As this project is using MQ-4 gas sensor as mentioned before,fromr 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.
From the schematic circuit, there have 2 LED which is red and green as a indicator of the circuit. The red LED function as a starter or warm up to make an sensor active. The red LED will blink for a few sec before the LED off and the green LED will turn on that show the sensor already activated and ready to detect any various kind of gases.
When the sensor would detected gases, the buzzer will sound a few second and the wireless alarm will sound as a warning to people at the building or factory or etc.
Here we use 5v dc relay as a switching to make an alarm activated and IC1 LM324 as a amplifier to the circuit. We also used preset resistor 10k to adjust the sensitivity of the sensor and we use 12V adapter as a supply to the circuit
Let watching this video:
As shown above is how the project function when it detect LPG gas.
When the sensor would detected gases, the buzzer will sound a few second and the wireless alarm will sound as a warning to people at the building or factory or etc.
Here we use 5v dc relay as a switching to make an alarm activated and IC1 LM324 as a amplifier to the circuit. We also used preset resistor 10k to adjust the sensitivity of the sensor and we use 12V adapter as a supply to the circuit
Let watching this video:
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