I just made a Wiring Diagram for the Control PCB v1.0 board.
You will find the full resolution image & source files at the Github repo.
I want to remind that there is a Google Groups community with 90 members in this right moment where you can ask, share and read about this project! Join us! :)
Check soon my fork of the grbl repo to get the lastest firmware for the ControlPCB board.