How to use Arduino on-board L indicator

Today, I will talk to you about how to use the Arduino on-board L indicator. Many people may not know much about it. In order to make you understand better, the editor has summarized the following contents for you. I hope you can get something according to this article.

There is an "L" indicator light on the Arduino board, which can be understood as a LED lamp. Without any external LED lights, you can use this indicator to test whether the board can work properly, or some simple debugging and other functions.

L LED location (take Leonardo as an example):

This onboard L indicator corresponds to the output pin 13, and the onboard L indicator cannot be lit with other pins.

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