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Connecting external stepper drivers to Smoothieboard

Connecting external stepper drivers to Smoothieboard
June 07, 2016 10:28AM
I am using a 4A NEMA-23 motor in my printer's Y axis. That's too much current for the Smoothieboard to drive directly, so I got a cheap DSP based driver module and made a 32V power supply to drive that motor. Here's how I connected it:




Son of MegaMax 3D printer: [www.instructables.com]
Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]
Re: Connecting external stepper drivers to Smoothieboard
June 12, 2016 09:54AM
Thanks a lot for adding info to the forum like this smiling smiley

If somebody is interrested in wiring external drivers, there is additional information here : [smoothieware.org]
Re: Connecting external stepper drivers to Smoothieboard
July 17, 2016 12:03AM
Your smoothie is running 3.3v logic the driver most likely needs 5 so you need a logic gate or set the pins to ground and connect a 5v PSU to the PUL+ DIR+ and STEP+ i had the same problem with the radds on due which is also a 3.3v logic. I solved that problem using logic level shifters hope this helps.
Re: Connecting external stepper drivers to Smoothieboard
July 17, 2016 12:10AM
Quote
yoyobob19
Your smoothie is running 3.3v logic the driver most likely needs 5 so you need a logic gate or set the pins to ground and connect a 5v PSU to the PUL+ DIR+ and STEP+ i had the same problem with the radds on due which is also a 3.3v logic. I solved that problem using logic level shifters hope this helps.

On a Smoothieboard, you don't need to use level shifters. You just need to configure the pins as open-drain and they'll work as if they were 5V. You can see a wiring diagram and configuration in the link I posted previously.
Re: Connecting external stepper drivers to Smoothieboard
February 02, 2017 11:59AM
My experience was as follows. I bought an external driver that required 5v input. So I set it up as Mr. Wolf described. The external driver worked fine, but the internal driver did not function. So if you are trying to run two motors from one Smoothie driver, it must be 3.3 volts if you intend to use the internal driver for the second motor. Instead I exchanged my external driver for one with enough amperage to run both motors and now I don't need the internal driver.
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