in this TUTORIAL, I am going to build an LPG detector with alarm.

Step 1:

An LPG gas sensor is one kind of device which is used to sense the presence of an LPG gas leak in the home, cars, storage tanks. This sensor is attached to an alarm circuit to give an alert to the peoples through a buzzer sound in the area where the gas leak is occurring.

Step 2: How Does Mq2 Gas Sensor Work?

every mq2 sensor is made with a heating element and it is coated with some chemicals that are responsible for the detection of gasses Sensitive material of MQ-2 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas exists, The sensor’s conductivity is higher along with the gas concentration rising. Please use simple electro circuit, Convert change of conductivity to correspond output signal of gas concentration. MQ-2 gas sensor has a high sensitivity to LPG, Propane and Hydrogen, also could be used to Methane and other combustible steam, it is with low cost and suitable for different application. MQ2 gas sensor is an electronic sensor used for sensing the concentration of gases in the air such as LPG, propane, methane, hydrogen, alcohol, smoke and carbon monoxide. ... Concentrations of gas in the gas is measured using a voltage divider network present in the sensor. This sensor works on 5V DC voltage. MQ2 Gas sensor works on 5V DC and draws around 800mW. It can detect LPG, Smoke, Alcohol, Propane, Hydrogen, Methane and Carbon Monoxide concentrations anywhere from 200 to 10000ppm.