Thanks for the reply - a winter project I think

@daniele You may need to create a dummy sensor and update sensor value everyday night via a script.

@jkandasa OHHHH wonderfull !!! I will try this ! Many thanks !

@jkandasa Just tested and it works like a charm!!! Really great examples, that are easy to implement. Mycontroller was already great, now it is even better!!. Thank you!!

@rjad Ok,I tested this but couldn't get it to work. Presumably I didn't follow the instructions properly. When you do changes on HTML additional headers, you have to reload the browser. I hope you did this. With some work it could be better, so for example, I lose the hover information, I had trouble getting two of these plots on one dashboard with different bins. For hover information, I do nit get any clue. As I never worked directly with the D3 chart. For the multiple of charts on same dashboard issue, you might have chart id issue. Maybe because of this one, <canvas id="simpled3" style="display: none;"></canvas>

@fsgrazzutti Great catch! Thanks.