Dash rheostat

Yes, there is an input for Screen Brightness that can be used to adjust. It works on standard Android devices, but unfortunately some heavily hacked devices like headunits do to use standard Android screen brightness.

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Hi there, has any one been able to generate PWM with the 2 way demo sketch using one of the dedicated pins!

You can try using an app called macrodroid to adjust brightness of android device based on time of day.