A while back I bought a mill. See link for mill pictures:http://www.cnczone.com/forums/bridge...rigid_ram.html.
Since it had encoders attached to the steppers I decided to try and make a DRO. I still need to make a box to put it in.....nothing fancy just a zero function at this time. However I did leave the serial pins open so I can add functions if I decide to later. The main chip is the Atmega328 ( same as the Arduino). The chip is actually programmed with the Arduino Uno. I attached the current code in a text file.