of the voltage supply. The width of the pulse is

determined by the time constant of an RC network, which consists of

a capacitor (C) and a resistor (R). The pulse ends when the charge on the C equals

2/3 of the supply voltage i.e. when TSOP O/P goes low. Output of 555 IC is given

to the Port 3 of the microcontroller. As a person cuts both the sensors in forward

direction the counter gets incremented by one or if it occurs in opposite direction

the counter gets decremented by one. The output of the counting is displayed in the


http://en.wikipedia.org/wiki/Capacitor


Common Cathode display provided which is connected to port1 of the

microcontroller. It displays up to a count of 199.

The microcontroller does the rest with the program

written on it. The program is written according to the algorithm developed, which is

given below,

Algorithm

1) Start

2) Check Sensor 1(S1) or Sensor 2(S2) is high

3) If S1 or S2 is high open the door

4) Check which sensor is high, if S1 is high wait for S2 to become high, go to STEP 6

5) Else, if S2 is high wait for S1 to become high, go to STEP 9

6) If S2 is high, count increment & switch ON the room devices

7) Delay, door close, go to STEP 1.

8) If S1 is not high, no changes, delay, door close, go to STEP 1.

9) If S1 is high, count decrement, if count= =0, room devices off, delay, door close, go

to STEP 1.

10) If else S1 is low, no change, delay, door close.

In case if a person holds in the position between the

transmitter and receiver the door stays in the opened position, since the O/P of

TSOP goes high. Also, if a person obstructs the first sensor and does not cut the

second one the door opens at the time of interruption and closes as soon as he

leaves without a change in the counting output.

The motor is provided for the purpose of opening and closing of the

door. It is controlled using a L293 IC which is capable of working it in both

directions. The IC L293 is driven by the O/P from the port 3 of the microcontroller.

The IC is powered by regulated +5V from 7805 IC and motor is driven by +12V.



6. COMPONENTS LIST

Microcontroller – AT89S52

IC – 7805 , LM555D

IR LED

Sensor – TSOP 1738 (Infrared Sensor)

Transformer – 6-0-6, 1 A

Resistors

Capacitor – (1000 µF,47 µF,1 µF),25V

Disc capacitor – 0.1µF

Relay Driver - (12V,1A)

Rectifier diode – IN4007,1N4148

Transistor – BC 547, SL 100

7-Segment Display – S4301B

Motor driver – L293

DC Motor



7. CIRCUIT DESCRIPTION

7.1 TRANSMITTER CIRCUIT

The transmitter circuit is framed using two main

components:-

1. 555 timer IC is configured to function as a basic monostable multivibrator.

2. IR LED to emit IR rays at 38 kHz.

A monostable multivibrator is a timing circuit that

changes state once triggered, but returns to its original state after a certain time delay.

It got its name from the fact that only one of its output states is stable. It is also

known as a 'one-shot’. In this circuit, a negative pulse applied at pin 2 triggers an

internal flip-flop that turns off pin 7's discharge transistor, allowing C4 to charge up

through R12. At the same time, the flip-flop brings the output (pin 3) level to 'high'.

When capacitor C4 as charged up to about 2/3 Vcc, the

flip-flop is triggered once again, this time making the pin 3 output 'low' and turning

on pin 7's discharge transistor, which discharges C4 to ground. This circuit, in effect,

produces a pulse at pin 3 whose width t is just the product of R12 and C4, i.e.,

t=R12C4. IR Transmission circuit is used to generate the modulated 36 kHz IR

signal. The IC555 in the transmitter side is to generate 36 kHz square wave. Adjust

the preset in the transmitter to get a 38 kHz signal at the O/P around 1.4K we get a

38 kHz signal. Then you point it over the sensor and its O/P will go low when it

senses the IR signal of 38 kHz. +5V is connected to the Reset pin 4 and 1N4148 is

provided to introduce a delay in between ON & OFF time.

7.2 AT 89C51 MICROCONTROLLER

The AT 89C51 is an 8-bit microcontroller with four ports (32

I/O lines), two 16-bit timers/counters, on chip oscillator and clock circuitry. Power-

on-reset is achieved by connecting a 10µF capacitor and a 10K resistor to Pin 9

(Reset) of the Micro-controller. During reset condition, program counter of the micro



controller is initialized as ‘0000H’. Hence the micro-controller must reset as soon as

the circuit is switched on because the starting address of the program in the memory

is 0000H. This requirement ends in the application of a POWER ON RESET circuit.

