Datasheet

update it to add up to 8 matrix names you defined. For example, 4 panels looks like:

Adafruit_TrellisSet trellis = Adafruit_TrellisSet(&matrix0, &matrix1, &matrix2, &matrix3);

Say the number

Change this number from 1 to whatever # you are addressing

// set to however many you're working with here, up to 8

#define NUMTRELLIS 1

Begin again

Change the begin() call to add more addresses. Originally we only have the default 0x70 address:

trellis.begin(0x70); // only one

Change this to add all the addresses you are using:

trellis.begin(0x70, 0x71, 0x72, 0x73); // four!

That's it! Now your TrellisSet will know and control up to 8 panels.