I've programmed some of MarginallyClever's CNC demo code into some Wokwi simulations.
4 Axis XYZE on Uno with Protoneer CNC Shield
https://wokwi.com/projects/381581240931217409
6 axis on Arduino Mega with Rumba-like pin assigments
https://wokwi.com/projects/327981866411885138
6 axis on Arduino Mega, Rumba pins, using Timer1 code
https://wokwi.com/projects/382433130635978753
6 axis CNC on ESP32
https://wokwi.com/projects/383243895939013633
Code
The source of the codes are several of the programs in this repository:
The code from the Github site is a bit rough, since MarginallyClever moved on to a fork of Marlin for his Makelangelo wall-drawing robot.
However, the relatively simple programs (as compared to GRBL) behind these demos show interesting methods of coordinating motion among steppers using the Bresenham line-drawing algorithm, parsing GCODE, etc..
If you need to move a few steppers with coordinated motion, you could use some buttons or code to feed some canned or computed GCODE into the parsers and get some quick results.
There are no warranties on this code, since I copied it from Marginally Clever's github. I copied it to implement stepper motion in the Wokwi simulator, to research feasibility of hacking on GCODE without trying to debug GRBL, and to experiment with an Uno, shield and steppers.
MarginallyClever's Code for 4 axis CNC demo on Uno with CNCShield V3
There's some documentation if the internet archive;
Hat tip to the Protoneer folks who designed the CNC Shield V3 :
Lots of people cloned it and undercut them, but the Protoneer folks are the originators.
Notes
I did try GRBL on a Wokwi Uno with the shield, and it compiles and runs a bit, but crashes because of an edge case with how GRBL cleverly uses the timers that is unsupported by Wokwi.
Other implementations:
| Link | Notes |
|---|---|
| Wokwi - Online ESP32, STM32, Arduino Simulator | 2 axis, no drivers mega |
| Wokwi - Online ESP32, STM32, Arduino Simulator | 6 axis Rumba code, no hardware |
| Wokwi - Online ESP32, STM32, Arduino Simulator | 6 axis Rumba, Hardware |
| Wokwi - Online ESP32, STM32, Arduino Simulator | 2 axis direct connect |
| Wokwi - Online ESP32, STM32, Arduino Simulator | 4 axis ramps-like connections |
| Wokwi - Online ESP32, STM32, Arduino Simulator | grbl with 4 axis ramps-like connections, broken on Wokwi |
| Wokwi - Online ESP32, STM32, Arduino Simulator | 2 axis CNC V3 |
| Wokwi - Online ESP32, STM32, Arduino Simulator | 4 axis AFS motor shield, broken on Wokwi. |
| Wokwi - Online ESP32, STM32, Arduino Simulator | 6 axis Rumba wiring |
| Wokwi - Online ESP32, STM32, Arduino Simulator | 6 axis rumba with a patch |
| Wokwi - Online ESP32, STM32, Arduino Simulator | 6 axis on an ESP32 |
| Wokwi - Online ESP32, STM32, Arduino Simulator | 4 axis V3 Acceleration Experiments |
| Wokwi - Online ESP32, STM32, Arduino Simulator | 6 axis acceleration experiments |