I see in the documentation you can not "daisy chain" MAX7219 LED displays. From what I understand, if I want to use 2 or more, I need to assign a pin (CLK) for each display. If that is true:
Pin #27 "L" is shared between the 2 MAX7219s
Pin #28 "D" is shared between the 2 MAX7219s
Pin #30 (CLK) for 1 MAX7219
PIN #31 (CLK) for 2nd MAX7219
N30 D=0 B=1,10 b=0
N31 D=0 B=1,10 b=0
N31 Nav1_Active o=2
N30 Nav1_Standby o=2
When x-plane loads, I see they display correctly:
Once I change the stand-by freq, the second MAX7219 gets screwed up:
My question is, do I need a 74HC4051 8-Channel Multiplexer board or am I doing this incorrectly?
** EDIT **
I was able to get this working by double checking my connections. I also noticed you can't turn the encoder too fast or its screws up the display. Nevertheless, pretty cool how it all works with relative ease.