MQ-7

Development Boards Arduino
1

Hi,

I am trying to wire MQ-7 (http://www.sgbotic.com/products/datashe … s/MQ-7.pdf) with Arduino but it doesn’t seem to be working.

Please help me with hardware and code.

Thanks

Z

2

a suggestion, tell us what you have done first. I doubt people want to stumble around in the dark trying to help.

3

Thanks Philba.

I have connected sensor based on tutorial http://wiring.org.co/learning/basics/ai … mq135.html

And using similar code we see on the webpage.

This way I am only supplying 5V to sensor for 60 secs but according to manual I posted above suggests to supply 1.4 V to read analog output.

This 5V for 60 seconds is only to ‘purge’ sensors - in other words, to clear the effect of last measured CO concentration. During 90 secs of 1.4 V supply sensor is supposed to be read on analog pin.

My problem is how can I set Arduino to supply 5V and 1.4 V in a cycle for different time?

Thanks.

Best,