Control an Xbox 360 controller analog stick

Using Arduino General Electronics
2

a few points.

  1. using analog write for a value of 127 is a duty cycle of 50%. NOT the same as the middle of a pot.

  2. the voltage into the pot absolutly makes a difference in what you need to make your controller work.

  3. a digital pot induces much less noise and a smoother transition than you will see with filtered pwm.

the controller processor is expecting a voltage sweep from 0 volts to 1.5 volts according to your information so the sweeper of the pot should sit at .75 at null. the best way to do this ,that I know of, is a digital pot.

I know a guy who got a wiimote to work with his xbox 360 using this method and he said it was very
smooth with the digital pot using the tap in method you are describing.

digital pot at sparkfun