led_matrix_8x16.ino

#define COL_NUM 16 // number of columns (16)
#define SPEED 10000

#define LATCH 2

#define CLOCK_ROW 3
#define DATA_ROW  4

#define CLOCK_COL 5
#define DATA_COL 6

unsigned char charMatrix[26][8] = {
    {0b00111111, 0b01010000, 0b10010000, 0b01010000, 0b00111111, 0b00000000, 0b00000000, 0b00000000},//A
    {0b11111111, 0b10010001, 0b10010001, 0b10010001, 0b01101110, 0b00000000, 0b00000000, 0b00000000},//B
    {0b01111110, 0b10000001, 0b10000001, 0b10000001, 0b10000001, 0b00000000, 0b00000000, 0b00000000},//C
    {0b11111111, 0b10000001, 0b10000001, 0b10000001, 0b01111110, 0b00000000, 0b00000000, 0b00000000},//D
    {0b11111111, 0b10010001, 0b10010001, 0b10010001, 0b10010001, 0b00000000, 0b00000000, 0b00000000},//E
    {0b11111111, 0b10010000, 0b10010000, 0b10010000, 0b10010000, 0b00000000, 0b00000000, 0b00000000},//F
    {0b01111110, 0b10000001, 0b10000001, 0b10001001, 0b01001110, 0b00001000, 0b00000000, 0b00000000},//G
    {0b11111111, 0b00010000, 0b00010000, 0b00010000, 0b11111111, 0b00000000, 0b00000000, 0b00000000},//H
    {0b10000001, 0b10000001, 0b11111111, 0b10000001, 0b10000001, 0b00000000, 0b00000000, 0b00000000},//I
    {0b10000011, 0b10000001, 0b11111111, 0b10000000, 0b10000000, 0b00000000, 0b00000000, 0b00000000},//J
    {0b11111111, 0b00011000, 0b00100100, 0b01000010, 0b10000001, 0b00000000, 0b00000000, 0b00000000},//K
    {0b11111111, 0b00000001, 0b00000001, 0b00000001, 0b00000001, 0b00000000, 0b00000000, 0b00000000},//L
    {0b11111111, 0b01000000, 0b00100000, 0b01000000, 0b11111111, 0b00000000, 0b00000000, 0b00000000},//M
    {0b11111111, 0b01000000, 0b00100000, 0b00010000, 0b11111111, 0b00000000, 0b00000000, 0b00000000},//N
    {0b01111110, 0b10000001, 0b10000001, 0b10000001, 0b01111110, 0b00000000, 0b00000000, 0b00000000},//O
    {0b11111111, 0b10010000, 0b10010000, 0b10010000, 0b01100000, 0b00000000, 0b00000000, 0b00000000},//P
    {0b01111110, 0b10000001, 0b10000001, 0b10000101, 0b01111110, 0b00000001, 0b00000000, 0b00000000},//Q
    {0b11111111, 0b10011000, 0b10010100, 0b10010010, 0b01100001, 0b00000000, 0b00000000, 0b00000000},//R
    {0b01100001, 0b10010001, 0b10010001, 0b10010001, 0b01001110, 0b00000000, 0b00000000, 0b00000000},//S
    {0b10000000, 0b10000000, 0b11111111, 0b10000000, 0b10000000, 0b00000000, 0b00000000, 0b00000000},//T
    {0b11111110, 0b00000001, 0b00000001, 0b00000001, 0b11111110, 0b00000000, 0b00000000, 0b00000000},//U
    {0b11111100, 0b00000010, 0b00000001, 0b00000010, 0b11111100, 0b00000000, 0b00000000, 0b00000000},//V
    {0b11111111, 0b00000010, 0b00000100, 0b00000010, 0b11111111, 0b00000000, 0b00000000, 0b00000000},//W
    {0b11000011, 0b00100100, 0b00011000, 0b00100100, 0b11000011, 0b00000000, 0b00000000, 0b00000000},//X
    {0b11100000, 0b00010000, 0b00001111, 0b00010000, 0b11100000, 0b00000000, 0b00000000, 0b00000000},//Y
    {0b10000111, 0b10001001, 0b10010001, 0b10100001, 0b11000001, 0b00000000, 0b00000000, 0b00000000} //Z
};

