Dave
This probably already exists ...
I am creating a load of little, tiny, trend graphs that plot the last 6hrs of temperature.
[img]
Chart%20Mini%20-%20Trend%20Ensuite.png
[/img]
The grey filled area is the temperature of the hallway, where the thermostat is located.
The red line is the temp of the Ensuite Bathroom.
What I would like to do is place a, dotted/dashed line showing the 'ideal' temp i.e. 20C then at a glance you can see the ideal, whether the heating is hitting target at thermostat (or if thermostat set too high/low) and a specific room is hitting target - along with a trending indicator - temp is going up or down.
I cannot see how to get a static line in there, except to set a variable Target Temp and get Matplotlib to track that static, Ok it looks like I have answered my own question.
Will go an try it
Mike