For this the Reset pin must keep in logic High level for

some time and this logic high level must be removed after sometime. An RC network

can satisfy this requirement. The R-C network is connected across the power supply

rails. And the mid-point of the RC network is connected to the RESET pin of the

micro-controller. For manual Reset Function push switches are connected across

positive rail RESET pin. The timing clock is generated with the help of a crystal. The

both ends of the crystal are connected to the X1 and X2 pins [18 and 19] of the AT

89C51.Typically, a quartz crystal and capacitors are employed. The crystal frequency

is the basic internal clock of frequency of the micro-controller. The manufactures

make available 89C51 designs that can run at specified maximum and minimum

frequencies, typically 1MHZ to 16MHZ. Minimum frequencies imply that some

internal memories are dynamic and must always operate above a minimum frequency

or data will be lost. Serial data communication needs often dictate the frequency of

the oscillator. The time to execute a particular instruction is than found by

multiplying C by 12 and dividing the product by crystal frequency.

Tinst = ¿C x 12d)÷(Crystal frequency) In this crystal, two disc capacitors are

connected in series with ground. These capacitors are used to initial resonance circuit

for crystals are used for noise free oscillations of crystal. Each oscillation produced

in this way will reach each register and then to the EPROM. At the time of each

oscillation, data’s included in each register (software program) will active.

7.3 RECEIVER CIRCUIT

The receiver circuit is framed using two main

components:-



1. 555 IC working in monostable mode.

2. TSOP 1738 working as IR receiver.

The IR transmitter will emit modulated 38 kHz IR signal and at

the receiver we use TSOP1738 (Infrared Sensor). The output goes high when the

there is an interruption in the rays falling on TSOP and it return back to low after the

time period determined by the capacitor (C10) and resistor (R14) in the circuit. That

is around 3 second. SL100 is used to trigger the 555 which is configured as

monostable multivibrator. The collector of the SL100 transistor is connected to the

pin 2 of 555.

Output of 555 IC is given to the Port 3 of the microcontroller.

7.4 DISPLAY UNIT

The display unit is composed of three 7-

Segment LED display. It works according to the output from the port 1 of the 89C51.

It is powered by +5V from the regulated power supply provided by 7805 IC. The

VCC to the 7-Segment display is connected through a transistor BC547 and through

the resistors (R4, R5, and R6 for the corresponding display) which are connected to

the collectors of the transistors. The emitter of the transistor is connected to the point

taken from the internally shortened pins 3 & 8. Port3 is connected to the base of the

transistor through the resistors (R7, R8, and R9 for corresponding display). The

transistor here serves as a switch.

7.5 MOTOR UNIT

The motor section is composed of two main

components:-

1. L 293 IC

2. DC Motor

L293 IC is capable of driving the motors at a time. Here it is

used to drive the motor provided in both directions. The output from port 3 of the



microcontroller is connected to the IC. Pin 4, 5, 12, 13 are grounded. The 1N4007

diodes are provided to prevent the back EMF generated. 9V DC motor is used here

which is powered by +12V supply. According to the events in the transmitter and

receiver section the motor is driven by the IC according to the instructions of µC.

7.6 RELAY UNIT

The relay is connected with a +12V power supply. The O/P from port

3 of the microcontroller is connected to the base of the transistor BC547. The emitter

of the transistor is grounded. When the base of the transistor goes high its O/P goes

high, switching the relay. 1N4007 diode is provided to prevent the back EMF of the

circuit. The relay switches the room devices ON or OFF. It switches on even if a

single person resides inside the room and if all the persons leave the room, it

switches OFF all the room devices.



8. PCB LAYOUT



9. PCB FABRICATION

Designing of PCB is a major step in the

production of PCB is a major. It forms a distinct factor in electronic performance

and reliability. The productivity of a PCB, its assembly and service ability also

depends on the design. The designing of a PCB consists of designing of the layout

followed by the preparation of the artwork. The layout should include all the

relevant aspects an details of the PCB design while the art work preparation brings

it to the form required for the production process. The layout x can be designed

with the help of any one of the standard layout edition software’s such as Eagle,

Orcad or Edwin XP. Hence a concept, clearly defining all the details of the circuits

and partly of the equipment, is a perquisite and the actual layout can start.

Depending on the accuracy required, the artwork might be produced a 1:1 or 2:1

even 4:1 scale. It is best prepared on a 1:1 scale.

