48x8 SCROLLING MATRIX LED DISPLAY USING ARDUINO CONTROLLER

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About: Mechanical Engineer, with knowledge in Hydraulics and Pneumatics.

Intro: 48x8 SCROLLING MATRIX LED DISPLAY USING ARDUINO CONTROLLER

A monochrome (single colour) LED dot matrix display is used for displaying the Characters and Symbols which is interface with a microcontroller. This project will deliberate on displaying a scrolling text message on a 48×8 LED dot matrix display. The microcontroller used is Arduino Uno which is open source prototype Electronic platform. The 48 columns of the LED matrix are driven individually by six shift registers (74HC595), whereas the eight combined rows are also driven by the Shift register. Here we will be scanning across the rows and feed the column lines with appropriate logic levels. The program in the microcontroller is to determine the speed of the scrolling message as well as Message what we are going to display. The technique will be demonstrated for right to left scroll, but can be easily implemented for scrolling in other directions. The Sketch program for Arduino Uno is developed with Arduino Software.

Step 1: PREPARING THE MATRIX

Matrix wiring each matrix has 64 LEDs. Instead the LEDs are wired into a matrix. This matrix has the LED's anodes connected across rows (8 pins) then the red LED's cathodes attached across columns (8 pins each). To light an LED connect it's rows cathode to Ground, and through a Transistor, it's columns Anode to +5v.
Displaying Images (Scanning) Now that we can light any LED we choose it's time to move on to displaying a (small) image. To do this we will use a scan pattern. In the example code we define a bitmap image (an array of 8 bytes, each bit representing one LED). Next we scan through this array one byte at a time, displaying one column then the next. If we do this fast enough (about 1000 times a second) it appears as an image. It sounds complex but if you download the code and play around it should quickly become clear

Step 2: CONNECTING THE SHFIT REGISTERS AND TRANSISTORS.

Here we use 74HC595 to drive the row and colum

single shift register to drive the row

and daisy chained shift registers with common clock pin to drive columns
- Each shift register can drive 8 columns
-Based on the number of columns number of shift registers can be increased,there is no limit for the columns.

Step 3: Interfacing With Arduino

Pin of Arduino                          Shift register pins
5                                    -             12
6                                    -              11
7                                    -              14

the above are for the column drivers

9                                   -              12
10                                -               11
8                                  -                 14

the above are for the row drivers

Step 4: PROGRAM

int x;
int y;
int latchPin1 = 5; //Arduino pin connected to blue 12 RCLK of 74HC595
int clockPin1 = 6; //Arduino pin connected to green 11 SRCLK of 74HC595
int dataPin1 = 7;  //Arduino pin connected to violet 14 SER of 74HC595

//-- Rows (Positive Anodes) --
int latchPin2 = 9; //Arduino pin connected to yellow Latch 12 RCLK of 74HC595
int clockPin2 = 10; //Arduino pin connected to white Clock 11 SRCLK of 74HC595
int dataPin2 = 8;  //Arduino pin connected to grey Data 14 SER of 74HC595

//=== B I T M A P ===
//Bits in this array represents one LED of the matrix
// 8 is # of rows, 7 is # of LED matrix we have
byte bitmap[8][7]; // Change the 7 to however many matrices you want to use.
int numZones = sizeof(bitmap) / 8;
int maxZoneIndex = numZones-1;
int numCols = numZones * 8;

byte alphabets[][5] = {
  {0,0,0,0,0},
  {31, 36, 68, 36, 31},
  {127, 73, 73, 73, 54},
  {62, 65, 65, 65, 34},
  {127, 65, 65, 34, 28},
  {127, 73, 73, 65, 65},
  {127, 72, 72, 72, 64},
  {62, 65, 65, 69, 38},
  {127, 8, 8, 8, 127},
  {0, 65, 127, 65, 0},
  {2, 1, 1, 1, 126},
  {127, 8, 20, 34, 65},
  {127, 1, 1, 1, 1},
  {127, 32, 16, 32, 127},
  {127, 32, 16, 8, 127},
  {62, 65, 65, 65, 62},
  {127, 72, 72, 72, 48},
  {62, 65, 69, 66, 61},
  {127, 72, 76, 74, 49},
  {50, 73, 73, 73, 38},
  {64, 64, 127, 64, 64},
  {126, 1, 1, 1, 126},
  {124, 2, 1, 2, 124},
  {126, 1, 6, 1, 126},
  {99, 20, 8, 20, 99},
  {96, 16, 15, 16, 96},
  {67, 69, 73, 81, 97},
};

