And it seems that it is just the same but without any of the trademark infringements if you decide to sell it etc.. But i dont get how this can be fine to use if its a copy of arduino?
if anyone could explain it would be helpful :-) as i am not an expert in commercial matters.
Besides my question, is it another usefull site if anyone wants to get started with the arduino enviroment
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Note that there are software compatible clones, and hardware compatible clones. The difference being that the latter have exactly the same female pin layout as the arduino, meaning they can have arduino shields plugged directly into them. That iduino, for example, can not directly accommodate expansion shields. It'll still run any code designed for an arduino though.
The arduino name is not free to use, hence the clones having various other names.
I like seeedstudio. They're cheap, pre-assembled, and add some extra features.
Newer arduinos (and clones) have a 328 chip replacing the old 168 chip. Does the same thing, just twice the memory. Not necessary to get started, but useful for larger projects.