After pre-configuring grbl, time to assemble everything for the first test run. Here is my connection diagram for csCNC. Ref : grbl/wiki
1# assembled everything on board,
2# Added face plates and Grbl reset, Feed/Hold, Cycle/Resume, Power switch, LEDs, USB port and also a back plate with DB-9 connectors for steppers, 12V terminal for spinner, fuse house, limit switches female jacks
3# Installed simple 12V/3A power supply with 220V/12V transformer and 7805 regulator for 5V supply.
4# installed limit switches, wiring everything.
Done! ready for test jogs.