//=== S E T U P ===

void setup() {
  pinMode(latchPin1, OUTPUT);
  pinMode(clockPin1, OUTPUT);
  pinMode(dataPin1, OUTPUT);

  pinMode(latchPin2, OUTPUT);
  pinMode(clockPin2, OUTPUT);
  pinMode(dataPin2, OUTPUT);
 
  //-- Clear bitmap --
  for (int row = 0; row > 8; row++) {
    for (int zone = 0; zone <= maxZoneIndex; zone++) {
      bitmap[row][zone] = 0;
    }
  }
}

//=== F U N C T I O N S ===
// This routine takes whatever we've setup in the bitmap array and display it on the matrix
void RefreshDisplay()
{
  for (int row = 0; row < 8; row++) {
    int rowbit = 1 << row;
    digitalWrite(latchPin2, LOW);  //Hold latchPin LOW for as long as we're transmitting data
    shiftOut(dataPin2, clockPin2, MSBFIRST, rowbit);   //Transmit data

    //-- Start sending column bytes --
    digitalWrite(latchPin1, LOW);  //Hold latchPin LOW for as long as we're transmitting data

    //-- Shift out to each matrix (zone is 8 columns represented by one matrix)
    for (int zone = maxZoneIndex; zone >= 0; zone--) {
      shiftOut(dataPin1, clockPin1, MSBFIRST, bitmap[row][zone]);
    }

    //-- Done sending Column bytes, flip both latches at once to eliminate flicker
    digitalWrite(latchPin1, HIGH
    digitalWrite(latchPin2, HIGH

    //-- Wait a little bit to let humans see what we've pushed out onto the matrix --
    delayMicroseconds(500);
  }
}

// Converts row and colum to actual bitmap bit and turn it off/on
void Plot(int col, int row, bool isOn)
{
  int zone = col / 8;
  int colBitIndex = x % 8;
  byte colBit = 1 << colBitIndex;
  if (isOn)
    bitmap[row][zone] =  bitmap[y][zone] | colBit;
  else
    bitmap[row][zone] =  bitmap[y][zone] & (~colBit);
}
// Plot each character of the message one column at a time, updated the display, shift bitmap left.
void AlphabetSoup()
{
  char msg[] = "YOUR TEXT ";

  for (int charIndex=0; charIndex < (sizeof(msg)-1); charIndex++)
  {
    int alphabetIndex = msg[charIndex] - '@';
    if (alphabetIndex < 0) alphabetIndex=0;
   
    //-- Draw one character of the message --
    for (int col = 0; col < 6; col++)
    {
      for (int row = 0; row < 8; row++)
      {
        bool isOn = 0;
        if (col<5) isOn = bitRead( alphabets[alphabetIndex][col], 7-row ) == 1;
        Plot( numCols-1, row, isOn
      }
     
      //-- The more times you repeat this loop, the slower we would scroll --
      for (int refreshCount=0; refreshCount < 7; refreshCount++) //change  this value to vary speed
        RefreshDisplay();
      //-- Shift the bitmap one column to left --
      for (int row=0; row<8; row++)
      {
        for (int zone=0; zone < numZones; zone++)
        {
          bitmap[row][zone] = bitmap[row][zone] >> 1;
                    // Roll over lowest bit from the next zone as highest bit of this zone.
          if (zone < maxZoneIndex) bitWrite(bitmap[row][zone], 7,
bitRead(bitmap[row][zone+1],0));
        }
      }
    }
  }
}

