Gas Sensor Module - the killer feature

Archive
21

bags not working in an area where MQ-138 is necessary !

22

Sounds like it would nice to have the option to order a GasSense w/o the M-3 sensor. Sounds like youā€™re going to end up with a pile of them.

23

That would be nice, or to be able to order it with different sensors would also help. I did order multiples of each sensor so I can include testing variances between sensors. I know they are cheap sensors but Iā€™m rather interested in finding out how good they are. For example a Gadgeteer version of the environmental egg, might be what is needed as they seem to be a tad stuck or otherwise having some problems getting out the door, so add NO2 and radiation modules and I can do anything they can do (and more), but better and easier. Gadgeteer is simply an incredible tool.

24

@ Duke Nukem - Hi Dukeļ¼If you need those sensors MQ-2/3/4/5/6/7/8/9ā€¦please contact with me. We are original manufacturer of the sensors.
If have any questions about the sensors, pls feel free to contact with me. Our website:www.winsensor.com
email: sales@ winsensor.com

25

I wish I would have gotten your message 2 weeks ago as I already have a bunch on their way here. Perhaps you can help with with some calibration equations, so we can make these sensors a little bit more appealing.

26

First shipment of gas sensor arrived today so now testing can start with:

MQ-135 Air Quality Sensor
MQ-136 H2S Gas Sensor
MQ-137 Ammonia Gas Sensor
MQ-138 Formaldehyde Gas Sensor
MQ-139 Freon Gas Sensor

27

How do you test the 137, 138 and 139 sensors without killing yourself?

I guess you could use a household cleanser for 137, and a little Formaldehyde for 138.

28

MQ-139 Looking to buy an old fridge :slight_smile:

Iā€™m hoping that Lucky (above) can give me a hand at putting together some curve fit equations so we can at least put some values on the readings.

29

Dear Duke Nukem

Could you give me a website where you order the MQ sensors?
Thanks

And could GHI sell the Gas Sensor Module without sensor?
I

30

I have just buy 3 modules.
could the MQ-7 can be used in this module?
https://www.sparkfun.com/products/9403

31

I bought my gas sensor from a couple of vendors in China via Alibaba.com and typically I got a couple of each sensor for testing etc.

If you were looking at a MQ-9 for CO detection, this setup wonā€™t work as the MQ-9 needs 1.5v across its heater for CO detection (ie When 5v, it detects CH4, while 1.5v detects CO)

Iā€™ve been looking at the ME3 Gas Sensors and so perhaps one day there will be a module for those, but be aware the ME3 series of gas sensor are more expensive (ie $30 or more and up).

Send Lucky Liu <sales@ winsensor.com> an email and mention you learned about their sensors here and maybe you can get a deal as she has been very helpful in some discussions Iā€™ve had with her concerning different sensors.

32

Thanks,How about new MQ7, is it suitable for this module?

33

Ok now I know the GHIā€™s module canā€™t use MQ7
I find useful
http://thesis.jmsaavedra.com/prototypes/technology/mq-7-carbon-monoxide-sensor-breakout/