Arduino Micro, like all other Arduinos, has a built-in led, a green one- on the left in the photo. And it has a pair of yellow leds – called TX and RX – to indicate traffic on the serial bus. Except, on the Micro, there is no actual serial bus involved in programming the Arduino, ...
This story continues at Arduino Micro: direct access to on-board leds
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from Electronics Weekly https://www.electronicsweekly.com/blogs/engineer-in-wonderland/arduino-micro-direct-access-board-leds-2017-08/
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