Datasheet

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->bargraph24 example

sketch. Upload it to your Arduino as usual. You should see a basic test program that tests all the LEDs with different

colors