Air Quality Sensor

[Omemanti]

should be alright right?

[epierre]

@Omemanti cabling is correct

[korttoma]

Hi,
Where can I find AirQuality1.xml?? (or all files related to this device if there are others then the .xml)

01 09/03/14 13:46:53.685 ctrl_chr[31;1mDevice_LuaUPnP::LoadDeviceDoc can't load /etc/cmh-lu//D_AirQuality1.xmlctrl_chr[0m <0x2acc9000>
02 09/03/14 13:46:53.686 ctrl_chr[33;1mJobHandler_LuaUPnP::m_sMissingFile_set /etc/cmh-lu//D_AirQuality1.xmlctrl_chr[0m <0x2acc9000>

Seems like if this file is missing it brakes the whole MySensors plugin.
All devices related to MySensors plugin are blank and nothing seems to update.
Deleting the device that use AirQuality.xml will make the rest work again.

Help!!

[hek]

@korttoma

Unfortunately no one has created it :(

[korttoma]

@hek
ahh, that's why I cant find it... no pressure from my side to get one done but maybe we should mention this little detail on the MySensors building page just as a heads up for others since there is a sketch published and all...

[epierre]

I made a template but I'm unable to test it...

[epierre]

@hek here is an updated list from the Wunder Weather list of reportable gases:

Carbon Monoxide – CO
Carbon Dioxide – CO2
Oxygen – O2
Methane – CH4
Hydrogen – H2
Ammonia – NH3
Isobutane – C4H10
Ethanol – CH3CH2OH (aka C2H5OH or C2H60)
Toluene – C6H5CH3
Hydrogen Sulfide – H2S
Nitrogen Dioxide – NO2
Ozone – O3
Hydrocarbons – VOC
Chlorine CL2
Ammonium NH4
Ethanol CO2H50H
Methyl CH3
Acetone CH3_2CO
LPG (both C3H8 C4H10)

• NO - nitric oxide
• NOX - nitrogen oxides
• NO3 ion (nitrate, not adjusted for ammonium ion) UG/M3
• SO4 ion, sulfate, not adjusted for ammonium ion, UG/M3
• SO2 sulfur dioxide, ppb
• EC (elemental carbon) – PM2.5 UG/M3
• OC (organic carbon, not adjusted for oxygen and hydrogen) – PM2.5 UG/M3
• BC (black carbon at 880 nm) UG/M3
• UV-AETH (second channel of Aethalometer at 370 nm) UG/M3
• PM2.5 mass - UG/M3
• PM10 mass - PM10 mass

[hek]

Thanks!

Still thinking about you gas_type suggestion. It would introduce another level of device types. Hmm..

[epierre]

@korttoma look above to S_CO2Sensor.json D_CO2Sensor.xml D_CO2Sensor.json, if you can test it...

[epierre]

@Yveaux I know you are strong at finding datasheet... can you find one for me ? I can't find the 2SH12 sensor altgough I've asked for it to all suppliers on aliexpress...

Same for theWSP1110

[Yveaux]

@epierre Couldn't find it either, sorry...
I wouldn't buy a $52,- component without a datasheet, if I were you...

[epierre]

@Yveaux When I asked for the WSP110 they sent me only this (not the same for this one is HCHO and well documented...) :

[hek]

@epierre

I wonder what the green curve represents :confused:

[epierre]

@hek that should be the more sensitive, and since it is given mostly for CHCO I guess this is it... (Formaldehyde)

[epierre]

@hek 甲醛 is formaldehyde, given by google translate so I'm right !

[hek]

@epierre

Haha :thumbsup:

[epierre]

Davide answered me, lot of things to read but a warning:

Anyway, for consistent CO2 investigaion, you HAVE to chose a NDIR sensor, those chemical sensor can not be used. They decay in a few year, and they differs a little one from each other.

I've asked him back for precision if he speaks of the organic sensor or the ceramic ones (like MQ...).

For the CO2, it is MH-Z14 which is $66+ priced.

[hek]

@epierre said:

MH-Z14

Like this little puppy?

[epierre]

@hek exact !

[korttoma]

@epierre said:

@korttoma look above to S_CO2Sensor.json D_CO2Sensor.xml D_CO2Sensor.json, if you can test it...

Thanks, found the device files and got the device included again.
Seems like my MQ-2 is always reporting 0 or nothing at all. I guess I need to try to calibrate it again.
It will do the calibration every time the sensor is restarted right?
How can I calibrate the sensor if I put it somewhere where the air is not clean enough? (bring clean air in a jar? ;) )

Maybe it would be an idea to add a calibration button to the mix and when run using the button it would save the calibration related data in the RAM so it can then always use this calibrated value and then it would not re-calibrate every time it loses power.
I have the 10k resistor between GND and A0, is this really necessary?
Does the potentiometer on the sensor board affect the analog out at all or is it only for sensitivity on the digital out?

Sorry for all the questions ;)