Dot Matrix 8×8 MAX7219 Dot Led Matrix Module MCU Control LED Display Module
Features of Dot Matrix 8×8 MAX7219:
- A single module can drive an 8 x 8 common cathode lattice
- With four 3mm screw?holes
- Module with input and output interface, supports multiple modules cascade
Specifications:
- Working Voltage: 5V DC
- Size: 5cm(L) X 3.2cm(W) X 1.5cm(H)
Connect Dot Matrix to Arduino
The program was based on the?basic Arduino?book, author?Michael McRoberts,?with minor changes and adaptations. Load the program in Arduino changing the message lines, as indicated by the program to display the information you want:// Program: horizontal Scrool with LED matrix 8x8 // Arduino and Co. ? ? #include <pgmspace.h> ? #include <TimerOne.h> ? ? ? int DataPin = 4; ?// Connect DIN to pin 4 int ClockPin = 5; // Connect CLK to pin 5 int LoadPin = 6; ?// Connect CS/Load to pin 6 ?? byte buffer8; ? ? ? static byte font[]8 PROGMEM = { ? {B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000}, ?? {B00000100, B00000100, B00000100, B00000100, B00000100, B00000100, B00000000, B00000100}, ?? {B00001010, B00001010, B00001010, B00000000, B00000000, B00000000, B00000000, B00000000}, ?? {B00000000, B00001010, B00011111, B00001010, B00011111, B00001010, B00011111, B00001010}, ?? {B00000111, B00001100, B00010100, B00001100, B00000110, B00000101, B00000110, B00011100}, ?? {B00011001, B00011010, B00000010, B00000100, B00000100, B00001000, B00001011, B00010011}, ?? {B00000110, B00001010, B00010010, B00010100, B00001001, B00010110, B00010110, B00001001}, ?? {B00000100, B00000100, B00000100, B00000000, B00000000, B00000000, B00000000, B00000000}, ?? {B00000010, B00000100, B00001000, B00001000, B00001000, B00001000, B00000100, B00000010}, ?? {B00001000, B00000100, B00000010, B00000010, B00000010, B00000010, B00000100, B00001000}, ?? {B00010101, B00001110, B00011111, B00001110, B00010101, B00000000, B00000000, B00000000}, ?? {B00000000, B00000000, B00000100, B00000100, B00011111, B00000100, B00000100, B00000000}, ?? {B00000000, B00000000, B00000000, B00000000, B00000000, B00000110, B00000100, B00001000}, ?? {B00000000, B00000000, B00000000, B00000000, B00001110, B00000000, B00000000, B00000000}, ?? {B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000100}, ?? {B00000001, B00000010, B00000010, B00000100, B00000100, B00001000, B00001000, B00010000}, ?? {B00001110, B00010001, B00010011, B00010001, B00010101, B00010001, B00011001, B00001110}, ?? {B00000100, B00001100, B00010100, B00000100, B00000100, B00000100, B00000100, B00011111}, ?? {B00001110, B00010001, B00010001, B00000010, B00000100, B00001000, B00010000, B00011111}, ?? {B00001110, B00010001, B00000001, B00001110, B00000001, B00000001, B00010001, B00001110}, ?? {B00010000, B00010000, B00010100, B00010100, B00011111, B00000100, B00000100, B00000100}, ?? {B00011111, B00010000, B00010000, B00011110, B00000001, B00000001, B00000001, B00011110}, ?? {B00000111, B00001000, B00010000, B00011110, B00010001, B00010001, B00010001, B00001110}, ?? {B00011111, B00000001, B00000001, B00000001, B00000010, B00000100, B00001000, B00010000}, ?? {B00001110, B00010001, B00010001, B00001110, B00010001, B00010001, B00010001, B00001110}, ?? {B00001110, B00010001, B00010001, B00001111, B00000001, B00000001, B00000001, B00000001}, ?? {B00000000, B00000100, B00000100, B00000000, B00000000, B00000100, B00000100, B00000000}, ?? {B00000000, B00000100, B00000100, B00000000, B00000000, B00000100, B00000100, B00001000}, ?? {B00000001, B00000010, B00000100, B00001000, B00001000, B00000100, B00000010, B00000001}, ?? {B00000000, B00000000, B00000000, B00011110, B00000000, B00011110, B00000000, B00000000}, ?? {B00010000, B00001000, B00000100, B00000010, B00000010, B00000100, B00001000, B00010000}, ?? {B00001110, B00010001, B00010001, B00000010, B00000100, B00000100, B00000000, B00000100}, ?? {B00001110, B00010001, B00010001, B00010101, B00010101, B00010001, B00010001, B00011110}, ?? {B00001110, B00010001, B00010001, B00010001, B00011111, B00010001, B00010001, B00010001}, ?? {B00011110, B00010001, B00010001, B00011110, B00010001, B00010001, B00010001, B00011110}, ?? {B00000111, B00001000, B00010000, B00010000, B00010000, B00010000, B00001000, B00000111}, ?? {B00011100, B00010010, B00010001, B00010001, B00010001, B00010001, B00010010, B00011100}, ? {B00011111, B00010000, B00010000, B00011110, B00010000, B00010000, B00010000, B00011111}, ?? {B00011111, B00010000, B00010000, B00011110, B00010000, B00010000, B00010000, B00010000}, ?? {B00001110, B00010001, B00010000, B00010000, B00010111, B00010001, B00010001, B00001110}, ?? {B00010001, B00010001, B00010001, B00011111, B00010001, B00010001, B00010001, B00010001}, ?? {B00011111, B00000100, B00000100, B00000100, B00000100, B00000100, B00000100, B00011111}, ?? {B00011111, B00000100, B00000100, B00000100, B00000100, B00000100, B00010100, B00001000}, ?? {B00010001, B00010010, B00010100, B00011000, B00010100, B00010010, B00010001, B00010001}, ?? {B00010000, B00010000, B00010000, B00010000, B00010000, B00010000, B00010000, B00011111}, ?? {B00010001, B00011011, B00011111, B00010101, B00010001, B00010001, B00010001, B00010001}, ?? {B00010001, B00011001, B00011001, B00010101, B00010101, B00010011, B00010011, B00010001}, ?? {B00001110, B00010001, B00010001, B00010001, B00010001, B00010001, B00010001, B00001110}, ?? {B00011110, B00010001, B00010001, B00011110, B00010000, B00010000, B00010000, B00010000}, ?? {B00001110, B00010001, B00010001, B00010001, B00010001, B00010101, B00010011, B00001111}, ?? {B00011110, B00010001, B00010001, B00011110, B00010100, B00010010, B00010001, B00010001}, ?? {B00001110, B00010001, B00010000, B00001000, B00000110, B00000001, B00010001, B00001110}, ?? {B00011111, B00000100, B00000100, B00000100, B00000100, B00000100, B00000100, B00000100}, ?? {B00010001, B00010001, B00010001, B00010001, B00010001, B00010001, B00010001, B00001110}, ?? {B00010001, B00010001, B00010001, B00010001, B00010001, B00010001, B00001010, B00000100}, ?? {B00010001, B00010001, B00010001, B00010001, B00010001, B00010101, B00010101, B00001010}, ?? {B00010001, B00010001, B00001010, B00000100, B00000100, B00001010, B00010001, B00010001}, ?? {B00010001, B00010001, B00001010, B00000100, B00000100, B00000100, B00000100, B00000100}, ?? {B00011111, B00000001, B00000010, B00000100, B00001000, B00010000, B00010000, B00011111}, ?? {B00001110, B00001000, B00001000, B00001000, B00001000, B00001000, B00001000, B00001110}, ?? {B00010000, B00001000, B00001000, B00000100, B00000100, B00000010, B00000010, B00000001}, ?? {B00001110, B00000010, B00000010, B00000010, B00000010, B00000010, B00000010, B00001110}, ?? {B00000100, B00001010, B00010001, B00000000, B00000000, B00000000, B00000000, B00000000}, ?? {B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000, B00011111}, ?? {B00001000, B00000100, B00000000, B00000000, B00000000, B00000000, B00000000, B00000000}, ?? {B00000000, B00000000, B00000000, B00001110, B00010010, B00010010, B00010010, B00001111}, ?? {B00000000, B00010000, B00010000, B00010000, B00011100, B00010010, B00010010, B00011100}, ?? {B00000000, B00000000, B00000000, B00001110, B00010000, B00010000, B00010000, B00001110}, ?? {B00000000, B00000001, B00000001, B00000001, B00000111, B00001001, B00001001, B00000111}, ?? {B00000000, B00000000, B00000000, B00011100, B00010010, B00011110, B00010000, B00001110}, ?? {B00000000, B00000011, B00000100, B00000100, B00000110, B00000100, B00000100, B00000100}, ?? {B00000000, B00001110, B00001010, B00001010, B00001110, B00000010, B00000010, B00001100}, ?? {B00000000, B00010000, B00010000, B00010000, B00011100, B00010010, B00010010, B00010010}, ?? {B00000000, B00000000, B00000100, B00000000, B00000100, B00000100, B00000100, B00000100}, ?? {B00000000, B00000010, B00000000, B00000010, B00000010, B00000010, B00000010, B00001100}, ?? {B00000000, B00010000, B00010000, B00010100, B00011000, B00011000, B00010100, B00010000}, ?? {B00000000, B00010000, B00010000, B00010000, B00010000, B00010000, B00010000, B00001100}, ?? {B00000000, B00000000, B00000000, B00001010, B00010101, B00010001, B00010001, B00010001}, ?? {B00000000, B00000000, B00000000, B00010100, B00011010, B00010010, B00010010, B00010010}, ?? {B00000000, B00000000, B00000000, B00001100, B00010010, B00010010, B00010010, B00001100}, ?? {B00000000, B00011100, B00010010, B00010010, B00011100, B00010000, B00010000, B00010000}, ?? {B00000000, B00001110, B00010010, B00010010, B00001110, B00000010, B00000010, B00000001}, ?? {B00000000, B00000000, B00000000, B00001010, B00001100, B00001000, B00001000, B00001000}, ?? {B00000000, B00000000, B00001110, B00010000, B00001000, B00000100, B00000010, B00011110}, ?? {B00000000, B00010000, B00010000, B00011100, B00010000, B00010000, B00010000, B00001100}, ?? {B00000000, B00000000, B00000000, B00010010, B00010010, B00010010, B00010010, B00001100}, ?? {B00000000, B00000000, B00000000, B00010001, B00010001, B00010001, B00001010, B00000100}, ?? {B00000000, B00000000, B00000000, B00010001, B00010001, B00010001, B00010101, B00001010}, ?? {B00000000, B00000000, B00000000, B00010001, B00001010, B00000100, B00001010, B00010001}, ?? {B00000000, B00000000, B00010001, B00001010, B00000100, B00001000, B00001000, B00010000}, ?? {B00000000, B00000000, B00000000, B00011111, B00000010, B00000100, B00001000, B00011111}, ?? {B00000010, B00000100, B00000100, B00000100, B00001000, B00000100, B00000100, B00000010}, ?? {B00000100, B00000100, B00000100, B00000100, B00000100, B00000100, B00000100, B00000100}, ?? {B00001000, B00000100, B00000100, B00000100, B00000010, B00000100, B00000100, B00001000}, ?? {B00000000, B00000000, B00000000, B00001010, B00011110, B00010100, B00000000, B00000000} ?? }; ? ? ? void