Hey everyone. I'm having a bit of a brain freeze over how to tell Weewx what units (metric or US) to expect when importing a temperature figure from a text file. My set up uses Weewx version 3.9.2 running under Python2 (setup.py install method) on a Raspberry Pi 4, OS is Raspian Buster (Debian 10)
I have two data sources at the moment: The main weather station is an Aercus Instruments Weathersleuth which is basically a fine offset observer. That uses the Intercepter plugin /home/weewx/bin/user/interceptor.py I also have two extra sensors feeding from another pi on the network using the One Wire (OWFS) plugin /home/weewx/bin/user/owfs.py - these are mapped as extraTemp1 & 2 and report as Greenhouse and Garage temperatures. As far as I'm aware all of those report the temperature as metric when polled by weewx and I don't recall having to modify anything. What I want to do is map a third, extraTemp3, to data from a Temper USB temperature sensor I've got in the cupboard where the Raspberry Pi sits (the one running Weewx) All well and good, i've installed a python application which when called will report the temperature from the Temper. > temper-poll Found 1 devices Device #0: 39.7°C 103.4°F I'm sure I can write a bash script to run temper-poll, strip out unwanted data, and overwrite the result to a file in /tmp/ (such as cupboard.txt) - once happy I'll set up a cron for the script and then a service in /home/weewx/bin/user as per the example: https://github.com/weewx/weewx/wiki/add-sensor - modifying as needed. As per notes within weewx.conf [StdConvert] has always remained as US units. What I can't figure out is how Weeex knows whether the incoming data, from any of the sensors across the system, are metric or US? is it specified within the service(s) themselves? I notice further down in the example of adding an extra sensor:: That is, whatever unit system you use in pond.txt, must match the unit system used by the incoming record. The unit system used by the incoming record will be given by event.record['usUnits'] Does that mean I need to add the above to my new service? In short: Both Interceptor and Owfs are presenting temperature data in degrees C, but the Weewx [stdConvert] is untouched from default (US) My reports are in metric, but of course that's just the reports. I could change it at any time without affecting the database or the incoming sensor data to Weewx. Do I need to do anything to my new service in /weewx/bin/user/ to specify that the data is metric or US depending on what value gets presented from /tmp/cupboard.txt ? I'm reluctant to just try it as I don't want incorrect data, even though this is just so I an easily see the temperature of the cupboard where my main "server" raspberry pi, router, network switch and a few other bits of kit reside. Ignore the alarmingly high temp as the stick is currently plugged directly into the pi and its a hot day here - a USB extension cable will give a more accurate reading of the ambient temp. Thanks for any help and guidance and of course apologies in advance if it's in the instructions (I did try a search - honest!) Regards Ashley -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/20ca2276-ca92-4d98-aa20-9d0cc78114d9o%40googlegroups.com.
