Datasheet

capable micro.

Wiring to the matrix is really easy

Connect CLK to the I2C clock - on Arduino UNO thats Analog #5, on the Leonardo its Digital #3, on the Mega its

digital #21

Connect DAT to the I2C data - on Arduino UNO thats Analog #4, on the Leonardo its Digital #2, on the Mega its

digital #20

Connect GND to common ground

Connect VCC+ to power - 5V is best but 3V also seems to work for 3V microcontrollers.

Next, download the Adafruit LED Backpack library from github (https://adafru.it/aLI) . To download click the

DOWNLOADS button in the top right corner, rename the uncompressed folder Adafruit_LEDBackpack. Check that

the Adafruit_LEDBackpack folder contains Adafruit_LEDBackpack.cpp and Adafruit_LEDBackpack.h Place

the Adafruit_LEDBackpack library folder your

arduinosketchfolder

/libraries/ folder. You may need to create

the

libraries

subfolder if its your first library. You'll also need to download the Adafruit GFX

library (https://adafru.it/aJa) that provides the graphics drawing routines. Restart the IDE.

Once you've restarted you should be able to select the File->Examples->Adafruit_LEDBackpack->matrix88 example

sketch. Upload it to your Arduino as usual. You should see a basic test program that goes through a bunch of different

drawing routine

Once you're happy that the matrix works, you can write your own sketches. The 8x8 matrix supports everything the

Adafruit GFX library - drawing pixels, lines, rectancles, circles, triangles, roundrects, and small bitmaps. For more details

check out the GFX page which will detail all of the GFX routines (https://adafru.it/aPx).

All the drawing routines only change the display memory kept by the Arduino. Don't forget to call writeDisplay() after

drawing to 'save' the memory out to the matrix via I2C.