[emosms]

Hi,
is there an Arduino GRBL library mod that supports both Z axis with servo and unipolar motor drivers (4 wire uln2003)?

I found a mod library for unipolar motors and another one using standard bipolar motors and servo control for Z axis.

I could eventually blend them but It would take unknown amount of time to find the corresponding mods.

I am building a pcb engraving plotter with 28byj-48 motors and a servo on Z.

I know there is a mod for the motors to turn them bipolar but I think the torque is ok (2 motors per axis) and have to rewire the build for new motor drivers.

[hfjbuis]

The arduino (UNO, Mega) grbl software outputs a step/dir/enable signal. As long as the driver can handle these signals, you are OK. And that is where you get into trouble. Your UNL2003 requires a lot more than just step/dir/enable signals.

Modifying grbl to accept unipolair drivers is a huge project and due to lack of memory, not feasible for an Arduino UNO. I think getting a grbl compatible board/shield and some step stick drivers (TMC2209. DRV8825) would be more feasible.

[emosms]

It works with uln2003 drivers + Z servo:
-https://youtu.be/f6xCfzfiD6Q

This is the library:
-https://github.com/ruizivo/GRBL-28byj-48-Servo

It is a bit tricky if you want to change the stepper motor and servo pwm pins to different ones than these in the library.

And it works with Arduino nano.

I am currently having some strange issue that the video maker does not have (he runs some plotter with Z servo and uln2003 driven motors).