Solve: Arduino Compilation Errors

Arduino programming can occasionally result in compilation errors during the development of sketches. One common error is the "Redefinition of 'void setup()'" error, which occurs when the setup() function is defined more than once in the code. This article aims to guide users on identifying, understanding, and resolving this compilation error in the Arduino IDE.

If you encounter the error message 'error: redefinition of 'void setup()', it indicates that your setup() function has been defined more than once in your code. The error message should also specify the location where this duplication occurs.

• Duplicate Definitions: Check for accidental copies of setup() and make sure there's only one.

• Code Structure Issues: Look for unintended repeats in your code structure.

• Library Conflicts: If you're using libraries, check for conflicting setup() definitions.

Note: This error commonly arises when code is copied and pasted without fully replacing the previous code. In such cases, it leads to duplicates of specific lines of code, causing the mentioned compilation error.

• Locate Duplicate Definitions: Review your code and identify any duplicate instances.

• Verify Code Structure: Compare your code to the provided code; check for discrepancies.

• Check Included Libraries: Ensure you have downloaded all necessary libraries; these are listed in the "Downloads & Setup" section of the course / module.

• Recompile: Try recopying the code, replacing all the existing code in the editor, and click compile in the Arduino IDE to see if the error persists.

Dealing with "Redefinition of 'void setup()'" is a common but quickly fixable issue. Follow these steps, and you'll be back to smooth coding. Happy coding!