About this component
Lights when D13 is driven high, which makes it the usual first test of a working board (the Blink sketch). Because D13 is also the SPI clock, the LED flickers during SPI transfers and adds a small load to that pin.
What it does on this board
On-board LED tied to digital pin 13.
Pinout & readings
No pinout or reference readings yet — these show what each pin does and what a healthy part should measure.