clearDisplay()? { ? ? for (byte x=0; x<8; x )? ? ? { ? ? ? ? ?buffer[x] = B00000000; ? ? ? } ? ? ? screenUpdate(); ? } ? ?? void initMAX7219()? { ? ? ? pinMode(DataPin, OUTPUT); ? ? ? pinMode(LoadPin, OUTPUT); ? ? ? pinMode(ClockPin, OUTPUT); ? ? ? clearDisplay(); ? ? ? writeData(B00001011, B00000111); ?? ? ? writeData(B00001001, B00000000); ?? ? ? writeData(B00001100, B00000001); ?? ? ? intensity(1); ?? } ? ? ? void intensity(int intensity)? { ? ? ? writeData(B00001010, intensity); ?? } ? ? ? void writeData(byte MSB, byte LSB)? { ? ? ? byte mask; ? ? ? digitalWrite(LoadPin, LOW); ?? ? ? ?? ? ? for (mask = B10000000; mask>0; mask >>= 1)? ? ? { ?? ? ? ? ? digitalWrite(ClockPin, LOW); ? ? ? ? ? if (MSB & mask) ? ? ? ? { ?? ? ? ? ? ? ?digitalWrite(DataPin,HIGH); ?? ? ? ? ? } ? ? ? ? ? else ? ? ? ? { ?? ? ? ? ? ? ?digitalWrite(DataPin,LOW); ?? ? ? ? ? } ? ? ? ? ? digitalWrite(ClockPin, HIGH); ?? ? ? } ? ? ? ?? ? ? for (mask = B10000000; mask>0; mask >>= 1)? ? ? { ?? ? ? ? ? digitalWrite(ClockPin, LOW); ? ? ? ? ? if (LSB & mask) ? ? ? ? { ?? ? ? ? ? ? ?digitalWrite(DataPin,HIGH); ?? ? ? ? ? } ? ? ? ? ? else ? ? ? ? { ?? ? ? ? ? ? ? digitalWrite(DataPin,LOW); ?? ? ? ? ? } ? ? ? ? ? digitalWrite(ClockPin, HIGH); ?? ? ? } ? ? ? digitalWrite(LoadPin, HIGH); ?? ? ? digitalWrite(ClockPin, LOW); ? } ? ? ? void scroll(char myString[], int speed)? { ? ? ? byte firstChrRow, secondChrRow; ? ? ? byte ledOutput; ? ? ? byte chrPointer = 0; ?? ? ? byte Char1, Char2; ?? ? ? byte scrollBit = 0; ? ? ? byte strLength = 0; ? ? ? unsigned long time; ? ? ? unsigned long counter; ? ? ? ? ? ? ? while (myString[strLength]) {strLength ;} ? ? ? counter = millis(); ? ? ? while (chrPointer < (strLength-1))? ? ? { ? ? ? ? ?time = millis(); ? ? ? ? ?if (time > (counter speed))? ? ? ? ?{? ? ? ? ? ? Char1 = myString[chrPointer]; ? ? ? ? ? ? Char2 = myString[chrPointer 1]; ? ? ? ? ? ? for (byte y= 0; y<8; y )? ? ? ? ? ? { ? ? ? ? ? ? ? firstChrRow = pgm_read_byte(&font[Char1 - 32][y]); ? ? ? ? ? ? ? secondChrRow = (pgm_read_byte(&font[Char2 - 32][y])) << 1; ? ? ? ? ? ? ? ledOutput = (firstChrRow << scrollBit) | (secondChrRow >> (8 - scrollBit) ); ? ? ? ? ? ? ? buffer[y] = ledOutput; ? ? ? ? ? ? } ? ? ? ? ? ? ? scrollBit ; ?? ? ? ? ? ? ? if (scrollBit > 6)? ? ? ? ? ? ? { ?? ? ? ? ? ? ? ? scrollBit = 0; ? ? ? ? ? ? ? ? chrPointer ; ? ? ? ? ? ? ? } ? ? ? ? ? ? ? counter = millis(); ? ? ? ? ? } ? ? ? } ? } ? ? ? void screenUpdate()? { ? ? ?for (byte row = 0; row < 8; row )? ? ?{? ? ? ? writeData(row 1, buffer[row]); ? ? ?} ? } ? ? ? void setup()? { ? ? ?initMAX7219(); ? ? ?Timer1.initialize(10000); ? ? ?? ? ?Timer1.attachInterrupt(screenUpdate); ?? } ? ?? void loop()? { ? ? ?clearDisplay(); ? ? ? ?scroll(" Arduino: ", 100);?// Display the message to scroll range of 100 ? ?scroll(" - 2013 ", 100); // Add more lines to show other characters }
