User Manual

Using color-coded wires helps a

lot!

If you don’t have colored wires, that’s okay, just pay close attention where

everything goes. Our goal is a fully-populated plug like this:

So! Let’s proceed with the wiring, in groups…

Connect Ground Wires

32x32 and 64x32 matrices require three ground

connections. 32x16 matrices have four.

Current Arduino Uno and similar boards have three

ground pins (the third is next to pin 13). If you need

additional ground connections — for a 32x16 matrix, or if

using an older Arduino board with only 2 ground pins —

a solderless breadboard is handy for linking all these

pins.

Arduino Mega boards have five ground pins. Same

three as the Arduino Uno, plus two more next to pins 52

& 53.