phase space for simple pendulum

[jmnk]

Julien, your program is perfect, but I prefer to use PhyPhox for measuring and to treat saved data using Python.

I attach measured angle..

@solid - that graph of angle vs time - has that been created off-line via Python using the data exported from a phone?  Or have you created an experiment that plots that graph on the phone itself?  If so - would you mind sharing the experiment?