PCB fabrication involves the following steps:-

a) First the layout of the PCB is generated using the software ORCAD. First step

involves drawing the circuit CIS which is a section of ORCAD. Then the layout is

obtained using layout plus. This layout is printed on a paper.

b) This printed layout is transferred to a Mylar sheet and touched with black ink.

c) The solder side of the Mylar sheet is placed on the shining side of the copper board

and is placed in a frame. It is than exposed to sunlight, with the Mylar sheet facing

the sunlight.

d) The exposed copper board is put in hydrogen peroxide solution. It is then put in hot

water; shook till unexposed region becomes transparent.



e) This is put in cold water and then the rough side is struck in to the skill screen. This

is then pressed and dried well.

f) The plastic sheet of the five - star is removed leaving the pattern on the screen.

g) A copper clad sheet is cut to the size and cleaned. This is then placed under the

screen.

h) Acid resist ink is spread on the screen, So that the pattern of the tracks and pad is

obtained on the copper clad sheet. It is dried.

i) The dried sheet is then etched using ferric chloride solution till all the unwanted

copper is etched away.

j) The unwanted resist ink is removed using sodium hydroxide solution, holes are

then drilled.

k) The components are soldered neatly on the board without dry soldering.



10. FLOW CHART

Start

Sensor1==0,Sensor

2==0

Door Closed

NO

Door Open

YES

If Sensor1== HIGH

If Sensor 1or Sensor 2

is HIGH

If Sensor2==HIGH

If Sensor1==HIGH

NO

YES

CounterIncremented by

1,Room Devices ON

YES

If Sensor2==HIGH

Delay

CounterDecrement by 1

YES

NO

YES

Delay

Door Closed

NO

IfCounter==0

Room Devices Off

YES

YES

NO

Fig. 10.1 Flow Chart



11. PROGRAM

STARTUP

DIS_A EQU P1.5

DIS_B EQU P1.4

DIS_C EQU P1.3

DIS_D EQU P1.1

DIS_E EQU P1.2

DIS_F EQU P1.6

DIS-G EQU P1.7

DIS1 EQU P3.3

DIS2 EQU P3.4

DIS3 EQU P3.5

LDR1 EQU P3.0

LDR2 EQU P3.1

BUZZER EQU P1.0

LIGHT EQU P3.2

MOT1 EQU P2.0

MOT2 EQU P2.1

LIMT EQU P2.2

LIMT1 EQU P2.3

DSEG ; This is internal data memory

ORG 20H ; Bit addressable memoryBITS: DS 1UP BIT BITS.0DWN BIT BITS.1COUNT: DS 1SPEED: DS 1VALUE _1: DS 1VALUE _2: DS 1VALUE _ 3: DS 1COUNTER: DS 1STACK: DS 1 ; Stack begins hereDST: DS 1



CSEG ; Code begins here ;-------------------------------------------------------------------------------------------------------- ; PROCESSOR INTERRUPT AND RESET VECTORS ;---------------------------------------------------------------------------------------

ORG 00H ; Reset JMP MAIN ORG 000BH ; Timer Interrupt0 JMP REFRESH

;&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&; MAIN PROGRAM;&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

MAIN: CLR BUZZER

MOV SPEED, # 00H MOV COUNT, #00H

MOV VALUE_1, #00H MOV VALUE_2, #00H MOV VALUE_3, #00H

MOV COUNTER, #00H MOV DST, #03H CLR MOT1 CLR MOT2 CLR LIMT CLR LIMT1

CLR LIGHT

CLR DIS1 CLR DIS2 CLR DIS3

MOV TMOD, #01H ; enable timer0 for scanningMOV TLO, #00HMOV THO, #0FDHSETB ETOSETB EA

SETB TRO

AJMP ZAZA

ASSA: AJMP ASAA

ZAZA: SETB LIMT1



JNB LIMT1, OK1 CALL DELAYCALL DELAYCALL DC

OK1: SETB LDR1JNB LDR1, ASSACALL DPCALL DELAYSETB LDR2JNB LDR2, $

;&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&; UP COUNTER;&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

