I wanna use another data series instead of time stamps where plotting. Is it possible?
Do you mean that you want a value vs value instead of a value vs time plot?
If so, using the timestamp at one of the values won’t work. Aside from the fact that you can only have one value per timestamp, all of the off-the-shelf plotting widgets will display values from recent history so unless your secondary value happens to be a unix timestamp from recent history you won’t see anything in the plots.
You could accomplish this with a custom widget. Unfortunately we don’t have any examples of plotting data in an X-Y plot, but check out the timeseries style example here: https://github.com/exosite-garage/custom_widget_scripts/tree/master/line_graphs/line_graph_using_flot as well as some of the examples from the Flot library (what that custom widget uses for plotting) here: http://www.flotcharts.org/flot/examples/
Firstly, thank you very much your instant answer. I mean, I want to plotting for example humidity vs temp. I dont want using time stamps as x or y axis.