Hi Henrik,

The thought behind not using the index channel is:
After firmly attaching the base...
You will probe anywhere in 3d space, then click the "zero" button on the stylus.
At that point, all encoder rotations will be based from that point.
Logging 3d points will be performed by clicking the "log point" button on the stylus.
I'm hoping to have a routine to log points as fast as serially possible while holding the "log point" button down continuously.
The way I see it, this will be all variant on:
1) "slave" pic interrupt speed to acquire an accurate count
2) "slave" pic to "master" pic serial speed
3) "master" pic to pc serial speed

All of the above will hinge on the user's stylus "drag speed" across the intended surface.

Check out this link...maybe it will explain it a bit better than I can



Let me know whatcha think.

Thanks,
Chris