Led Dot Matrix 8×8 adalah modul display yang menggunakan beberapa LED yang dirangkai menjadi satu kesatuan dengan 8 baris dan 8 kolom. Modul ini dikontrol menggunakan IC MAX7219 sebagai drivernya.
Sekarang pertanyaannya adalah bagaimana cara LED bisa hidup dengan perintah dari mikro untuk menampilkan karakter, kita perlu mendefinisikannya dalam array karakter atau byte. Dalam hal ini modul yang diakses adalah 0 dan 1. Perhatikan gambar berikut:
 |
| Character Bytes |
Gambar diatas adalah contoh untuk menampilkan karakter A dan B, dengan pendefinisan LED yang bernilai 0 akan mati, dan LED yang bernilai 1 akan hidup.
 |
| Smile Character |
Modul ini menggunakan catu daya sebesar +5VDC dari luar rangkaian, papan breakout umum untuk MAX7219 dilengkapi dengan resistor antara 5V dan pin IC nomor 18. Resistor digunakan untuk mengatur kecerahan atau aliran arus ke LED. Untuk berkomunikasi dengan modul ini harus menghubungkan pin SDA (Serial Data) dan SCL (Serial Clock) pada pin mikrokontroller.
Rangkaian LED dapat dilihat pada gambar berikut ini:
 |
| LED Dot Matrix Schematic |
Setelah menghubungkan LED dot matrix dengan Arduino, coba dengan memasukkan program menggunakan library MaxMatrix yang dapat diunduh dari GitHub.
/*
8x8 LED Matrix MAX7219
https://www.amg36.net/
*/
#include
int DIN = 7; // DIN pin dari MAX7219 modul
int CLK = 6; // CLK pin dari MAX7219 modul
int CS = 5; // CS pin dari MAX7219 modul
int maxInUse = 1;
MaxMatrix m(DIN, CS, CLK, maxInUse);
char A[] = {4, 8,
B01111110,
B00010001,
B00010001,
B01111110,
};
char B[] = {4, 8,
B01111111,
B01001001,
B01001001,
B00110110,
};
char smile01[] = {8, 8,
B00111100,
B01000010,
B10010101,
B10100001,
B10100001,
B10010101,
B01000010,
B00111100
};
char smile02[] = {8, 8,
B00111100,
B01000010,
B10010101,
B10010001,
B10010001,
B10010101,
B01000010,
B00111100
};
char smile03[] = {8, 8,
B00111100,
B01000010,
B10100101,
B10010001,
B10010001,
B10100101,
B01000010,
B00111100
};
void setup() {
m.init(); // MAX7219 inisial
m.setIntensity(8); // intensitas LED, 0-15
}
void loop() {
// Atur LED mati pada x,y or baris dan kolom
m.setDot(6,2,true);
delay(1000);
m.setDot(6,3,true);
delay(1000);
m.clear(); // hapus display
for (int i=0; i<8 0="" a="" at="" b="" character="" code="" corner="" delay="" displaying="" false="" for="" i="" int="" left="" m.clear="" m.setdot="" m.shiftleft="" m.writesprite="" of="" smile01="" smile02="" smile03="" the="" true="" upper="" x="" y="">
Program diatas merupakan program basic untuk menampilkan karacter A, B dan Smile yang didapat dari library MaxMatrix.
Kemudian, dibawah ini merupakan contoh program TEKS BERJALAN :
/*
8x8 LED Matrix MAX7219 TEKS BERJALAN
*/
#include
#include
PROGMEM const unsigned char CH[] = {
3, 8, B00000000, B00000000, B00000000, B00000000, B00000000, // space
1, 8, B01011111, B00000000, B00000000, B00000000, B00000000, // !
