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Simple Gas Leak Detector Circuit

2015-01-12 02:55  
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Here is the gasleakagecircuituses the SEN-1327 gassensormodule. Its output goes high when the gas level reaches or exceeds certain point. Interfacing with thesensormoduleis done through a 4-pin SIP header.

Pin details of the gassensormoduleare shown in bellow picture An MQ-6 gassensoris used in the gassensormodule. Thesensorcan also be used to detect combustible gases, especially methane.
Whenever there is LPG concentration of 1000 ppm (parts per million) in the area, the OUT pin of thesensormodulegoes high.  The multivibrator basically works as a tone generator. This signal drives timer IC 555, which is wired as an astable multivibrator.

Output pin 3 of IC 555 is connected to LED1 and speaker-driver transistor SL100 through current-limiting resistors R5 and R4, respectively. LED1 ON and the alarm sounds to alert the user of gasleakage. The pitch of the tone can be changed by varying preset VR1. Use a suitable heat-sink for transistor SL100.

1335819320602 Simple Gas Leak Detector Circuit

1335819375102 Simple Gas Leak Detector Circuit

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