I have a history card for a door sensor. But since openings of the door are only very small lines, its difficult to see. What can I do to recognize when the door has been opened?
If you mean the more-info popup, klick on the header.
You can also use the popup-card or the browser-mod to open more-info popups larger.
You can also create numeric sensor reflecting state of door (e.g. 1 for open and 0 for closed) and use this sensor in history instead. Then graph will be basically flat line at 0 level, but spikes of 1 (when door are opened) are easy to spot.
Ah ok, thanks, this works, but only if I set a unit_of measurement.