Add support for particles...

[tyeth]

There is a PM2.5 sensor as part of wippersnapper, and wippersnapper have listed the following relevant supported sensor types (although the _env variants seem unimplemented):
"pm10-std"
"pm25-std"
"pm100-std"
"pm10-env"
"pm25-env"
"pm100-env"

I plan to add the Sensirion SEN55, which has particle sensing at 0.5, 1, 2.5, 4, and 10 (micron?) in particles per cm3, and for all except <0.5um there are readings in ug/m3 (SI unit?), along with Temp(c)/Humidity(%RH), a Voc index and Nox index both without units. I assume the nox and voc are irrelevant as the device doesn't offer units but an "index".

The wippersnapper adding a sensor guide says to file an issue here for unsupported sensor types.
https://learn.adafruit.com/how-to-add-a-new-component-to-adafruit-io-wippersnapper/adding-an-i2c-component-driver#:~:text=NOTE%20%2D%20If%20you%27re%20adding%20a%20sensor%20that%20does%20not%20yet%20have%20a%20predefined%20sensor_type%2C%20please%20add%20a%20new%20issue%20to%20Adafruit_Sensor.

I guess I'm filing an issue to get support for count(#)/cm3 as that seems to be the preferred SI unit. I do commonly see a converted ug/m3 so anyone's input here would be good. I'd love support for the pm05 pm10 pm25 pm40 and pm100 too.

[brentru]

count(#)/cm3 works, is there a shorthand term (how the library would refer to this) for this measurement type?

[brentru]

I'm also game for supporting the PM sizes too

[tyeth]

count(#)/cm3 works, is there a shorthand term (how the library would refer to this) for this measurement type?

In the header file their calling it #/cm3

[brentru]

@tyeth Do we still need this measurement type?

[tyeth]

I don't know if its useful or not to citizen scientists. It's the raw counts in each collector bin, instead of an extrapolated SI unit (has algorithm applied too).

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On Fri, 3 Mar 2023, 15:39 Brent Rubell, ***@***.***> wrote: @tyeth <https://github.com/tyeth> Do we still need this measurement type? — Reply to this email directly, view it on GitHub <#40 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABTBZ46QTHE7JMPCVY4CEYTW2IGEXANCNFSM6AAAAAASYK3654> . You are receiving this because you were mentioned.Message ID: ***@***.***>