The Built-in LED on Arduino: A Guide
The Arduino boards come with a useful component known as the built-in LED. This LED is easily identifiable by the letter L located next to it. On the Arduino Uno, you can find it near pin #13, while on the Arduino MKR 1010 WiFi board, it is positioned near the 5V output pin. In most Arduino boards, this LED is connected to the digital I/O pin #13. However, on certain boards like the Arduino MKR series, it is linked to pin #6....