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Seeed-Studio / Mutichannel_Gas_Sensor

This Arduino library is used for driving "Xadow - Mutichannel Gas Sensor" and "Grove - Mutichanel Gas Sensor"
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Sensor seems able to read NO2 value only #4

Closed aldoagosta closed 1 month ago

aldoagosta commented 8 years ago

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 and this seems to be coherent with manufacturer instructions here: https://www.cdiweb.com/datasheets/e2v/AN172_Useandperform.pdf Depending on the kind of gas the resistance goes higher of lower. So with NH3 the NO2 goes down but the strange thing is that NH3 value stands still. Therefore the variance in resistance should not update NO2 Value but instead it should change the other gases depending on the variance range.

See the doc hereafterwhere the sensor manufacturer specifies how to calculate values from sensor (does not matter if the models listed are different): https://www.cdiweb.com/datasheets/e2v/Load%20resistance%20for%20MiCS%20sensors%20measurements.pdf

Moreover, also empierre found identical values and we live in different countries: https://github.com/empierre/arduino/issues/15#issuecomment-189833091

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 commented 7 years ago

I am waiting too for an answer or is this sensor crap ?

ghost commented 7 years ago

There're 3 independent channel for the sensor MiCS-6814, RED sensor, OX sensor as well as NH3 sensor. Please refer to this datasheet. Thanks.