3, 8, B00000011, B00000000, B00000011, B00000000, B00000000, // "
5, 8, B00010100, B00111110, B00010100, B00111110, B00010100, // #
4, 8, B00100100, B01101010, B00101011, B00010010, B00000000, // $
5, 8, B01100011, B00010011, B00001000, B01100100, B01100011, // %
5, 8, B00110110, B01001001, B01010110, B00100000, B01010000, // &
1, 8, B00000011, B00000000, B00000000, B00000000, B00000000, // '
3, 8, B00011100, B00100010, B01000001, B00000000, B00000000, // (
3, 8, B01000001, B00100010, B00011100, B00000000, B00000000, // )
5, 8, B00101000, B00011000, B00001110, B00011000, B00101000, // *
5, 8, B00001000, B00001000, B00111110, B00001000, B00001000, // +
2, 8, B10110000, B01110000, B00000000, B00000000, B00000000, // ,
4, 8, B00001000, B00001000, B00001000, B00001000, B00000000, // -
2, 8, B01100000, B01100000, B00000000, B00000000, B00000000, // .
4, 8, B01100000, B00011000, B00000110, B00000001, B00000000, // /
4, 8, B00111110, B01000001, B01000001, B00111110, B00000000, // 0
3, 8, B01000010, B01111111, B01000000, B00000000, B00000000, // 1
4, 8, B01100010, B01010001, B01001001, B01000110, B00000000, // 2
4, 8, B00100010, B01000001, B01001001, B00110110, B00000000, // 3
4, 8, B00011000, B00010100, B00010010, B01111111, B00000000, // 4
4, 8, B00100111, B01000101, B01000101, B00111001, B00000000, // 5
4, 8, B00111110, B01001001, B01001001, B00110000, B00000000, // 6
4, 8, B01100001, B00010001, B00001001, B00000111, B00000000, // 7
4, 8, B00110110, B01001001, B01001001, B00110110, B00000000, // 8
4, 8, B00000110, B01001001, B01001001, B00111110, B00000000, // 9
2, 8, B01010000, B00000000, B00000000, B00000000, B00000000, // :
2, 8, B10000000, B01010000, B00000000, B00000000, B00000000, // ;
3, 8, B00010000, B00101000, B01000100, B00000000, B00000000, // <
3, 8, B00010100, B00010100, B00010100, B00000000, B00000000, // =
3, 8, B01000100, B00101000, B00010000, B00000000, B00000000, // >
4, 8, B00000010, B01011001, B00001001, B00000110, B00000000, // ?
5, 8, B00111110, B01001001, B01010101, B01011101, B00001110, // @
4, 8, B01111110, B00010001, B00010001, B01111110, B00000000, // A
4, 8, B01111111, B01001001, B01001001, B00110110, B00000000, // B
4, 8, B00111110, B01000001, B01000001, B00100010, B00000000, // C
4, 8, B01111111, B01000001, B01000001, B00111110, B00000000, // D
4, 8, B01111111, B01001001, B01001001, B01000001, B00000000, // E
4, 8, B01111111, B00001001, B00001001, B00000001, B00000000, // F
4, 8, B00111110, B01000001, B01001001, B01111010, B00000000, // G
4, 8, B01111111, B00001000, B00001000, B01111111, B00000000, // H
3, 8, B01000001, B01111111, B01000001, B00000000, B00000000, // I
4, 8, B00110000, B01000000, B01000001, B00111111, B00000000, // J
4, 8, B01111111, B00001000, B00010100, B01100011, B00000000, // K
4, 8, B01111111, B01000000, B01000000, B01000000, B00000000, // L
5, 8, B01111111, B00000010, B00001100, B00000010, B01111111, // M
5, 8, B01111111, B00000100, B00001000, B00010000, B01111111, // N
4, 8, B00111110, B01000001, B01000001, B00111110, B00000000, // O
4, 8, B01111111, B00001001, B00001001, B00000110, B00000000, // P
4, 8, B00111110, B01000001, B01000001, B10111110, B00000000, // Q
4, 8, B01111111, B00001001, B00001001, B01110110, B00000000, // R
4, 8, B01000110, B01001001, B01001001, B00110010, B00000000, // S
5, 8, B00000001, B00000001, B01111111, B00000001, B00000001, // T
4, 8, B00111111, B01000000, B01000000, B00111111, B00000000, // U
5, 8, B00001111, B00110000, B01000000, B00110000, B00001111, // V
