Three LEDs are placed on the board, close to the RTC clock battery plug and to the Ethernet connector.

They have three different colors:

  • Orange, connected to Arduino pin 13. By default it is available from M4 core;
  • Red, by default it is connected to A9 and shows SD card input/output activity;
  • Green, connected to PMIC. It turns on when the chip is powered.
This page was last updated on Tuesday, October 23, 2018 at 4:04 PM.