LED matrix array sink and source?
Looking at matth3w instructable https://www.instructables.com/id/LED-Umbrella-with-Arduino/
, as a rough guide line for hardware setup, He is just sourcing the rows with MIC2981 driver but has nothing to sink the current except the arduino.
Should I also
use something to sink the current like a ULN2803 or HEF4794 to protect the arduino if all the LEDs in a column are on?