Microstepping with arduino Moderators: adafruit_support_bill, adafruit

[nekodrugi99]

Is it possible to use microstepping with stepper motor and arduino?

[adafruit]

yes. actually i got this working but i havent posted it. needs a little more tweaking.

[mewControl]

Cool, maybe I will hold off my little project and work on something else while the new stepper code is...errr...distilled.

Are you taking into consideration acceleration, or are you providing primitives and leaving that as an exercise to the higher level implementer? If it is step and direction, I imagine it is the later.

Microstepping is great for low and medium speeds with benefits going away after that, but getting to the "after that" portion of the curve or even through the mid-band can sometimes require a trajectory planned around an acceleration curve.


Thanks.

[adafruit]

the library will only have low level microstepping. the 'computer control' part is up to you :)

[macegr]

I used the following single-page algorithm in an ATmega to implement precise ramped acceleration; works very smoothly: http://hwml.com/LeibRamp.pdf

[mewControl]

I used the following single-page algorithm in an ATmega to implement precise ramped acceleration; works very smoothly: http://hwml.com/LeibRamp.pdf

That's good stuff.

Is HWML yours? Very cool piece of hardware. This is an unimportant digression, but the command set does not appear to offer a means of setting backlash which means some error may exist depending upon the machine of course.

[macegr]

HWML is not mine. The LeibRamp.pdf has been floating around for a few years. You might even find a scanned copy of the original document.

Anyway, it's a good algorithm. It requires floating point calculations, but if you attempt to do the same thing with only integer math, it will require just as many CPU cycles.