we have a motor which has three wire 1. input 2.Ground 3. PWM.
which operating voltage is 12v. and current is 0.33A
PWM voltage is Up to 7V.
I wanted to start it with push button.
How to design a controller for it?
Hello visara975
Welcome to the best Arduino forum ever 
Post your sketch, well formated, with well-tempered comments and in so called code tags "< code >" and a detailed circuit diagram to see how we can help.
Are you sure the third wire is a PWM input.
With a three-wire (computer) fan, the third wire is usually a tach output.
Leo..
Your topic does not indicate a problem with IDE 2.x and hence has been moved to a more suitable location on the forum.
Not much for a controller to do!
When would the fan stop?
Would it's speed be controlled, and by what?