//=== L O O P ===
void loop() {
  AlphabetSoup();
}

Step 5: OUTPUT OF MY BUILD

THE OUTPUT OF MY BUILD 8X48 MATRIX SCROLL DISPLAY

4 People Made This Project!

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91 Discussions

0
None
OhmK1

11 months ago

What is power supply need for VCC in 74HC595 ic

2 replies
0
None
waheed1234

4 months ago

hi

i am using the same circuit and same code mentioned in the website,,,,,, kindly can any one help me how to add code for gsm sim 800l with the code given below. my email address is waheed1850@gmail.com

plz i need the same code with gsm 800L code ......thanks

int x;
int y;
int latchPin1 = 5; //Arduino pin connected to blue 12 RCLK of 74HC595
int clockPin1 = 6; //Arduino pin connected to green 11 SRCLK of 74HC595
int dataPin1 = 7; //Arduino pin connected to violet 14 SER of 74HC595

//-- Rows (Positive Anodes) --
int latchPin2 = 9; //Arduino pin connected to yellow Latch 12 RCLK of 74HC595
int clockPin2 = 10; //Arduino pin connected to white Clock 11 SRCLK of 74HC595
int dataPin2 = 8; //Arduino pin connected to grey Data 14 SER of 74HC595

//=== B I T M A P ===
//Bits in this array represents one LED of the matrix
// 8 is # of rows, 7 is # of LED matrix we have
byte bitmap[8][7]; // Change the 7 to however many matrices you want to use.
int numZones = sizeof(bitmap) / 8;
int maxZoneIndex = numZones-1;
int numCols = numZones * 8;

byte alphabets[][5] = {
{0,0,0,0,0},
{31, 36, 68, 36, 31},
{127, 73, 73, 73, 54},
{62, 65, 65, 65, 34},
{127, 65, 65, 34, 28},
{127, 73, 73, 65, 65},
{127, 72, 72, 72, 64},
{62, 65, 65, 69, 38},
{127, 8, 8, 8, 127},
{0, 65, 127, 65, 0},
{2, 1, 1, 1, 126},
{127, 8, 20, 34, 65},
{127, 1, 1, 1, 1},
{127, 32, 16, 32, 127},
{127, 32, 16, 8, 127},
{62, 65, 65, 65, 62},
{127, 72, 72, 72, 48},
{62, 65, 69, 66, 61},
{127, 72, 76, 74, 49},
{50, 73, 73, 73, 38},
{64, 64, 127, 64, 64},
{126, 1, 1, 1, 126},
{124, 2, 1, 2, 124},
{126, 1, 6, 1, 126},
{99, 20, 8, 20, 99},
{96, 16, 15, 16, 96},
{67, 69, 73, 81, 97},
};

//=== S E T U P ===

void setup() {
pinMode(latchPin1, OUTPUT);
pinMode(clockPin1, OUTPUT);
pinMode(dataPin1, OUTPUT);

pinMode(latchPin2, OUTPUT);
pinMode(clockPin2, OUTPUT);
pinMode(dataPin2, OUTPUT);

//-- Clear bitmap --
for (int row = 0; row > 8; row++) {
for (int zone = 0; zone <= maxZoneIndex; zone++) {
bitmap[row][zone] = 0;
}
}
}

//=== F U N C T I O N S ===
// This routine takes whatever we've setup in the bitmap array and display it on the matrix
void RefreshDisplay()
{
for (int row = 0; row < 8; row++) {
int rowbit = 1 << row;
digitalWrite(latchPin2, LOW); //Hold latchPin LOW for as long as we're transmitting data
shiftOut(dataPin2, clockPin2, MSBFIRST, rowbit); //Transmit data

//-- Start sending column bytes --
digitalWrite(latchPin1, LOW); //Hold latchPin LOW for as long as we're transmitting data

//-- Shift out to each matrix (zone is 8 columns represented by one matrix)
for (int zone = maxZoneIndex; zone >= 0; zone--) {
shiftOut(dataPin1, clockPin1, MSBFIRST, bitmap[row][zone]);
}

//-- Done sending Column bytes, flip both latches at once to eliminate flicker
digitalWrite(latchPin1, HIGH
digitalWrite(latchPin2, HIGH