SETB BUZZERINC COUNTERCJNE R5, #00H, LOOP1AJMP LOOP2

LOOP1: SETB LIGHT LOOP2: MOV R5, COUNTER DOIT: MOV A, #10

CLR CSUBB A, R5JC ZX1JZ AQ1INC VALUE_1AJMP CVC

AQ1: MOV VALUE_2, #01HMOV VALUE_1, #00HAJMP CVC

ZX1: MOV A, #20CLR CSUBB A, R5JC ZX2JZ AQ2INC VALUE_1AJMP CVC











AQ6: MOV VALUE_2, #06HMOV VALUE_1, #00H

AJMP CVC


AQ7: MOV VALUE_2, #07HMOV VALUE-1, #00HAJMP CVC








AQ10: MOV VALUE_3, #01HMOV VALUE_2, #00HMOV VALUE-1, #00HAJMP CVC

ZX10: MOV A, COU NTERCLR CSUBB A, #100JZ AQQ1JC ZXX1MOV R5, AAJMP DOIT

AQQ1: MOV VALUE_3, #02HMOV VALUE_2, #00HMOV VALUE-1, #00HAJMP CVC



ZXX1: MOV VALUE_1, #00HMOV VALUE_2, #00HMOV VALUE_3, #OOH

CVC;&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

CALL DELAYCLR BUZZERJB LDR2, $AJMP ZAZA

ZAZAA: JMP ZAZAASAA: SETB LDR2

JNB LDR2, ZAZAACALL DPCALL DELAYSETB LDR1JNB LDR1

;&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&; DOWN COUNTER;&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

SETB BUZZERDEC COUNTERCJNE R5, #00H, LOOP4CLR LIGHT

LOOP4: MOV R5, COUNTERMOV A, R5INC ACJNE A, #00H, DOIT1MOV VALUE_1, #00HMOV VALUE_2, #00HMOV VALUE_3, #00HMOV COUNTER, #00HAJMP CVCV

DOIT1: MOV A, #10

CLR CSUBB A, R5JC AZX1JZ AAQ1MOV R6, VALUE_1CJNE R6, #00H, GHGMOV VALUE_2, #00HMOV VALUE_1, #09H



AJMP CVCV

GHG: DEC VALUE_1

AJMP CVCVAAQ1: MOV VALUE_2, #01H

MOV VALUE-1, #00HAJMP CVCV

AZX1: MOV A, #20CLR CSUBB A, R5JC AZX2JZ AAQ2MOV R6, VALUE_1CJNE R6, #00H, GHG1MOV VALUE_2, #01HMOV VALUE_1, #09HAJMP CVCV

GHG1: DEC VALUE_1

AJMP CVCV AAQ2: MOV VALUE_2, #02H

MOV VALUE_1, #00HAJMP CVCV


GHG2: DEC VALUE_1

AJMP CVCV AAQ3: MOV VALUE_2, #03H


AZX3: MOV A, #40CLR CSUBB A, R5



JC AZX4JZ AAQ4MOV R6, VALUE_1CJNE R6, #00H, GHG3MOV VALUE_2, #03HMOV VALUE_1, #09HAJMP CVCV

GHG3: DEC VALUE_1




GHG4: DEC VALUE_1




GHG5: DEC VALUE_1






GHG6: DEC VALUE_1




GHG7: DEC VALUE_1



AZX8: MOV A, #90CLR CSUBB A, R5JC AZX9JZ AAQ9MOV R6, VALUE_1CJNE R6, #00H, GHG8MOV VALUE_2, #08HMOV VALUE_1, #09H



AJMP CVCV GHG8: DEC VALUE_1



AZX9: MOV A, #100CLR CSUBB A, R5JC AZX10JZ AAQ10MOV R6, VALUE_1CJNE R6, #00H, GHG9MOV VALUE_3, #00HMOV VALUE-2, #09HMOV VALUE_1, #09HAJMP CVCV

GHG9: DEC VALUE_1


MOV VALUE_2, #00HMOV VALUE_1, #00HAJMP CVCV

AZX10: MOV A, COUNTERCLR CSUBB A, 100JZ AAQQ1JC AZXX1MOV R5, AMOV A, COUNTERCJNE A, #199, JKJKMOV VALUE_3, #01H

JKJK: AJMP DOIT1

AAQQ1: MOV VALUE_3, #02HMOV VALUE_2, #00HMOV VALUE_1, #00HAJMP CVCV



AXZZ1: MOV VALUE_1, #00HMOV VALUE_2, #00HMOV VALUE_3, #00H

CVCV:;&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

CALL DELAYCLR BUZZERJB LDR1, $AJMP ZAZA

;&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&; 7 SEGMENT DISPLAY;&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

