hey @ll 
I don´t have a special hardware in mind. What i mean is the ability to use any hardware you want, without the need of a special programming (arduino or android).
For this, we need some more data types and perhaps sliders and input-fields in the android-app. Then you can define a "analog-data-type" and control even the pwm-outputs of arduino by using the slider on your handy.
And when we could define a bar in the app (which goes from 0-100) it can get its values from any integer from arduino by mapping a sensor. Better: we can tell the data-range for the bar in the app.
Or: it is a text-field which shows var2 or int5 or so.
I hope you understand what i mean!?
Poldi