Gerhard Reithofer  wrote:
> as this is Raspberry newsgroup I would also be interested which
> controller you use for these steppers.
>
> There are simple and cheap controllers for servos (e.g. a 16-channel
> conroller for ca. $10) and I think it is far more expensive to use
> steppers for several axes, like a robot arm (6 axis).
>
> And how do you program the stepper controllers?

The stepper motor controllers like this one:
https://www.ebay.co.uk/itm/4-Channel-HG7881-DC-2-5-12V-Stepper-Motor-Driver-Con
troller-Board-for-Arduino/292584679609
typically use a few GPIOs for STEP, DIRECTION and so on.

The CNC folks typically have multi axis stepper controllers with support for
limit switches, spindle control etc:
https://www.ebay.co.uk/itm/3D-Printer-Kit-for-Arduino-CNC-Shield-V4-Nano-3-0-A4
988-Driver-GRBL-Compatible/152897481604

There's a variety of firmware for running such controllers on Arduino and
similar, doing closed loop control.

Theo

--- SoupGate-Win32 v1.05