yoo martin, thanks again, as said in my post, i have the stepper
already under control via a ULN2003A driver and a potentiometer.
im stuck in the pd part, no problems with comport or the serial but with the pd patch.
With pduino you can send each bit pattern at once, don't set the pins
one at a time, it's too slow.
So if you get ticking and not continuous motion it usually means that
either your pattern is wrong or that your drive isn't sufficient (not
enough voltage or not using transistors, or transistors not fully on).
If you can show a diagram or photo of your setup I could probably help
you more...