Start with this introduction to the Arduino Uno Pinout:

Additional Hints:

  • “Pinout” means the mapping of physical pins to internal microcontroller functionality.
  • Many pins can do more than one thing. None of them can do everything.
  • The I/O expansion board in your kit will give you 8 more inputs/outputs. It connects to the Arduino over the I2C bus (using up two more pins!).
  • The Elegoo kit uses up almost all of the pins on the Arduino. You’ll have to get creative and make trade-offs.

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