[Grbl_Esp32 Issue#121] 4th port

#1 – bdring 于 2019-04-14

I just completed testing on a design to support the MPCNC machine, but it could be easily adapted to other machines.

It has 5 motor drivers so that there can be (2) each on X and Y. The (2) motors on each axis share a direction pin, but have separate step pins. This means you can do auto squaring on those axes, but you can not use them for a 4th or 5th axis.

I have a few to sell on Tindie later this week, but will have a lot more within a few weeks.

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