Trying to use variable outside of the main weather record in the alarm.py example

[Rahul Bedi]

Hi,

I am trying to use the "examples/alarm.py" example in weewx 4.1.1 to send me an email but instead of using the main weather record fields in the expression eg. rainRate etc.. I would like to use fields from the purpleair service but the expression is unable to eval them as they don't exist in the record being passed to the "new_archive_record()" function.

Any idea how I could refer to those ?

Thanks.

- Rahul

[Tom Keffer]

I guess I don't understand. If the Purple Air fields are not in the record, where are they?

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[Rahul Bedi]

The expression I am trying to eval is:

"(pm2_5_cf_1 > 0)"

and the error is get is:

"weewxd: alarm: name 'pm2_5_cf_1' is not defined"

When I print it, here is what the record contains:

Record:
{'heatindex': 82.0, 'altimeter': 27.113450189583336, 'outHumidity': 56.4, 'humidex': 90.06778137338245, 'ET': None, 'rainBatteryStatus': 0.0, 'rainFault': 0.0, 'uvFault': 0.0, 'rainRate': 0.0, 'outTempBatteryStatus': 0.0, 'rain24': 0.0, 'inHeatindex': 28.333333333333343, 'inDewpoint': 62.24454757159945, 'hourRain': 0.0, 'inTemp': 82.20137931034483, 'barometer': 30.003354552125, 'windchill': None, 'dewpoint': 63.195132514044566, 'windrun': 0.44117464302136283, 'rain': 0.0, 'maxSolarRad': None, 'pressure': 27.113450189583336, 'windGustDir': 247.5, 'rainTotal': 20.6502, 'clockUnsynchronized': 0.0, 'forecastIcon': 2.0, 'usUnits': 1, 'appTemp': 81.67662896111341, 'windBatteryStatus': 0.0, 'interval': 5, 'dateTime': 1598108100, 'windDir': 257.4427276349679, 'outTemp': 80.13199999999999, 'windSpeed': 5.294095716256354, 'inHumidity': 51.0, 'outTempFault': 0.0, 'windGust': 17.000758074738712, 'uvBatteryStatus': 0.0, 'windFault': 0.0, 'cloudbase': 6765.2880649898725} 

None of the purple air fields are in it. Purpleair service does use a different binding and database to store its values, so not sure if that has some bearing.

- Rahul

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[Rahul Bedi]

It appears that I might have to actually read the last record from the purpleair DB as the default record passed to the new_archive_record() handler in alarm.py is referring to the main weather station record only.

Any tips on how to do the equivalent the following from the skin template within the alarm.py code:

"$current($data_binding='aqi_binding').aqi_pm2_5"

Thx.

- Rahul

[Tom Keffer]

You should really set the alarm in whatever program is sourcing pm2_5_cf_1. 

The alarm extension works by examining the record after it has been processed by the engine's pipeline. If something is not in the pipeline, it's not going to be aware of it.

I suppose you could write a custom alarm that does a database lookup and sounds an alarm on the basis of that. Little odd, but it would work. In any case, that's not the way alarm.py works.

-tk

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