Hello, I am trying to configure smoothieboard 1.1 for a cnc style shapeoko, with two motors on the axis and in the documentation I find the way to do it using the drivers of the board using jumpers in the pins step, dir, in, of the two controllers . But I do not understand how to duplicate the outputs for the external controllers. Someone would tell me what changes should I make ??
Thank you very much! sorry for my bad English.
Imported from wikidot
You just wire the two external drivers together ( “in parralel” ) to the smoothieboard step/dir port. Very simple.
Ok, I thought that but I was not sure, when I read that smothieboard only deliver 4mA per pin, the drivers I’m going to occupy are DQ542MA.
Greetings, thank you very much!
Hello, I have the same problem ( 2Z axis with M542H driver ) ,
I suppose in open drain configuration, the needed current will go trough the output transistor?
So, in 3.3V, the current will be 3.8mA per driver.
That means 7.6mA for one output. I don’t want to try.
Am I in a bad way for the understanding of the problem?
What about Themagooz, you discovered something else about our problem ?? I’m still not sure how to connect in parallel.
No one knows how it could be done by software? I have X4 and if I connected one in parallel, I would have 1, it would be very complicated using software to duplicate the axis and for that leftover output?
Or are we both wrong with the subject of the maximum current of delivery of those pins?
After reading the datasheet of the NXP , I’ve decided to try.
My conclusion: 2 external drivers wired on one output work fine.
Don’t forget to parametrize the 3 outputs in open-drain mode and the en pin in inverted mode ( for my case )
alpha_step_pin 2.0o # Pin for alpha stepper step signal
alpha_dir_pin 0.5o # Pin for alpha stepper direction, add ‘!’ to reverse direction
alpha_en_pin 0.4!o # Pin for alpha enable pin
alpha_current 1.5 # X stepper motor current
alpha_max_rate 4200.0 # Maximum rate in mm/min
Okay, so let’s go like this! thank you very much!