StdCalibrate math question

[Steve2Q]

I have a calibration curve for my outdoor humidity sensor that includes division and an exponent. The formula is : OutHumidity = 92.2/(1+(1/(OutHumididty/64.6)^3.47))  Can this be handled by StdCalibrate?

[Tom Keffer]

Yes, of course. Just substitute "**" for "^" so it's a Python expression. Or, use the math function pow().

On Sun, Jan 21, 2024 at 8:14 AM Steve2Q <ste...@gmail.com> wrote:

I have a calibration curve for my outdoor humidity sensor that includes division and an exponent. The formula is : OutHumidity = 92.2/(1+(1/(OutHumididty/64.6)^3.47))  Can this be handled by StdCalibrate?

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[Graham Eddy]

it is worth noting and perhaps documenting that python builtin functions can be used in StdCalibrate expressions

⊣GE⊢

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[Tom Keffer]

It is documented.

expression is a valid Python expression involving any observation types in the same record, or functions in the math module. 

https://www.weewx.com/docs/5.0/reference/weewx-options/stdcalibrate/#corrections

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