Here is a gas trickle detector route that detects the steam of LPG gas and alerts the user by audio-visual indications. The route operates off a 9V PP3 battery. Zener diode ZD1 is used to modify 9V in to 5V DC to expostulate the gas sensor module.
Pin sum of the gas sensor procedure are shown in Fig. 2. An MQ-6 gas sensor is used in the gas sensor module. The sensor can moreover be used to discover flamable gases, mainly methane.
Whenever there is LPG thoroughness of 1000 ppm (parts per million) in the area, the OUT pin of the sensor procedure goes high. This vigilance drives timer IC 555, that is connected as an astable multivibrator. The multivibrator in essence functions as a tinge generator.
Output pin 3 of IC 555 is connected to LED1 and speaker-driver transistor SL100 by current-limiting resistors R5 and R4, respectively. LED1 glows and the warning sounds to inform the user of gas leakage. The representation of the tinge may be altered by varying preset VR1. Use a fitting heat-sink for transistor SL100.
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