Thanks!
Yeah. I've followed Roy Cortes and Panucatt for a while now. He makes these drivers that have the fault, decay and vref pins broken out on the board. Might as well use them. :)
I saw that post. I've done the exact same thing. I finally got wise and ordered a ceramic slotted screwdriver from amazon. For the price of a stepper driver it's a no-brainer. But if you can set the vref with a digipot it's the way to go.
I've read too many people having ground loop issues, so I added the isolated USB. Made up an isolated FTDI for my GRBL controller, figured I should add it to the RAMPS proto board. Works at 9600 for GRBL, and I tested it out at 250000 with a mega the other day (needs a cap on reset to work though) and was able to connect via pronterface, so it should be OK for the board.
The one thing that has me concerned is the ground planes (I am no expert in this or any field). I've broken them out into a logic plane, a motor plane an a FET plane and then tied them together at a single point. Trying to keep noisy things away from quiet things. Not sure if this is better or worse than a contiguous pour.
Yeah. I've followed Roy Cortes and Panucatt for a while now. He makes these drivers that have the fault, decay and vref pins broken out on the board. Might as well use them. :)
I saw that post. I've done the exact same thing. I finally got wise and ordered a ceramic slotted screwdriver from amazon. For the price of a stepper driver it's a no-brainer. But if you can set the vref with a digipot it's the way to go.
I've read too many people having ground loop issues, so I added the isolated USB. Made up an isolated FTDI for my GRBL controller, figured I should add it to the RAMPS proto board. Works at 9600 for GRBL, and I tested it out at 250000 with a mega the other day (needs a cap on reset to work though) and was able to connect via pronterface, so it should be OK for the board.
The one thing that has me concerned is the ground planes (I am no expert in this or any field). I've broken them out into a logic plane, a motor plane an a FET plane and then tied them together at a single point. Trying to keep noisy things away from quiet things. Not sure if this is better or worse than a contiguous pour.
