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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
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
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.
16
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.
17
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.
18
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
.