//-- Wait a little bit to let humans see what we've pushed out onto the matrix --
delayMicroseconds(500);
}
}

// Converts row and colum to actual bitmap bit and turn it off/on
void Plot(int col, int row, bool isOn)
{
int zone = col / 8;
int colBitIndex = x % 8;
byte colBit = 1 << colBitIndex;
if (isOn)
bitmap[row][zone] = bitmap[y][zone] | colBit;
else
bitmap[row][zone] = bitmap[y][zone] & (~colBit);
}
// Plot each character of the message one column at a time, updated the display, shift bitmap left.
void AlphabetSoup()
{
char msg[] = "YOUR TEXT ";

for (int charIndex=0; charIndex < (sizeof(msg)-1); charIndex++)
{
int alphabetIndex = msg[charIndex] - '@';
if (alphabetIndex < 0) alphabetIndex=0;

//-- Draw one character of the message --
for (int col = 0; col < 6; col++)
{
for (int row = 0; row < 8; row++)
{
bool isOn = 0;
if (col<5) isOn = bitRead( alphabets[alphabetIndex][col], 7-row ) == 1;
Plot( numCols-1, row, isOn
}

//-- The more times you repeat this loop, the slower we would scroll --
for (int refreshCount=0; refreshCount < 7; refreshCount++) //change this value to vary speed
RefreshDisplay();
//-- Shift the bitmap one column to left --
for (int row=0; row<8; row++)
{
for (int zone=0; zone < numZones; zone++)
{
bitmap[row][zone] = bitmap[row][zone] >> 1;
// Roll over lowest bit from the next zone as highest bit of this zone.
if (zone < maxZoneIndex) bitWrite(bitmap[row][zone], 7,
bitRead(bitmap[row][zone+1],0));
}
}
}
}
}

//=== L O O P ===
void loop() {
AlphabetSoup();
}

0
None
ajaykarthick66

5 months ago on Step 5

hi sir ,

your makeing is excelent, but i need to increase the rows how is the way?

0
None
AnupamD6

9 months ago

How to increase the number or rows

0
None
SanR9

9 months ago

Hi admin

How many of LED in this project ?

1 reply
0
None
SriyanJSanR9

Reply 9 months ago

i have test below code with about 7000 leds

0
None
SriyanJ

3 years ago on Introduction

// Code With all characters and stoped scrolling (changed font) .

// Developer : Asela Jayathilaka on 04-28-2015.


int x;
int y;
int latchPin1 = 5; //Arduino pin connected to blue 12 RCLK of 74HC595
int clockPin1 = 6; //Arduino pin connected to green 11 SRCLK of 74HC595
int dataPin1 = 7; //Arduino pin connected to violet 14 SER of 74HC595

//-- Rows (Positive Anodes) --
int latchPin2 = 9; //Arduino pin connected to yellow Latch 12 RCLK of 74HC595
int clockPin2 = 10; //Arduino pin connected to white Clock 11 SRCLK of 74HC595
int dataPin2 = 8; //Arduino pin connected to grey Data 14 SER of 74HC595

//=== B I T M A P ===
//Bits in this array represents one LED of the matrix
// 8 is # of rows, 7 is # of LED matrix we have
byte bitmap[8][34]; // Change the 7 to however many matrices you want to use.
int numZones = sizeof(bitmap) / 8;
int maxZoneIndex = numZones-1;
int numCols = numZones * 8;

int rr=0;
uint8_t msg[34];
String msgs;

