I have breadboarded a tiny 2 column X 4 row LED matrix to test out the MAX7219. Everything works great except for 1 thing: I can’t turn on both LEDs in a row at the same time; doing so appears to reset the MAX7219 and put it back into power-save mode. (All LEDs go off and stay off.)
Currently I’m using the 5V output of the Arduino Uno; does it sound like I’m exceeding the capacity of the board to supply power? Should I try it with a separate 5V source?
FYI I can turn on all 4 LEDs in a column, and basically any combination as long as it’s not both LEDs on the same row.
I’m using a 560ohm resistor for RSet.
Snapshot of my setup is attached. I got the light combination shown with this code:
Here’s an example that I’m NOT able to do (turn on whole row):