Managing a boolean variable with weewx

[Remy Lavabre]

Good morning,
A "simple" question (apparently): I have a boolean type variable in my WeeWX database (ON/Off state).
Is it possible to show this state in a diagram? For example, draw the curve of an indoor temperature and at the same time on the graph the "ON" or "OFF" state of the Boolean variable?
If yes, how... ?? ;-)
Thank you so much...

[Tom Keffer]

Unfortunately, the plotting library in WeeWX is capable of using only one y-axis scale. A limitation, to be sure.

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[Remy LAVABRE]

OK thanks. but would you have an idea about visualizing the on/off state on a graph? Is it better to record the values ​​0 and 1 instead of true false to ultimately visualize this data in a graph?

Thank you Tom

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[Tom Keffer]

You could create such a variable. Say your boolean value is "heater". Then put in [[Corrections]]

heater_value = 1 if heater else 0

Then plot "heater_value".

If you really want it in the same plot as inside temperature, but you don't care what the actual value is, you could do something like

    heater_value = 69 if heater else 68

This is assuming US Units. Then you could plot inTemp and heater_value together.

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[Remy Lavabre]

Thank you Tom for this suggestion which I will follow...

One last quick question:

- My boolean variable in the weewx.sdb database is heater -> OK
- For example, I add a "heater_value" variable in the [[Corrections]] section of the weewx.conf file -> OK

My question: Should I declare the "heater_value" variable elsewhere to be able to use it in the graphics or is that enough?

Thanks Tom for your idea! ;-)

[michael.k...@gmx.at]

Two other thoughts:

1. Use a skin that supports charts with multiple y-Axis.

2. I don't know if this is manageable with weewx currently: make the chart show a different background color, when the variable is true/false. Just like the day/night background.