byte alphabets[][5] = {
0x00, 0x00, 0x00, 0x00, 0x00,// (space)
0x00, 0x00, 0x5F, 0x00, 0x00,// !
0x00, 0x07, 0x00, 0x07, 0x00,// "
0x14, 0x7F, 0x14, 0x7F, 0x14,// #
0x24, 0x2A, 0x7F, 0x2A, 0x12,// $
0x23, 0x13, 0x08, 0x64, 0x62,// %
0x36, 0x49, 0x55, 0x22, 0x50,// &
0x00, 0x05, 0x03, 0x00, 0x00,// '
0x00, 0x1C, 0x22, 0x41, 0x00,// (
0x00, 0x41, 0x22, 0x1C, 0x00,// )
0x08, 0x2A, 0x1C, 0x2A, 0x08,// *
0x08, 0x08, 0x3E, 0x08, 0x08,// +
0x00, 0x50, 0x30, 0x00, 0x00,// ,
0x08, 0x08, 0x08, 0x08, 0x08,// -
0x00, 0x60, 0x60, 0x00, 0x00,// .
0x20, 0x10, 0x08, 0x04, 0x02,// /
0x3E, 0x51, 0x49, 0x45, 0x3E,// 0
0x00, 0x42, 0x7F, 0x40, 0x00,// 1
0x42, 0x61, 0x51, 0x49, 0x46,// 2
0x21, 0x41, 0x45, 0x4B, 0x31,// 3
0x18, 0x14, 0x12, 0x7F, 0x10,// 4
0x27, 0x45, 0x45, 0x45, 0x39,// 5
0x3C, 0x4A, 0x49, 0x49, 0x30,// 6
0x01, 0x71, 0x09, 0x05, 0x03,// 7
0x36, 0x49, 0x49, 0x49, 0x36,// 8
0x06, 0x49, 0x49, 0x29, 0x1E,// 9
0x00, 0x36, 0x36, 0x00, 0x00,// :
0x00, 0x56, 0x36, 0x00, 0x00,// ;
0x00, 0x08, 0x14, 0x22, 0x41,// <
0x14, 0x14, 0x14, 0x14, 0x14,// =
0x41, 0x22, 0x14, 0x08, 0x00,// >
0x02, 0x01, 0x51, 0x09, 0x06,// ?
0x32, 0x49, 0x79, 0x41, 0x3E,// @
0x7E, 0x11, 0x11, 0x11, 0x7E,// A
0x7F, 0x49, 0x49, 0x49, 0x36,// B
0x3E, 0x41, 0x41, 0x41, 0x22,// C
0x7F, 0x41, 0x41, 0x22, 0x1C,// D
0x7F, 0x49, 0x49, 0x49, 0x41,// E
0x7F, 0x09, 0x09, 0x01, 0x01,// F
0x3E, 0x41, 0x41, 0x51, 0x32,// G
0x7F, 0x08, 0x08, 0x08, 0x7F,// H
0x00, 0x41, 0x7F, 0x41, 0x00,// I
0x20, 0x40, 0x41, 0x3F, 0x01,// J
0x7F, 0x08, 0x14, 0x22, 0x41,// K
0x7F, 0x40, 0x40, 0x40, 0x40,// L
0x7F, 0x02, 0x04, 0x02, 0x7F,// M
0x7F, 0x04, 0x08, 0x10, 0x7F,// N
0x3E, 0x41, 0x41, 0x41, 0x3E,// O
0x7F, 0x09, 0x09, 0x09, 0x06,// P
0x3E, 0x41, 0x51, 0x21, 0x5E,// Q
0x7F, 0x09, 0x19, 0x29, 0x46,// R
0x46, 0x49, 0x49, 0x49, 0x31,// S
0x01, 0x01, 0x7F, 0x01, 0x01,// T
0x3F, 0x40, 0x40, 0x40, 0x3F,// U
0x1F, 0x20, 0x40, 0x20, 0x1F,// V
0x7F, 0x20, 0x18, 0x20, 0x7F,// W
0x63, 0x14, 0x08, 0x14, 0x63,// X