unsigned char numMatrix[10][8] = {
    {0b01111110, 0b10000001, 0b10000001, 0b10000001, 0b01111110, 0b00000000, 0b00000000, 0b00000000},//0
    {0b00100001, 0b01000001, 0b11111111, 0b00000001, 0b00000001, 0b00000000, 0b00000000, 0b00000000},//1
    {0b01000011, 0b10000101, 0b10001001, 0b10010001, 0b01100001, 0b00000000, 0b00000000, 0b00000000},//2
    {0b01000001, 0b10010001, 0b10010001, 0b10010001, 0b01101110, 0b00000000, 0b00000000, 0b00000000},//3
    {0b11110000, 0b00010000, 0b00010000, 0b11111111, 0b00000000, 0b00000000, 0b00000000, 0b00000000},//4
    {0b11110001, 0b10010001, 0b10010001, 0b10010001, 0b10001110, 0b00000000, 0b00000000, 0b00000000},//5
    {0b01111110, 0b10010001, 0b10010001, 0b10010001, 0b10001110, 0b00000000, 0b00000000, 0b00000000},//6
    {0b10000000, 0b10000000, 0b10011111, 0b10100000, 0b11000000, 0b00000000, 0b00000000, 0b00000000},//7
    {0b01101110, 0b10010001, 0b10010001, 0b10010001, 0b01101110, 0b00000000, 0b00000000, 0b00000000},//8
    {0b01100000, 0b10010001, 0b10010001, 0b10010001, 0b01111110, 0b00000000, 0b00000000, 0b00000000} //9
};

unsigned char specialMatrix[5][8] = {
    {0b00011000, 0b00100100, 0b01000010, 0b00100001, 0b01000010, 0b00100100, 0b00011000, 0b00000000},// HEART
    {0b00000001, 0b00000110, 0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000000},// ,
    {0b00000001, 0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000000},// .
    {0b11111101, 0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000000, 0b00000000} // !
};

unsigned char buffer[COL_NUM];

//Tìm xem một kí tự ứng với đâu trong các mảng UP, NUM, SPECIALS)
unsigned char* getArrFromChar(unsigned char ch) {
    if ((ch >= 48) && (ch <= 57)) // Numbers
        return numMatrix[ch - 48];

    if ((ch>= 65) && (ch <= 90)) // Characters
        return charMatrix[ch - 65];

    switch (ch) { // Specials
    case '$':  // Heart
        return specialMatrix[0];
    case ',':
        return specialMatrix[1];
    case '.':
        return specialMatrix[2];
    case '!':
        return specialMatrix[3];
    };
    return NULL; // if nothing matches
}

//Thêm một kí tự, sau đó gọi hàm addCol để hiển thị từng phần của kí tự
void addChar(char chr) {
    unsigned char* arr = getArrFromChar(chr);
    if (arr == NULL)
        return;
    for (unsigned char i = 0; i < 8; i++) {
        if (arr[i] != 0) { // nice trick there m8
            addCol(arr[i]);
        }
    }
    addCol(0);
}

//Thêm vào một cột vào mảng leds để hiển thị
void addCol(unsigned char col) {
    moveLeft();
    buffer[COL_NUM - 1] = col;
    show(SPEED);
}

// Move everything to the left
void moveLeft() {
    // &buffer[1] because buffer[1] is *(buffer+1), and we need a pointer
    memmove(buffer, &(buffer[1]), (COL_NUM - 1));
}

//Hiển thị mảng leds ra ma trận
void show(unsigned char hold) {
    for (unsigned char k = 0; k < hold; k++) {
        for (unsigned char row = 0; row < 8; row++) {
            unsigned char d[2] = {0, 0};

            for (unsigned char col = 0; col < COL_NUM; col++) {
                d[col/8] = (d[col/8] | ((buffer[col] >> (7-row)) & 1));
                if (col%8!=7)
                    d[col/8]<<=1;
            }

            // Turn off
            digitalWrite(LATCH, LOW);

            // We are printing to row {{row}}
            shiftOut(DATA_ROW, CLOCK_ROW, MSBFIRST, ~(_BV(row)));
            //Serial.print(d[1], BIN);
            //Serial.println(d[0], BIN);
            // Hmm which is the right order then
            shiftOut(DATA_COL, CLOCK_COL, LSBFIRST, d[1]);
            shiftOut(DATA_COL, CLOCK_COL, LSBFIRST, d[0]);

            // Turn on
            digitalWrite(LATCH, HIGH);

           //delay(5000);
        }
    }
}

void parseString(const char* s) {
    while (*s) {
        if (*s == ' ') {
            addCol(0);
            addCol(0);
        } else {
            addChar(toupper(*s));
        }
        s++;
    }
}

void setup() {
    Serial.begin(9600);

    pinMode(LATCH, OUTPUT);

    pinMode(CLOCK_COL, OUTPUT);
    pinMode(DATA_COL, OUTPUT);

    pinMode(CLOCK_ROW, OUTPUT);
    pinMode(DATA_ROW, OUTPUT);
}

void loop() {
    parseString("HAPPY NEW YEAR 2016     ");
}