GAS Sensor Module MQ2 Stand alone System 

In other videos, people are connecting 'Do' signal wire to minus of led & buzzer but u r joining with plus of led & buzzer. Which will work better. Please tell me

How can we use this in industry. Like can we connect 230 volt hooter with any board other than arduino for MQ-137 Sensor

*I tried but when I connect to battery sensor light getting off with in 2 seconds, any body tell why it's getting switch off*

What power supply are you using

Can we use the small buzzer

I used mq 2 sensor after piset when im keeping smoke near it the buzzer is not coming 😢any solution plz plz

I guess 'O' means Out, not Zero. "AO" is Analog Out and "DO" is Digital Out

Great

Is it compulsory to use buzzer?.. Or we can use the sensor without it?

Sir can we give the connections in the breadboard

I assembled circuit as shown in the video It worked well,but in 2 hrs the 9v battery was fully discharged could you please give a solution?

Hello My friend. Can it detect cigarrete smoking?

Sir its not working, the heat is not setting up , i am using 3.7 volt li,lion battery

Buzzer active o pasivo?

Can we use mq5 sensor in place of mq2 sensor

can i use 9v battery?

Thank you sir for the explanation

sir how long should we wait after giving 5v to the MQ3 sensor

fAKE

😂😂😂😂chor