0x03, 0x04, 0x78, 0x04, 0x03,// Y
0x61, 0x51, 0x49, 0x45, 0x43,// Z
0x00, 0x00, 0x7F, 0x41, 0x41,// [
0x02, 0x04, 0x08, 0x10, 0x20,// "\"
0x41, 0x41, 0x7F, 0x00, 0x00,// ]
0x04, 0x02, 0x01, 0x02, 0x04,// ^
0x40, 0x40, 0x40, 0x40, 0x40,// _
0x00, 0x01, 0x02, 0x04, 0x00,// `
0x20, 0x54, 0x54, 0x54, 0x78,// a
0x7F, 0x48, 0x44, 0x44, 0x38,// b
0x38, 0x44, 0x44, 0x44, 0x20,// c
0x38, 0x44, 0x44, 0x48, 0x7F,// d
0x38, 0x54, 0x54, 0x54, 0x18,// e
0x08, 0x7E, 0x09, 0x01, 0x02,// f
0x08, 0x14, 0x54, 0x54, 0x3C,// g
0x7F, 0x08, 0x04, 0x04, 0x78,// h
0x00, 0x44, 0x7D, 0x40, 0x00,// i
0x20, 0x40, 0x44, 0x3D, 0x00,// j
0x00, 0x7F, 0x10, 0x28, 0x44,// k
0x00, 0x41, 0x7F, 0x40, 0x00,// l
0x7C, 0x04, 0x18, 0x04, 0x78,// m
0x7C, 0x08, 0x04, 0x04, 0x78,// n
0x38, 0x44, 0x44, 0x44, 0x38,// o
0x7C, 0x14, 0x14, 0x14, 0x08,// p
0x08, 0x14, 0x14, 0x18, 0x7C,// q
0x7C, 0x08, 0x04, 0x04, 0x08,// r
0x48, 0x54, 0x54, 0x54, 0x20,// s
0x04, 0x3F, 0x44, 0x40, 0x20,// t
0x3C, 0x40, 0x40, 0x20, 0x7C,// u
0x1C, 0x20, 0x40, 0x20, 0x1C,// v
0x3C, 0x40, 0x30, 0x40, 0x3C,// w
0x44, 0x28, 0x10, 0x28, 0x44,// x
0x0C, 0x50, 0x50, 0x50, 0x3C,// y
0x44, 0x64, 0x54, 0x4C, 0x44,// z
0x00, 0x08, 0x36, 0x41, 0x00,// {
0x00, 0x00, 0x7F, 0x00, 0x00,// |
0x00, 0x41, 0x36, 0x08, 0x00,// }
0x08, 0x08, 0x2A, 0x1C, 0x08,// ->
0x08, 0x1C, 0x2A, 0x08, 0x08 // <-
};
/*
byte alphabets[][5] = {
{65,65,65,65,65},
{31, 36, 68, 36, 31},
{127, 73, 73, 73, 54},
{62, 65, 65, 65, 34},
{127, 65, 65, 34, 28},
{127, 73, 73, 65, 65},
{127, 72, 72, 72, 64},
{62, 65, 65, 69, 38},
{127, 8, 8, 8, 127},
{0, 65, 127, 65, 0},
{2, 1, 1, 1, 126},
{127, 8, 20, 34, 65},
{127, 1, 1, 1, 1},
{127, 32, 16, 32, 127},
{127, 32, 16, 8, 127},
{62, 65, 65, 65, 62},
{127, 72, 72, 72, 48},
{62, 65, 69, 66, 61},
{127, 72, 76, 74, 49},
{50, 73, 73, 73, 38},
{64, 64, 127, 64, 64},
{126, 1, 1, 1, 126},
{124, 2, 1, 2, 124},
{126, 1, 6, 1, 126},
{99, 20, 8, 20, 99},
{96, 16, 15, 16, 96},
{67, 69, 73, 81, 97},
};
*/

