Greetings all.
I got the idea in my head that I'd like to use a digipot the way that RAMBo does to control the Vref of my stepper drivers. I understand that a stock Pololu will not work with a digipot, as there is no way to externally set the Vref. However, I've gotten away from Pololu's and now I'm using Panucatt's DRV8825 drivers. The really nice thing about these is that the have a Vref pin on a header, so externally setting the Vref should be possible. So I've made up a board that will accomplish this, along with some other stuff.
board
In addition to the digipot I've gone and integrated SD RAMPS as well as the pinouts necessary for an LCD display with rotary encoder and momentary switch.
And here's the interface board.
board
What do you think? Have I missed anything? Is there something that I should have included or broken out that I didn't?
This is my first foray back to eagle after a long time away, so feel free to be brutally honest.
As far as cost, to get both of the boards made at OSH Park cost about $30, or $10 for a set.
I'm fairly certain that this setup is compatible with marlin with a little modification.
- akhlut
Just remember - Iterate, Iterate, Iterate!
[
myhomelessmind.blogspot.com]
