I am looking for help from an arduino programmer to complete a timed voltage controller. That is, I have an exercise bike that has an electromagnet to control resistance. I would like to be able to, based on input to the arduino from my iPhone over a wifi/wired network (possibly through a web page hosted on arduino), run one of seven timer based programs on the arduino to provide controlled resistance via voltage regulation to the electromagnet.
first 30 seconds - 7.5 volts 31-60 - 9.0 volts 61-90 - 10.5 volts
and so on.. Followed by a cool down program of, for example, a drop of .2 volts every second. If possible, I would like to do this via pulse with modulation.
Finally, I would like an output of the voltage to be graphed/output to processing or some similar application, preferably the web page (although I am not sure if that part is outside the capabilities of arduino).
I am also open to running this through raspberry pi if that is a more sensible platform.