Arduino mini CNC plotter4-2

The firmware on the GRBL-28BYJ-48 didn't reverse the movement of the Y axis, so I only flipped the left and right sides of the parts involved. It just flips the picture I'm drawing upside down. I didn't like it, so I fixed it. The assembly is the same as the original remix.

https://denshiman.com/Arduino_mini_CNC_plotter.html
https://denshiman.com/cnc.html

After I wrote this, I found out that the firmware can support this, so I can flip the Y axis there as well. After all, flipping the Y-axis motor [$3=2]
Because the command didn't work.

https://github.com/imaicom/GRBL-28byj-48/