Hi, all In case of Separate compilation, using Serial.print in the ico file 'Serial' was not declared in this scope It will result in an error with. In cpp or h file, I should declare extern, but what should be declared as Serial's type ? Or, where is it defined ? Thank you.

Serial was not declared

saitoib October 25, 2017, 2:03pm 3

I solved it.

Thank you very much.