Baby Stepping Hardware Button

nhof

@supraguy Yes, if you are babystepping "manually" using this sort of macro (or a user defined one on the web interface) you can just type in the value for the M290 command for incremental steps. I think the latest PanelDue firmware actually adjusts in 0.02mm increments now which is pretty nice.

For the question about activation, if you are using two different endstops it would not cause any issue if one switch NO and the other is NC. You can set up each independently of the other.

Please keep in mind that this entire way of doing things is kind of "hackish" but should work fine.

Torro

Hi,

I like this idea. One question, can i use only one ground for both Buttons? I have a lot 3 wire cables and connectors. Would it make easier for me

Thanks!

dc42

@torro said in Baby Stepping Hardware Button:

Hi,

I like this idea. One question, can i use only one ground for both Buttons? I have a lot 3 wire cables and connectors. Would it make easier for me

Thanks!

Yes, buttons connected to different endstop inputs can use a common ground wire.

Torro

Thanks again!

Torro

Has someone noticed problems with "button bouncing" ?
increasing is fine, when i push "decrease", baby stepping decreases 2 or 3 times the programmed value.

there are some possibilities with small circuits and arduino seems to have a library for this problem.

is there a solution in the firmware?

SupraGuy

I was a little concerned with debounce, but that hasn't been a problem for me -- at least I haven't NOTICED a problem, which amounts to the same thing.

IIRC, this is looking for falling edge, so a small capacitor across the button wiring would work to debounce your button, at a cost of slightly slower response. Fast response is more important for mechanical/electronic things, but can be tolerated for most manual operation like this.

Depending on what you're using, it might be better to just get better buttons/switches.

Torro

I tried 3 different types of Buttons...
i'll try a capacitor. How small do you think should it be?

dc42

There is already a hardware debounce circuit on the 5 endstop inputs on the Duet, but not on the ones on the expansion connector or CONN_LCD. Which inputs at you using?

Torro

E0 and E1.

I think the Buttons are sh*t, when there is a debouncing included...

Torro

I found the problem. The Buttons i tried, are big ones for 230V AC and 10-16 Amps.

Today, i found some for 12V and 0.05amps. They work like a charm. I only had to solder a small circuit Board to mount them.