5, 8, B00111111, B01000000, B00111000, B01000000, B00111111, // W
5, 8, B01100011, B00010100, B00001000, B00010100, B01100011, // X
5, 8, B00000111, B00001000, B01110000, B00001000, B00000111, // Y
4, 8, B01100001, B01010001, B01001001, B01000111, B00000000, // Z
2, 8, B01111111, B01000001, B00000000, B00000000, B00000000, // [
4, 8, B00000001, B00000110, B00011000, B01100000, B00000000, // \ backslash
2, 8, B01000001, B01111111, B00000000, B00000000, B00000000, // ]
3, 8, B00000010, B00000001, B00000010, B00000000, B00000000, // hat
4, 8, B01000000, B01000000, B01000000, B01000000, B00000000, // _
2, 8, B00000001, B00000010, B00000000, B00000000, B00000000, // `
4, 8, B00100000, B01010100, B01010100, B01111000, B00000000, // a
4, 8, B01111111, B01000100, B01000100, B00111000, B00000000, // b
4, 8, B00111000, B01000100, B01000100, B00101000, B00000000, // c
4, 8, B00111000, B01000100, B01000100, B01111111, B00000000, // d
4, 8, B00111000, B01010100, B01010100, B00011000, B00000000, // e
3, 8, B00000100, B01111110, B00000101, B00000000, B00000000, // f
4, 8, B10011000, B10100100, B10100100, B01111000, B00000000, // g
4, 8, B01111111, B00000100, B00000100, B01111000, B00000000, // h
3, 8, B01000100, B01111101, B01000000, B00000000, B00000000, // i
4, 8, B01000000, B10000000, B10000100, B01111101, B00000000, // j
4, 8, B01111111, B00010000, B00101000, B01000100, B00000000, // k
3, 8, B01000001, B01111111, B01000000, B00000000, B00000000, // l
5, 8, B01111100, B00000100, B01111100, B00000100, B01111000, // m
4, 8, B01111100, B00000100, B00000100, B01111000, B00000000, // n
4, 8, B00111000, B01000100, B01000100, B00111000, B00000000, // o
4, 8, B11111100, B00100100, B00100100, B00011000, B00000000, // p
4, 8, B00011000, B00100100, B00100100, B11111100, B00000000, // q
4, 8, B01111100, B00001000, B00000100, B00000100, B00000000, // r
4, 8, B01001000, B01010100, B01010100, B00100100, B00000000, // s
3, 8, B00000100, B00111111, B01000100, B00000000, B00000000, // t
4, 8, B00111100, B01000000, B01000000, B01111100, B00000000, // u
5, 8, B00011100, B00100000, B01000000, B00100000, B00011100, // v
5, 8, B00111100, B01000000, B00111100, B01000000, B00111100, // w
5, 8, B01000100, B00101000, B00010000, B00101000, B01000100, // x
4, 8, B10011100, B10100000, B10100000, B01111100, B00000000, // y
3, 8, B01100100, B01010100, B01001100, B00000000, B00000000, // z
3, 8, B00001000, B00110110, B01000001, B00000000, B00000000, // {
1, 8, B01111111, B00000000, B00000000, B00000000, B00000000, // |
3, 8, B01000001, B00110110, B00001000, B00000000, B00000000, // }
4, 8, B00001000, B00000100, B00001000, B00000100, B00000000, // ~
};
int DIN = 7; // DIN pin dari MAX7219 modul
int CLK = 6; // CLK pin dari MAX7219 modul
int CS = 5; // CS pin dari MAX7219 modul
int maxInUse = 2;
MaxMatrix m(DIN, CS, CLK, maxInUse);
byte buffer[10];
char text[]= "amg36.net"; // teks yang berjalan pada display
void setup() {
m.init(); // inisial modul
m.setIntensity(15); // intensitas LED 0-15
}
void loop() {
printStringWithShift(text, 100); // (Kecepatan berjalannya LED)
}
void printCharWithShift(char c, int shift_speed) {
if (c < 32) return;
c -= 32;
memcpy_P(buffer, CH + 7 * c, 7);
m.writeSprite(32, 0, buffer);
m.setColumn(32 + buffer[0], 0);
for (int i = 0; i < buffer[0] + 1; i++)
{
delay(shift_speed);
m.shiftLeft(false, false);
}
}
void printStringWithShift(char* s, int shift_speed) {
while (*s != 0) {
printCharWithShift(*s, shift_speed);
s++;
}
}
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