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RAMPS board pins vs GRBL board pins

Posted by KM6VV 
RAMPS board pins vs GRBL board pins
September 28, 2017 09:59PM
I just got a RAMPS board, and loaded Marlin on the Arduino.

I want to do Laser. Can I switch to GRBL code and (LaserGRBL)? I know the RAMPS is bipolar and the GRBL has (drives) UNIPOLAR. but at the Arduino drive level, the pins could be the same, or maybe a header file can be configured on the GRBL build?

Thanks,
Alan
Re: RAMPS board pins vs GRBL board pins
September 28, 2017 10:37PM
[reprap.org]

Steppers are identical apart from having a centre tap each coil... which can just be ignored.

Marlin speaks a different gcode best to put GRBL firmware on it...

Several people have ported GRBL to ramps... eg [sourceforge.net]
Re: RAMPS board pins vs GRBL board pins
September 28, 2017 11:51PM
That's true, but if they SAY unipolar, I'd think they mean to drive it using a center tap. Most of my bipolar steppers have 4-wires. Not so much about the steppers, but I was wondering about the pins used by the boards.

I did find a GRBL_RAMPS1.4, so looks possible...

Thanks.
Re: RAMPS board pins vs GRBL board pins
September 29, 2017 12:24AM
I dont know where you are seeing this..

I see lots of pleas for UNIPOLAR support and some user saying they have hacked it in...

Every GRBL board Ive ever seem just uses standard a1488 drivers or EasyDriver or TI DRV8811 all of which are bipolar
Re: RAMPS board pins vs GRBL board pins
September 29, 2017 12:30AM
For the RAMPS it comes down to : step, dir, enable.
It doesn't know, what kind of stepper (driver ) it controls. If there is a unipolar driver that suits the pololu-pinout, go ahead and use these 5-wired steppers.
Re: RAMPS board pins vs GRBL board pins
September 29, 2017 12:44PM
I can't find the board now.
That's probably where I got it, from somebody wanting to drive unipolar stepper motors. Although I have several old unipolar steppers (from old disk drives), I don't want to use them!

So do all these board designs tend to use the same processor pins to drive the stepper modules; control heatbed, extruder and fan, as well as limit switch and temp sensor inputs? Between RAMPS and GRBL boards? That's basically what I'm asking.

Edited 1 time(s). Last edit at 09/29/2017 01:12PM by KM6VV.
Re: RAMPS board pins vs GRBL board pins
September 29, 2017 03:50PM
no all the pins change. thus the need for a firmware port to the board.
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