User Manual

OE connects to Arduino pin 9. This is the same for all

boards.

OE (output enable) switches the LEDs off when

transitioning from one row to the next.

CLK Wire

Last one!

CLK connects to…

Pin 8 on Arduino Uno, Adafruit Metro 328 or

Metro M0.

Pin A4 on Adafruit Metro M4.

Pin 11 on Arduino Mega.

The CLK (clock) signal marks the arrival of each bit of

data.

Here’s that photo again of a completed shield. You can tell this is for a 32x16 matrix, because there are four ground

connections (one of the long vertical strips is a ground bus — see the tiny jumpers there?).

The ribbon cable to the matrix would plug into this with the key facing left.

The colors and positions don’t quite match the examples above, but are close. G1 and G2 are yellow wires. LAT is the

purple wire and should go to pin 10 now (we changed around some things in the Arduino library).