Mq2 Gas Sensor Circuit Diagram. When we turn on the system s power supply at the same time the mq2 gas sensor starts to sense the smoke level in the air and it gives the output value to the arduino. The mq series of gas sensors use a small heater inside with an electro chemical sensor.
How to use mq2 gas sensor arduino tutorial. On the other side one terminal is pulled to the ground via a 470k ohm resistor and the middle pin is connected to the ground. A gas sensor circuit is as shown it contains an mq2 gas sensor lm339 opamp ic led lights and a buzzer.
Selecting between sensor type and module type.
This circuit triggers the buzzer when smoke level becomes higher than 1000 ppm this threshold value can be changed in the code according to the requirement. This circuit triggers the buzzer when smoke level becomes higher than 1000 ppm this threshold value can be changed in the code according to the requirement. This circuit mainly uses mq2 smoke gas sensor and arduino to detect and calculate the level of smoke. A gas sensor circuit is as shown it contains an mq2 gas sensor lm339 opamp ic led lights and a buzzer.
