I’d guess that you have a .cpp file and did not add at the top:
#include "Particle.h"
It’s one of the things that’s handled automatically when creating a .ino file, but required for .cpp files.
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I’d guess that you have a .cpp file and did not add at the top:
#include "Particle.h"
It’s one of the things that’s handled automatically when creating a .ino file, but required for .cpp files.