Go Down

Topic: MQ135 Air Quality Sensor issues (Read 1 time) previous topic - next topic


Hello there

I've bought this sensor, I've just used it, I've read online, it says 48 of preheat. I have just used it

and what I read is a negative voltage that fluctuates to postive voltage in mV. I noticed that this voltage increases

as smoke increases but it is not stable, it goes to negative and back to postive.

Anyone here used it ? what's wrong? I think the wiring is correct.



I just figured out that it was not connected to the 5V.. When I connected it, the output gave about 3.5V and then started to decrease. it is decreasing and it reached 2.93V now.

Go Up

Please enter a valid email to subscribe

Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

via Egeo 16
Torino, 10131