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 a…

MQ135 Air Quality Sensor issues

system October 16, 2012, 10:39pm 2

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.

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MQ135 Air Quality Sensor issues

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