Hello!
I'm not aware of such examples.
Thinking about what you were asking earlier, I'm not sure you should go directly to such a system.
Apparently you were trying to communicate between a PC and another device potentially implementing
an MCU, and you wanted to switch motors and blink LEDs, which can be done even without any kind
of scheduler.
And beside this, your strategy seems to consist in finding anything that implements preemptive
scheduling. Is it a study project in which you want to implement some kind of preemptive scheduler?
If yes, that makes sense, but I think you should first play with (and master) simpler systems.
Dora.