WIRELESS GAS LEAKAGE DETECTOR WITH DEVICE CONTROL

GROUP MEMBERS :

ARYA KRISHNAN

JOICE JOY

RESHMACHANDRAN

SREEVISHNU

NIBIN K N

STAFF COORDINATORS

Ms .VIJI CHANDRAN

Mrs. VEENA V S

INTRODUCTION

A smart system for device control while LPG gas leakage or fire situations.

Two main modules: the detection& transmission module and receiver module

The former module detect the change of LPG or CO gas concentration using a special sensing circuit

The sensor detects a change in gas concentration, transmitter module activates and sends a signal to receiver module

The receiver module activates and control the relay system

1

CONTENTS

INTRODUCTION OBJECTIVE BASIC BLOCK DIAGRAM DETAILED BLOCK DAIGRAM CIRCUIT DAIGRAM DESIGN AND ANALYSIS HARDWARE DEMONSTRATION RESULT AND DISCUSSION ADVANTAGES AND DISADVANTAGES APPLICATION CONCLUSION FUTURE SCOPE REFERENCES

BLOCK DIAGRAM

POWER SUPPLY COMPARATOR SECTION

TRANSMITTER RECEIVER SECTION

RELAY DRIVER

Figure: 1

To setup a wireless home safety gas leakage detector with device control and fire alarm

OBJECTIVE

2

.

3

Gas Sensor

Relay RF Receiver

RF TransmitterSensing Circuit Encoder

Decoder

BuzzerBLDC Motor

Figure: 2

DETAILED BLOCK DAIGRAM

Circuit diagram for transmission and detection section

4

+-

Figure 3

Circuit diagram for receiver section

7

Exhaust fan

buzzerFigure 4

voltage range of IC 7805=7V-35VCurrent rating of IC 7805=1ARipple factor = Y=1/(4√3fRC)Frequency f =50HzCapacitor for filter = Vac-rms/Vdc

.

5

Vac-rms = Vr/2√3Vdc= VMax-(Vr/2)Vr= VMax- VMin

Vr = 5.2-4.8 =0. 4VVac-rms = .3464V

Vdc = 5V

Y=0 .06928C1=1225.56µF  USE 1000µF  std

POWER SUPPLY DESIGN

TRANSFORMER RECTIFIER FILTER REGULATO

R

Supply

5v regulated output

1. POWER SUPPLY

Design and analysis

Figure 6

Figure 5

Input voltage range-5v to 35v.Current ratings-1A voltage range: 4.8-5.2 V

MQ 6High sensitivity to LPG, propane, iso-butane.Circuit voltage = 5vDetecting concentration scope: 200-10000ppm.

MQ 2High sensitivity to CO2 & CO.Circuit voltage = 5vDetecting concentration scope:500

Voltage regulator 7805

6

+

-

REFERENCE VOLTAGE

FROM MQ6/MQ2

LM339 TO TRANSMITTER

Comparator IC LM339

2.COMPARATOR SECTION

• Single supply quad comparators.• These Devices are Pb−Free, Halogen

Free/BFR Free• Low Input Offset Voltage• Input Common Mode Voltage Range to

GND• Low Output Saturation Voltage: 130 mv

Figure 7

Figure 8

7

3.TRANSMITTER SECTION

Transmitter Section

Encoder

Address/data input can be set

to one of the two logic states.

Used for the conversion of parallel data

into serial form

433MHz RF

Transmitter

The transmitter operates from a 3-12V supply.

Range of transmitter is approx 100

meters.

8

RF Transmitter 433Mhz ASK Features:

Frequency Range: 433.92 MHZ. Supply Voltage: 3~12V. Output Power : 4~16dBm

Figure 11

Figure 9

Figure 109

Receiver Section

Decoder

Conversion of serial data

into parallel form.

VT pin indicates valid

transmission

Converts the serial input into parallel

outputs.

433MHz RF Receiver Module

Long-range wireless control

applications.

Extract modulated

data from the carrier wave.

4.RECEIVER SECTION

10

RF Receiver 433Mhz ASK Features:

Integrated IF and data filters. Receiver Frequency:  433.92MHz Supply Current: 2.85mA Low power consumption. Operation voltage: 5 Volts

Figure 14

Figure 12

Figure 13 11

5.RELAY DRIVER

ULN 2003

12

HARDWARE DEMONSTRATION

13

RESULTDesigned and setup a Wireless Home

Safety Gas Leakage Detector .And the system is an efficient Fire Alarm.

14

ADVANTAGES It is used in house as LPG leakage detection It also detects alcohol so it is used as liquor

tester. The sensor has excellent sensitivity combined

with a quick fast response time. The system is highly reliable, tamper-proof and

secure. In the long run the maintenance cost is very less

when Compared to the present systems. It is possible to get instantaneous results and

with high accuracy. 15

DISADVANTAGESIt work only when at 5V power supply is given. Its sensitivity depends on Humidity and

temperature.

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APPLICATIONSa) Protection from any gas leakage in cars b) For safety from gas leakage in heating gas

fired appliances like boilers, domestic water heaters

c) Large industries which uses gas as their production

d) For safety from gas leakage in cooking gas fired appliances like ovens, stoves etc.

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CONCLUSION

The paper presents a low-cost, low power and simple system for device control while LPG gas leakage or fire situations..This system will have high application in industries and houses where it has been a bigger challenge for safety measures .

Future modification may include addition of micro controller and GSM module for concentration detection and SMS system

And our project will prove to be boom for households and industries.

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FUTURE SCOPE

19

REFERENCE Fraiwan L, Lweesy K, Bani-Salma, A Mani N (2011), “A Wireless Home Safety Gas

Leakage Detection System”, Proc. of 1st Middle East, . A CheSoh, M K Hassan, and A J Ishak “Vehicle Gas Leakage Detector”. D M Han and J H Lim (2010), “Smart Home Energy Management System Using

IEEE 802.15.4 and Zigbee”, IEEE Trans. on Consumer Electronics, Vol. 56, No. 3, pp. 1403-1410

G V Hippel (2005), “Democratizing Innovation”, MIT press, Cambridge, MA. Hanwei Electronics Co. Ltd (2002), MQ-6 GasSensor Technical Data. Kelvin R Sullivan, “Understanding Relays”, A tutorial on relays. M B Fish, R T Wainer, “Standoff Gas Leakage Detectors Based on Tunable Diodes

Laser Absorption Spectroscopy”. Nasaruddin N M B, Elamvazuthi I, Hanif N H H B M (2009), “Overcoming Gas

Detector Fault Alarm Due to Moisture”, Proc. of IEEE Student Conference on Research and Development, pp. 426-429.

. National Institute of Health (2004), “What You Need to Know About Natural Gas Detectors”, http://www.nidcd.nih.gov/health/smelltaste/ gas

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