Shield MaTrix is a stackable Shield for Arduino, which makes it possible to learn programming using the most simple sensors on board.
Model: 830069001
To display different information on the LED matrix display uses dynamic . At the same time information is displayed only one line ( corresponding LED lights (red and (or ) green ) ) , all other lines - repaid. The next step - the previous line is extinguished and ignited the next line ( for her current LEDs). Switching rows is very fast and eyes perceive this switch as a single image .
To minimize the number of pins involved are two different types of chips: the shift registers (used for control columns) and a demultiplexer ( control lines).
Shift registers included chain and connected via SPI ( pins involved are described below).
Demultiplexer has three address inputs (DA0, DA1, DA2) - a combination of "0" and "1" at the entrances clearly points to one of the 8 outputs, which will be active level . Additionally the demultiplexer has control inputs (E1, E2, E3) - with the first two (E1 and E2, they are connected in our scheme ) organized a complete quenching of the matrix , and with the input E3 - organized brightness adjustment (using PWM) .
Pins on the board, involved on Arduino Mega:
The right side of the board (when viewed from the matrix) are:
On the left side of the board are:
To use the various components Shield MaTrix requires the following libraries:
Displays information on the matrix - MaTrix - MaTrix (including a simple display test and two real time display sketches.)
Additionally required libraries that are used during operation of libraries:
Only two libraries require little comment on their use:
Since the IR receiver connected to digital pin of 5 must file / IRremote / IRremoteInt.h correct code as follows:
... // Arduino Mega #if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) //#define IR_USE_TIMER1 // tx = pin 11 //#define IR_USE_TIMER2 // tx = pin 9 #define IR_USE_TIMER3 // tx = pin 5 //#define IR_USE_TIMER4 // tx = pin 6 //#define IR_USE_TIMER5 // tx = pin 46 ...
Initialize the module as follows:
... //iBoardRF24 radio(CE,CSN,MOSI,MISO,SCK,IRQ); iBoardRF24 radio(41,40,39,38,37,19); ...
To use the library in your sketch MaTrix need to declare a function void setup () to enter the following line of code:
#include <SPI.h> #include <MaTrix.h> //connection library MaTrix MaTrix mymatrix; //object creation mymatrix
byte array[8][8] - main array. The data from this array is determined that the currently displayed on the LED matrix
byte array[8][8] = { // An array of 64 bytes
{B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000}, // строка 7
{B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000}, // строка 6
{B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000}, // строка 5
{B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000}, // строка 4
{B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000}, // строка 3
{B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000}, // строка 2
{B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000}, // строка 1
{B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000} // строка 0
// red3 green3 red2 green2 red1 green1 red0 green0
};
Each bit corresponds to the corresponding LED in the matrix. 0 - LED "extinguished", 1 - LED "lit"
byte shadow[8][8] - additional ("shadow") array.
Library functions used for organizing various effects and scrolling text (data from the shadow of the array for a particular effect rewritten the rule of the "shadow" of the array in the main).
byte shadow[8][8] = { //An array of 64 bytes
{B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000}, // строка 7
{B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000}, // строка 6
{B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000}, // строка 5
{B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000}, // строка 4
{B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000}, // строка 3
{B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000}, // строка 2
{B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000}, // строка 1
{B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000} // строка 0
// red3 green3 red2 green2 red1 green1 red0 green0
};
// Color #define RED 0 #define GREEN 1 #define YELLOW 2
// delay iteration in "drawing" effects (ms) #define VSLOW 500 #define SLOW 150 #define MID 100 #define FAST 50 #define VFAST 25
// effects #define FADE 4 #define LEFT 3 #define UP 1 #define DOWN 2 #define NONE 0
// hardware data #define BRIGHT 44 // brightness (pin 44 - PWM) #define LightSENS A7 // light sensor
mymatrix.init();
mymatrix.clearLed();
mymatrix.brightness(byte brightLevel);
Example of use:
mymatrix.brightness(177);
mymatrix.get Brightness();
Example of use:
Serial.println(mymatrix.getBrightness());
printString(String s, byte pos, byte color, unsigned char *Font, char effect, int speed);
Example of use:
mymatrix.printString("123", 3, GREEN, font6x8, UP, SLOW);
printRunningString(String s, byte color, unsigned char *Font, int speed);
Example of use:
mymatrix.printRunningString("MaTrix test!", RED, font6x8, FAST);
printArray();
printShadow();
printChar(unsigned char sym, byte pos, byte color);
Attention! Font that is used when calling the function must be defined using the setFont.
printCharShadow(unsigned char sym, byte pos, byte color);
printStr(unsigned char *s, byte pos, byte color);
Attention! Font that is used when calling the function must be defined using the setFont.
printStrShadow(unsigned char *s, byte pos, byte color);
Current version of the library MaTrix
All the components used to produce the product.
Please list your question here:
If you have questions or other better design ideas,
| Revision | Descriptions | Release |
| 0.9 | Prototype | 11.04.2013 |
| 0.9b | Public version | 27.10.2013 |
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licensed under GPL/LGPL, see source code files for details.
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