Datasheet

https://adafru.it/aYM

You'll also need to download the Adafruit GFX library (https://adafru.it/aJa) - rename it Adafruit_GFX and install it as the

LED backpack library. Close all open IDE windows and restart the IDE.

Once you've restarted you should be able to select the File?Examples?Adafruit_LEDBackpack?sevenseg example

sketch. Upload it to your Arduino as usual. You should see a "sevenseg" example sketch that will demonstrate various

capabilities of the library and the display.

Once you're happy that the matrix works, you can write your own sketches.

There's a few ways you can draw to the display. The easiest is to just call print - just like you do with Serial

print(

variable,

HEX) - this will print a hexidecimal number, from 0000 up to FFFF

print(

variable,

DEC) or print(

variable

) - this will print a decimal integer, from 0000 up to 9999

If you need more control, you can call writeDigitNum(

location

number

) - this will write the

number

(0-9) to a single

location. Location #0 is all the way to the left, location #2 is the colon dots so you probably want to skip it, location #4

is all the way to the right.

To control the colon and decimal points, use the writeDigitRaw(location, bitmap) function. (Note that both dots of the

center colon are wired together internal to the display, so it is not possible to address them separately.) Specify 2 for

the location and the bits are mapped as follows:

0x02 - center colon (both dots)

0x04 - left colon - lower dot

0x08 - left colon - upper dot

0x10 - decimal point