Powering the System

The Matrix LED TinyShield can be run using a coin cell. The LEDs run directly off of the Vcc supply, a higher input voltage will make the LEDs brighter.

Using the Matrix LED TinyShield

The TinyShield Matrix LED shield can use the LOL Shield library from Jimmie Rodgers: http://jimmieprodgers.com/kits/lolshield with two modifications. The number of rows is different and the LED mapping is different.

You can download a premodified version of this library here

Note: Unzip this library to the Arduino\libraries directory, and restart the Arduino IDE to use.

You can also modify the original LOLShield library by doing the following:

In Charlieplexing.h change the DISPLAY_ROWS definition to 9

 #define DISPLAY_ROWS 9 // Number of rows in the display 

In Charlieplexing.cpp change the ledMap array to match the following:

const LEDPosition PROGMEM ledMap[54] = {
    L(5, 6), L(8, 6), L(6, 9), L(2, 7), L(8, 9), L(2,3),
    L(6, 5), L(6, 8), L(9, 6), L(7, 2), L(9, 8), L(3,2),
    L(5, 7), L(7, 6), L(6, 4), L(3, 7), L(8, 4), L(3,4),
    L(7, 5), L(6, 7), L(4, 6), L(7, 3), L(4, 8), L(4,3),    
    L(5, 8), L(2, 5), L(6, 3), L(4, 7), L(8, 3), L(2,9),
    L(8, 5), L(5, 2), L(3, 6), L(7, 4), L(3, 8), L(9,2),
    L(5, 9), L(3, 5), L(6, 2), L(9, 7), L(8, 2), L(3,9),
    L(9, 5), L(5, 3), L(2, 6), L(7, 9), L(2, 8), L(9,3),
    L(5, 4), L(4, 5), L(7, 8), L(8, 7), L(9, 4), L(4,9)   
}

Examples: Scroll Text

1. Install the LOLShield Library to the Arduino\libraries\ directory
2. Restart the Arduino IDE
3. Go to the File… Menu, Examples… LOLShield… LolShield_FontTest
4. Change the text on the line that say static const char test[]=”HELLO WORLD! “; to be what you want it to scroll (Note: Text must be uppercase).
5. Upload the sketch to the TinyDuino with the Matrix LED TinyShield plugged in and watch it scroll!

Examples: Name Tag

Download the following example sketch using the codebender plugin to make a TinyNameTag using the Matrix LED.