Using the Matrix LED TinyShield Tutorial

by TinyCircuits Staff February 19, 2016

Using the Matrix LED TinyShield Tutorial

The Matrix LED TinyShield is a 6 x 9 grid of LEDs (54 total LEDs) that are individually addressable, which lets you scroll text, draw images and all sorts of other things. This TinyShield is compatible with the popular Arduino LoL Shield Library (Lots of LEDs Shield) created by Jimmie Rodgers. The LEDs are arranged using Charlieplexing, which is a technique to allow for control of multiple LEDs using fewer I/O signals. Available with Red, Green and Amber LED color options.

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: 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.

TinyCircuits Staff
TinyCircuits Staff


Also in Learn

New Tiny Arcade - Assembly Instructions (With Rev5 Boards)
New Tiny Arcade - Assembly Instructions (With Rev5 Boards)

by TinyCircuits Staff January 15, 2019

We are super excited to release our latest version of the beloved Tiny Arcade kit! This assembly tutorial features our...

View full article →

Command Servo Motors from your Phone using Bluetooth
Command Servo Motors from your Phone using Bluetooth

by TinyCircuits Staff December 27, 2018

Using a TinyZero, Bluetooth TinyShield, Servo TinyShield, and a servo along with a handy dandy iOS or Android app, you...

View full article →

Tiny Screen Video(TSV) Converter Install for macOS
Tiny Screen Video(TSV) Converter Install for macOS

by Laverena Wienclaw December 19, 2018

In this tutorial we'll talk about how you can get a Windows application running on your Mac (for free) using Wine...

View full article →