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 . 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 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