@urban said in Driving micro steppers with DuetWiFi:
OK, thank you!
Hmm, would it work to connect a stepper with similar inductance (4.7mH) in parallel to start with?
Yes.
I was hoping to get away without doing that, but there are some sticks that are made for low voltage, like 5V, that could be used.
A standard stepstick run from 24V should work, as long as you can adjust the pot to get a low enough current.
Can you please expand on why full step mode is better.
Normally, the driver uses chopping to regulate the current in the stepper motor coils. This relies on the stepper motor being predominantly inductive. With the large value series resistors, the load will be more resistive than inductive, so chopping won't work. However, in full step mode it doesn't need to work, all the driver needs to be able to do is turn each phase on or off. You would set the stepper current to a larger value than the drivers can provide via the resistors, so that the chopper wouldn't operate.
The chip on the duetWiFi doesn't have Trinamic StealthChop, but would that mode improve the capability to use micro steppers?
StealthChop doesn't work well at the bottom end of the current range, so again it would be necessary to increase the values of the sense resistors.
