I think the upsy desky project has support for different protocols (communication between control panel and controller)
This project supports just one ATM.
That project specifies supported models by controller name, which makes sense. There’s some indication that some of the newer Desky models may use another Jiecang protocol which is not yet supported (there is one case in this thread somewhere).
The list of supported models is probably just as much reflects who has stumbled upon the project and decided to try/test.
As TJ is actively developing and supporting that project the supported model list can grow a bit. Whereas this project doesn’t have as much ongoing cpp developer support.
Each project might attract different people who find both. This one is cheaper and DIY. The other has off the shelf hardware and probably more official support.
There’s also the Phord project.
Probably everyone is having a bit of a look at each others projects and bringing in bits and pieces. I took a few things from the Phord project.
That’s my reflections anyway.