I was not sure which one to post this in, since I have not even reached connecting motors, high voltage, or high current yet. I will be picking up the boards today, and will spend some time analyzing them more. I will post results here. I have the information on this kit. The kit is a Longruner LKB02 3D/CNC kit, available from Amazon at https://www.amazon.com/Longruner-Arduino-Professional-Mechanical-LKB02/dp/B072N4FMRN.
The DRV8825 Carriers seem to be variants of the Pololu boards, with a zero ohm jumper (Rx) added between V3P3OUT and and R1 (Current Adjust). nFAULT is connected to nSLEEP via a 10kohm resistor. The current sense resistors are 0.25ohms.
The Carrier wiring shows VDD connected to nFAULT, which does not allow detecting a fault and may damage that pin in the event of a fault.
This setup is not right as I see it. It works, that is all I can say for it. R4 is in the wrong place, it should be right before the split to R5 and IC Pin 18.
The CNC Shield seems to be a clone of the Protoneer V3.00 board.
