Can't upload code to Arduino Uno

2

Hi @clemesbot1

For better readability I edited your post and used pre-formatted text for code and log sections.

The error message says:

You have multiple setup() and multiple loop() functions in multiple .cpp files in your project, namely

  • Blink.cpp
  • AlternatingLights.cpp
  • BlinkSerial.cpp
  • SerialLedSwitch.cpp
  • SingleBlink.cpp

This is invalid.
You can just have one setup() and one loop() function in one .cpp file.

Usually you have a main.cpp where setup() loop() and loop are implemented.