MiCS-6814 Sensor seems able to read NO2 value only

[aldoagosta]

Hi,

it seems that sensor (Grove version of MiCS-6814) does not read concentrations other than NO2.
NO2 is the only value changing over time while NH3 stands still even with a bottle of Ammonia placed below. By the way putting the ammonia bottle beside the sensor NO2 level decrease while NH3 stands still as said above.

The sensor is connected to a I2C port on arduino one Rev. 3 board thru Base Shield 2.

Thank you for support.
Regards

Aldo

[empierre]

Hello,

NO2 is sensitive yes:

For CO, I have 0 or 1 if I can say:

for NH3 this is also 0 or 1 but rarely...

I guess this should be reported to Seed that sells the board since you tested it with NH3 reference I don't have:
http://www.seeedstudio.com/depot/Grove-Multichannel-Gas-Sensor-p-2502.html

[empierre]

going back to the base sketch I have this:

The concentration of NH3 is 0.99 ppm
The concentration of CO is 1.20 ppm
The concentration of NO2 is 0.03 ppm

and you ?

[aldoagosta]

Hi Emmanuel, same CO (1.20 ppm) and NH3 (0.99 ppm) values here. NO2 is active, I confirm!

Going to put a tech request to seedstudio as for you suggestion.

Thank you!

Aldo
Il 28/Feb/2016 11:24, "Emmanuel" notifications@github.com ha scritto:

going back to the base sketch I have this:

The concentration of NH3 is 0.99 ppm
The concentration of CO is 1.20 ppm
The concentration of NO2 is 0.03 ppm

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#15 (comment).

[aldoagosta]

I wrote to seedstudio as well as to Arduino sketch father :-)
Seeed-Studio/Mutichannel_Gas_Sensor#4

Sensor Manufacturer specifies how to read values here (no matter if the models listed are different):
https://www.cdiweb.com/datasheets/e2v/Load%20resistance%20for%20MiCS%20sensors%20measurements.pdf

I guess there's something wrong in Grove firmware...

Bye Aldo

[empierre]

Great !

It seems it is out of stock, hope they have not dropped it off due to those issues ?

[aldoagosta]

Next try is to write firmware since the beginning. I never wrote a row in my life... but I would start from here:

http://it.mathworks.com/help/supportpkg/arduino/examples/read-temperature-from-an-i2c-based-sensor-using-arduino-hardware.html?s_tid=gn_loc_drop#zmw57dd0e2073

[ericltongfb]

has anyone gotten any word back from seeedstudio about the lack of responsiveness of the other gas channels?

[aldoagosta]

No!

Aldo Agosta
Il 19/Apr/2016 15:20, "ericltongfb" notifications@github.com ha scritto:

has anyone gotten any word back from seeedstudio about the lack of
responsiveness of the other gas channels?

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#15 (comment)

[ericltongfb]

seems silly that they are selling a sensor for $40 that only records one gas :/

[epillar]

I am having a ton of problems getting this sensor to work and now I know why. Does anyone know if the CO channel works? Does anyone know if they are going to release a firmware update for this board?

[aldoagosta]

Someone tried with CO but it seems it does not work as expected.

I have no news from seedstudio on how and if they will solve the issue. I
think they will not since they do not sell the sensor anymore!

Good luck!

Aldo
Il 27/Apr/2016 17:39, "epillar" notifications@github.com ha scritto:

I am having a ton of problems getting this sensor to work and now I know
why. Does anyone know if the CO channel works? Does anyone know if they are
going to release a firmware update for this board?

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#15 (comment)

[epillar]

Well dang. I wonder if I desoldered the chip from the board and put it on the protoboard directly if all 3 channels would work.