Is it possible to run Polargraph on an Arduino Nano? As far as I can tell, both Uno and Nano are based on an ATmega328. I've been trying to get a1 working on Nano using two a4988 stepper drivers and bipolar modified 28BYJ-48 steppers. I've changed the config in a1 to use this type of stepper driver, as well as changed the pins.
If i connect to a1 using the com monitor It seems that the software is running fine but I don't get any movement on the steppers. I can however move the steppers using a simple sketch with the accelstepper library. Is it possible to manually jog the motors using Gcode or in the controller? Is there any other settings I should modify or will it simply not work on a Nano?

Thanks 🙂

This would be great, @Shorn could you share a link to the a1 code you are using? Also how is your shield modified?

I am using the most recent and stock Polargraph_a1 code for my Nano--only changes in the code are for my pinouts.

https://github.com/euphy/polargraphcontroller/releases/tag/2017-11-01-20-30

If you can move it outside of the Polargraph software you should be able to move it with the Polargraph Controller. Just make sure you have set the home point, 'unpause' the machine and like Sandy said use the "move to point" feature as a 'jog'.

One change I made to my Nano was to reflash it with the Uno bootloader. I run all my Nanos this way as it frees up precious memory, but I don't think it is necessary for this.

As for the shield, I am using a cheap 'Keyestudio CNC shield' clone I got off Amazon. The problem with it was that the jumpers for setting the microstep configuration were tied to ground (inside the circuit board) and they need to be pulled high to set them. This board error effectively made the microstep jumpers permanently disabled. I removed all the 2 pin headers and hand wired them to enable the micro stepping.

-Shorn