DISP: MOV R2, SPEEDCJNE R2, #00H, AAS1CLR DIS-ACLR DIS-B

CLR DIS-CCLR DIS-DCLR DIS-ECLR DIS-FSETB DIS-GRET

AAS1: CJNE R2, #01H, AS2 CLR DIS_B

CLR DIS_C SETB DIS_A

SETB DIS_DSETB DIS_ESETB DIS_FSETB DIS_GRET

AS2: CJNE R2, #02H, AS3 CLR DIS_A

CLR DIS_BCLR DIS_DCLR DIS_G

SETB DIS_CSETB DIS_FRET



AS3: CJNE R2, #03H, AS4 CLR DIS_A

CLR DIS_BCLR DIS_CCLR DIS_DCLR DIS_G

SETB DIS_ESETB DIS_FRET

AS4: CJNE R2, #04H, AS5 CLR DIS_B CLR DIS_C

CLR DIS_FCLR DIS_G

SETB DIS_ASETB DIS_DSETB DIS_ERET

AS5: CJNE R2, #05H, AS6 CLR DIS_A CLR DIS_C

CLR DIS_DCLR DIS_FCLR DIS_G

SETB DIS_BSETB DIS_ERET

AS6: CJNE R2, #06H, AS7 CLR DIS_A CLR DIS_C

CLR DIS_DCLR DIS_ECLR DIS_FCLR DIS_GSETB DIS_BRET

AS7: CJNE R2, #07H, AS8 CLR DIS_A CLR DIS_B

CLR DIS_CSETB DIS_DSETB DIS-E



SETB DIS_FSETN DIS_GRET


CLR DIS_CCLR DIS_DCLR DIS_ECLR DIS_FCLR DIS_GRET


CLR DIS_CCLR DIS_DCLR DIS_FCLR DIS_GSETB DIS_ERET

AS10: MOV SPEED, #00HAJMP DISP

;&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

REFRESH:INC COUNTMOV R4, COUNT

QA1: CJNE R4, #01H, QA2MOV SPEED, VALUE_1SETB DISICLR DIS2CLR DIS3CALL DISPAJMP DOWN

QA2: CJNE R4, #02H, QA3MOV SPEED, VALUE_2CLR DIS1SETB DIS2CLR DIS3CALL DISPAJMP DOWN



QA3: CJNE R4, #03H, QA4MOV SPEED, VALUE_3CLR DIS1CLR DIS2SETB DIS3CALL DISPAJMP DOWN

QA4: MOV COUNT, #01HMOV R4, COUNTAJMP QA1

DOWN : MOV TL0, #0FFH ; reload the timer for scanningMOV TH0, #0F2HRETI

&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

DELAY: MOV R1, #OFFH

RE1: MOV R2, #5FHRE: NOP

DJNZ R2, REDJNZ R1, RE1

RET; DOOR OPENINGDP: SETB MOT1

SETB LIMTJNB LIMT, $CLR MOTIRET

; DOOR CLOSING DC: SETB MOT2

SETB LIMT1JNB LIMT1, $CLR MOT2RET

END



12. ADVANTAGES

Advantages

It is low cost and user friendly.

Since it switches OFF the room devices as soon as the persons

occupying the room leave, it functions as a power saver.

It automatically sets as a status symbol luxury aid.



13. DISADVANTAGES

Disadvantages

It can be applied only when a single person cuts the sensor, hence it

cannot be used when two or a crowded number of persons cross

simultaneously at a same instant.

It must be implemented with a digital code lock or a finger print

analyzer to filter the required personals into the conference hall

otherwise any one can enter.



14. APPLICATION

Application

It can be used in boats with additional safety feature such, the no. it

counts is set to a specific value & when exceeds the limit it alarms.

It can be used as a luxuries aid in Star Hotels, Airports and Trains or

as a helping aid in the toilet of old agers.

A little modified form of this project can control room devices

according to the no. of persons occupying the room.



15. CONCLUSION

In our present day life style we are looking for more and more hands

free equipments. This project “INTELLIGENT CONFERENCE HALL” proves to be

very useful not only for the use in a conference hall but also it can be implemented as

helping aid for blinds and old agers in their usual life. This project is less costly and

easy to implement in our daily life both in the case of luxury as well as for our daily life

system. In case of very high security conference sessions this circuit can be

implemented with addition of some security feature and hence safety too can be assured.

The heart of this project is AT89C51 micro-controller. The working of this system is

very accurate and error free.

16. BIBLIOGRAPHY



Reference Books

Programming in ANSI C: E Balaguruswamy.

The 8051microcontroller and embedded systems: Muhammad Ali

Mazidi, Janice Gillespie Mazidi.

The 8051 microcontroller: Kenneth J. Ayala.

Website

www.datasheets4u.com

www.8051.com

www.atmal.com


http://www.8051.com/

http://www.datasheets4u.com/


APPENDIX


Project Report On Intelligent Conference Hall

Documents

Transcript of Project Report On Intelligent Conference Hall