So my polargraph is up and running,
I have used a Arduino Mega ADK
I have Adafruit motor shield
and Nema 17 steppers.
I have been using the latest firmware and controller found on the website and where sandy pointed me to.
So my motors takes my pen up down left and right like a dream! i love it and it returns home with in 2-4mm of the last position which is awesome.
BUT and this is a big but when i set the page to a particular size (A4) the gondola moves WAY beyond the measurements of an A4 page.. it almost moves 2x further than its meant too..
the moves are drastic...
So i have the mm per rev set to 100mm as my spool is 100mm round.
the steps are 400,
and the multiplier is currently on 8, it was there when i started the app.. i did change it to 1 at one stage but it did crazy things when i did so.
I am not sure what the multiplier does so i left it as 8.
i changed all the paper sizes etc.. but it seems to just go SOOOO far past the page its not funny..
HELP what am i missing Sandy..