Processing no compiles on Arduino UNO R3

Hi Roberto, Welcome to the forum. I think you are a little confused by things.

To put a program (often referred to as a sketch), e.g. Blink, in your Arduino you need the Arduino IDE from the Arduino website. The language is C++.

Processing allows you to write Java programs to run on your PC.

Please note these and try not to be confused:

  • The Processing IDE and the Arduino IDE have developed from the same software. They look quite like each other

  • Java and C++ both developed from C and they are quite similar.

  • Many people use Processing to talk via serial to the program running in the Arduino. This is mostly what this section of the forum is about.

  • In the Processing Examples (File, Examples, Libraries, Serial) e.g. SimpleRead the Processing example contains the Arduino code as comment. You have to copy it out into the Arduino IDE and load it into the Arduino.

Hope this helps, please try things and ask again if you like.

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