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Step 2The LED Matrix Panel, or LMP
The LMP is 6-columns across by 5-rows down, totalling 30 LEDs. The size is chosen because this size Matrix is the smallest that can be used to display the English alphabet, and wide enough to be used for scrolling messages. It is also the largest matrix that can be built using ONLY the available output pins on 1 side of the Arduino package.
Technically: the columns are controlled by digital pins 2 through 7 (PORTD), while the rows use pins 8 through 12. This form of matrix addressing means that only ONE LED can be lit at any time, but allows us to control 30 LEDs individually without needing expensive multiplexing and addressing hardware.
Before we get to the actual construction, take a look at this youtube video to see some of the display functions that we can use the panel for.
http://www.youtube.com/watch?v=lCBOTupvXIY
Technically: the columns are controlled by digital pins 2 through 7 (PORTD), while the rows use pins 8 through 12. This form of matrix addressing means that only ONE LED can be lit at any time, but allows us to control 30 LEDs individually without needing expensive multiplexing and addressing hardware.
Before we get to the actual construction, take a look at this youtube video to see some of the display functions that we can use the panel for.
http://www.youtube.com/watch?v=lCBOTupvXIY
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