The project was an embedded system project, where an alarm will go on whenever an inbuilt sensor sense any gas around it. Project describes the software simulation and also the working circuit which was used to implement the circuit on a board by incorporating all the required elements.

1. PROJECT REPORT
GAS LEAKAGE ALARM PROJECT
Submitted to the Department of
ELECTRONICS AND COMMUNICATION ENGINEERING
INDERPRASTHA ENGINEERING COLLEGE, GHAZIABAD
63, Site 4, Industrial Area, Sahibabad, Ghaziabad, Uttar Pradesh.
Gautam Buddha Technical University
PROJECT GUIDE: MRS. SHIKHA GUPTA
SUBMITTED BY:
UDIT JAIN (0903031113)

2. CERTIFICATE
This is to certify that minor project report on “GAS LEAKAGE
ALARM” which is submitted by UDIT JAIN in partial fulfilment
of the requirement for the degree of B.Tech in department of
Electronics and Communication Engineering of Inderprastha
Engineering College , is a record of his own work carried out
under my/our supervision. The matter embodied in this thesis
is original and has not been submitted for the award of any
degree.
Project Guide:
MRS.SHIKHA GUPTA
SubmittedBy:
UDIT JAIN

3. DECLARATION
I hereby declare that this submission is my own work and that
to best of my knowledge and belief. It contains no material
previously published or written by any person or material
which to a substantial extent has been accepted for the award
of any other degree or diploma of the university or other
institute of higher learning, accept where due
acknowledgement has been made in the text.
UDIT JAIN
DATE OF SUBMISSION:
3/12/2012

4. ACKNOWLEDGEMENT
It gives me a great sense of pleasure to present the report of
the Electronic Circuit Design Lab Project undertaken during
B.Tech, final year.
I acknowledge the enormous assistance and excellent co-
operation given by my respected mentor MRS. SHIKHA
GUPTA and Mr. VIPUL BHATNAGAR.
Their sincerity, thoroughness and perseverance has been a
constant source o inspiration for me.
I also take the opportunity to acknowledge the contribution of
Professor A.K. Giri , Head of Department of Electronics &
Communication Engineering , Inderprashtha Engineering
College , Sahibabad for his full support and assistance during
the development of the project.
Also, I would like to express my heartfelt indebtedness
towards all faculty members and staff members of the
department for their kind assistance and cooperation during
the development of my project.
Last but not the least, I acknowledge my friends who helped
me directly or indirectly for the success of project.

5. CONTENTS
AIM OF PROJECT
COMPONENTS REQUIRED
SIMULATION TOOL USED
CIRCUIT DESCRIPTION
SIMULATION RESULT
OBSERVATION
RESULT
DATA SHEETS OF MAJOR COMPONENTS
REFERENCES

6. AIM OF PROJECT:
This Project is designed to detect the LPG Gas Leakages and to a
lerts the users through Audio-Visual Indications. This Project is
designed to detect the LPG & 4 other Dangerous Gases from a range
200(PPM) to 10,000 PPM. Whenever there is LPG concentration of
1000 ppm (parts per million) in the area, A buzzer is connected to
produce audible alert signal. This LPG Gas Sensor can be used to ma
ke wireless Gas leak detector in home security system .
COMPONENTS REQUIRED:
S.no Components used Range/Type Quantity
1 SEN-1327 gas sensor 200ppm-10,000ppm 1no
2 IC 555 TIMER (8 pin) 4.5 to 15 V(Vcc) 1no
3 Transistor SL100 1no
4 Zener diode 5V 1no
5 Speaker 0.5W,8 Ω 1no
6 Battery 9V 1no
7 LED 1V 1no
8 Capacitors 0.1uf 2no
9 Resistors
Variable resistor
10kΩ
4.7kΩ
1kΩ
22 Ω
560Ω
10kΩ
1no
1no
1no
1no
1no
1no
10 On /off switch and
Connecting wires
______ ______

7. SIMULATION TOOL USED:
PSpice v16.0
PSpice is a SPICE analog circuit and digital logic simulation program
for Microsoft Windows. The name is an acronym for Personal
Simulation Program with Integrated Circuit Emphasis.
CIRCUIT DESCRIPTION:
DESIGN OF THE PROJECT:
In this project we have used MQ-6 gas sensor. Whenever LPG gas is
leaked the sensor detects and it passes signal to timer circuit. Here
we have used IC 555 timer which acts as astable multivibrator.Then it
will be given to Transistor driver circuit which activates buzzer and
LED and alerts the user through audio-visual indications.
MQ-6 gas sensor is used in the gas sensor module. The sensor can
also be used to detect combustible gases, especially methane.

8. The circuit operates off a 9V PP3 battery. Zener diode ZD1 is used to
convert 9V into 5V DC to drive the gas sensor
Whenever there is LPG concentration of 1000 ppm (parts per million)
in the area, the OUT pin of the sensor module goes high. This signal
drives timer IC 555, which is wired as an astable multivibrator. The
multivibrator basically works as a tone generator.
Output pin 3 of IC 555 is connected to LED1 and speaker-driver
transistor SL100 through current-limiting resistors R5 and R4,
respectively. LED1 glows and the alarm sounds to alert the user of
gas leakage. The pitch of the tone can be changed by varying preset
VR1. Use a suitable heat-sink for transistor SL100.

9. SIMULATION RESULTS:

11. OBSERVATIONS:
The LED glows and BUZZER beeps whenever there is logic high at
the pin 4 of 555 timer ic.
RESULT:
Circuit has high sensitivity to propane, butane, isobutene,LPG and
natural gas. The sensor can also be used to detect combustible
gases, especially methane. This circuit has been tested with LPG gas
and was found to work very fine.
DATA SHEETS OF MAJOR COMPONENTS:
Three major components used in this project are:
1). IC- LM 555 timer
2). MQ-6 LPG gas sensor
3). SL100 transistor
Their Data sheets are attached within the report.

12. REFERENCES
o www.wikipedia.org
o www.datasheetreference.com
o www.electronicsforu.com
o www.examsadda.com