//=== S E T U P ===

void setup() {
Serial.begin(9600);
pinMode(latchPin1, OUTPUT);
pinMode(clockPin1, OUTPUT);
pinMode(dataPin1, OUTPUT);

pinMode(latchPin2, OUTPUT);
pinMode(clockPin2, OUTPUT);
pinMode(dataPin2, OUTPUT);



//-- Clear bitmap --
for (int row = 0; row > 8; row++) {
for (int zone = 0; zone <= maxZoneIndex; zone++) {
bitmap[row][zone] = 0;
}
}
}

//=== F U N C T I O N S ===
// This routine takes whatever we've setup in the bitmap array and display it on the matrix
void RefreshDisplay()
{
for (int row = 0; row < 8; row++) {
int rowbit = 1 << row;
digitalWrite(latchPin2, LOW); //Hold latchPin LOW for as long as we're transmitting data
shiftOut(dataPin2, clockPin2, MSBFIRST, rowbit); //Transmit data

//-- Start sending column bytes --
digitalWrite(latchPin1, LOW); //Hold latchPin LOW for as long as we're transmitting data

//-- Shift out to each matrix (zone is 8 columns represented by one matrix)
for (int zone = maxZoneIndex; zone >= 0; zone--) {
shiftOut(dataPin1, clockPin1, MSBFIRST, bitmap[row][zone]);
}

//-- Done sending Column bytes, flip both latches at once to eliminate flicker
digitalWrite(latchPin1, HIGH);
digitalWrite(latchPin2, HIGH);

//-- Wait a little bit to let humans see what we've pushed out onto the matrix --
delayMicroseconds(100);
//delay(1) ;
}
}

// Converts row and colum to actual bitmap bit and turn it off/on
void Plot(int col, int row, bool isOn)
{
int zone = col / 8;
int colBitIndex = x % 8;
byte colBit = 1 << colBitIndex;
if (isOn)
bitmap[row][zone] = bitmap[y][zone] | colBit;
else
bitmap[row][zone] = bitmap[y][zone] & (~colBit);
}
// Plot each character of the message one column at a time, updated the display, shift bitmap left.
void AlphabetSoup()
{
if (rr<2){

// char msg[] = "12345678901011121314151617";


for (int charIndex=0; charIndex < (sizeof(msg)-1); charIndex++)
{
int alphabetIndex = msg[charIndex] - ' ';
if (alphabetIndex < 0) alphabetIndex=0;

//-- Draw one character of the message --
for (int col = 0; col < 6; col++)
{
for (int row = 0; row < 8; row++)
{
bool isOn = 0;
if (col<5) isOn = bitRead( alphabets[alphabetIndex][col], 7-row ) == 1;
Plot( numCols-1, row, isOn);
}

//-- The more times you repeat this loop, the slower we would scroll --
for (int refreshCount=0; refreshCount < 1; refreshCount++) //change this value to vary speed
// RefreshDisplay();
//-- Shift the bitmap one column to left --
for (int row=0; row<8; row++)
{
for (int zone=0; zone < numZones; zone++)
{
bitmap[row][zone] = bitmap[row][zone] >> 1;
// Roll over lowest bit from the next zone as highest bit of this zone.
if (zone < maxZoneIndex) bitWrite(bitmap[row][zone], 7,
bitRead(bitmap[row][zone+1],0));
}
}
}
}
}
rr++;
}

//=== L O O P ===
void loop() {




// if (rr<2){
AlphabetSoup();
// }
//rr++;
for (int r = 0; r<10; r++){
RefreshDisplay();
//delay(100);
}
}

1 reply
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anilr48SriyanJ

Reply 11 months ago

This code is working but letters are coming up side down what might be problem

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azadbd

1 year ago

I can't program with this code. Here show error with "digitalWrite(latchPin2," HIGH

1 reply
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azadbd

1 year ago

please help me

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prashanthjf

1 year ago

Hi sir , my project is on GSM and Arduino Based Electronic notice board with scrolling led matrix . Is this code helpful to me??

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iroko1

1 year ago

please, i connected this your code well but it is displaying. can you guide me on what to do

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ZafarD

3 years ago

very nice..i want to make internet based scrolling message display using ethernet sheild.

2 replies
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rahulr31ZafarD

Reply 1 year ago

yo must should go with raspberry pi then

0
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shashiumZafarD

Reply 1 year ago

hello sir, I have to do this project, scrolling led matrix using arduino ethernet sheild. can you help me? can you please send me code (I am not good in programming) ?

please reply me shashibhushan3535@gmail.com

0
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kashishgupta

1 year ago

i have connected cathodes along rows and anodes along columns and the words are shown inverted and there is no proper formation of words. sir help me so that i can correct it by programming rather than changing the circuit. please do reply on my email. email:- kg2276@gmail.com