synopsis
DESCRIPTION
synopsisTRANSCRIPT
Synopsis
LPG gas is supplied in pressurized steel cylinders. As this
gas is heavier than air, when it leaks from a cylinder it
flows along floor and tends to settle in low spots such as a
basement. This can cause fire or suffocation if not dealt
with. Here is a circuit that detects the leakage of LPG gas
and alerts the user through audio-visual indications.
This LPG Gas Sensor (MQ6), ideal sensor for use to
detect the presence of a dangerous Liquefied petroleum
gas (LPG) and it has high sensitivity to propane, butane,
isobutene, natural gas. The sensor can also be used to
detect combustible gases, especially methane. This circuit
can detect leakages in your Home, car or in a service
station, storage tank environment. This unit can be easily
implemented to industrial level by upgrading its ranges.
This project is designed to detect the LPG from 200parts
per million (PPM) to 10,000 PPM. 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. A buzzer is connected to produce audible alert
signal.
This LPG Gas Sensor can be used to make wireless Gas
leak detector in home security system .The LPG Gas
Sensor Module is designed to enable LPG detection
interface to Microcontroller without ADC Channels. By
providing a GSM modem we can receive “SMS ALERTS”
also..
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.
COMPONENTS U:
S.n
o
Components used Range/Type Quantit
y
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
______ ______
The SEN-1327 gas sensor module from
RhydoLABZ,kochi is used in this circuit. This LPG Gas
Sensor (MQ6), ideal sensor for use to detect the presence
of a dangerousLiquefied petroleum gas (LPG) and it has
high sensitivity to propane, butane, isobutene, natural gas.
The sensor can also be used to detect combustible gases,
especially methane. This sensor has a high sensitivity and
fast response time. The drive circuit is very simple. This
circuit can detect leakages in your Home, car or in a
service station, storage tank environment. This unit can be
easily implemented to industrial level by upgrading its
ranges.
FEATURES:
Uses the MQ-6 LPG Gas Sensor Easy SIP interface Compatible with most microcontrollers we can
upgrade this to provide SMS alerts also Onboard Status and Power LED Onboard Pot for threshold setting On board microcontroller This sensor has a fast response time Good sensitivity to Combustible gas in wide
range Long life and low cost Simple drive circuit High sensitivity to Propane, Butane and LPG
Circuit Working:
Pin details of the gas sensor module are shown in Fig. 2.
An MQ-6 gas sensor is used in the gas sensor module. As
per its datasheet, it 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. Whenever there is LPG con-
centration 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 resis-tors 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.