700x5 LED Scrolling Matrix

John_Cairns · June 19, 2018, 1:20am

Hello,

Creating a 700x5 LED Scrolling Matrix following https://www.instructables.com/id/48x8-SCROLLING-MATRIX-LED-DISPLAY-USING-ARDUINO-CO/ schematic and code. The modified schematic worked well but no matter how much I play with and update the code; there is no getting the code to cooperate with the 700x5 schematic. I have hit a road block.
I appreciate any support/advice you may have with updating the code:

[color=#555555]int x;[/color]
[color=#555555]int y;[/color]
[color=#555555]int latchPin1 = 5; //Arduino pin connected to blue 12 RCLK of 74HC595[/color]
[color=#555555]int clockPin1 = 6; //Arduino pin connected to green 11 SRCLK of 74HC595[/color]
[color=#555555]int dataPin1 = 7;  //Arduino pin connected to violet 14 SER of 74HC595[/color]

[color=#555555]//-- Rows (Positive Anodes) --[/color]
[color=#555555]int latchPin2 = 9; //Arduino pin connected to yellow Latch 12 RCLK of 74HC595[/color]
[color=#555555]int clockPin2 = 10; //Arduino pin connected to white Clock 11 SRCLK of 74HC595[/color]
[color=#555555]int dataPin2 = 8;  //Arduino pin connected to grey Data 14 SER of 74HC595[/color]

[color=#555555]//=== B I T M A P ===[/color]
[color=#555555]//Bits in this array represents one LED of the matrix[/color]
[color=#555555]// 8 is # of rows, 7 is # of LED matrix we have[/color]
[color=#555555]byte bitmap[8][7]; // Change the 7 to however many matrices you want to use.[/color]
[color=#555555]int numZones = sizeof(bitmap) / 8;[/color]
[color=#555555]int maxZoneIndex = numZones-1;[/color]
[color=#555555]int numCols = numZones * 8;[/color]

[color=#555555]byte alphabets[][5] = {[/color]
[color=#555555] {0,0,0,0,0},[/color]
[color=#555555] {31, 36, 68, 36, 31},[/color]
[color=#555555] {127, 73, 73, 73, 54},[/color]
[color=#555555] {62, 65, 65, 65, 34},[/color]
[color=#555555] {127, 65, 65, 34, 28},[/color]
[color=#555555] {127, 73, 73, 65, 65},[/color]
[color=#555555] {127, 72, 72, 72, 64},[/color]
[color=#555555] {62, 65, 65, 69, 38},[/color]
[color=#555555] {127, 8, 8, 8, 127},[/color]
[color=#555555] {0, 65, 127, 65, 0},[/color]
[color=#555555] {2, 1, 1, 1, 126},[/color]
[color=#555555] {127, 8, 20, 34, 65},[/color]
[color=#555555] {127, 1, 1, 1, 1},[/color]
[color=#555555] {127, 32, 16, 32, 127},[/color]
[color=#555555] {127, 32, 16, 8, 127},[/color]
[color=#555555] {62, 65, 65, 65, 62},[/color]
[color=#555555] {127, 72, 72, 72, 48},[/color]
[color=#555555] {62, 65, 69, 66, 61},[/color]
[color=#555555] {127, 72, 76, 74, 49},[/color]
[color=#555555] {50, 73, 73, 73, 38},[/color]
[color=#555555] {64, 64, 127, 64, 64},[/color]
[color=#555555] {126, 1, 1, 1, 126},[/color]
[color=#555555] {124, 2, 1, 2, 124},[/color]
[color=#555555] {126, 1, 6, 1, 126},[/color]
[color=#555555] {99, 20, 8, 20, 99},[/color]
[color=#555555] {96, 16, 15, 16, 96},[/color]
[color=#555555] {67, 69, 73, 81, 97},[/color]
[color=#555555]};[/color]

[color=#555555]//=== S E T U P ===[/color]

[color=#555555]void setup() {[/color]
[color=#555555] pinMode(latchPin1, OUTPUT);[/color]
[color=#555555] pinMode(clockPin1, OUTPUT);[/color]
[color=#555555] pinMode(dataPin1, OUTPUT);[/color]

[color=#555555] pinMode(latchPin2, OUTPUT);[/color]
[color=#555555] pinMode(clockPin2, OUTPUT);[/color]
[color=#555555] pinMode(dataPin2, OUTPUT);[/color]

[color=#555555] //-- Clear bitmap --[/color]
[color=#555555] for (int row = 0; row > 8; row++) {[/color]
[color=#555555]   for (int zone = 0; zone <= maxZoneIndex; zone++) {[/color]
[color=#555555]     bitmap[row][zone] = 0;[/color]
[color=#555555]   }[/color]
[color=#555555] }[/color]
[color=#555555]}[/color]

[color=#555555]//=== F U N C T I O N S ===[/color]
[color=#555555]// This routine takes whatever we've setup in the bitmap array and display it on the matrix[/color]
[color=#555555]void RefreshDisplay()[/color]
[color=#555555]{[/color]
[color=#555555] for (int row = 0; row < 8; row++) {[/color]
[color=#555555]   int rowbit = 1 << row;[/color]
[color=#555555]   digitalWrite(latchPin2, LOW);  //Hold latchPin LOW for as long as we're transmitting data[/color]
[color=#555555]   shiftOut(dataPin2, clockPin2, MSBFIRST, rowbit);   //Transmit data[/color]

[color=#555555]   //-- Start sending column bytes --[/color]
[color=#555555]   digitalWrite(latchPin1, LOW);  //Hold latchPin LOW for as long as we're transmitting data[/color]

[color=#555555]   //-- Shift out to each matrix (zone is 8 columns represented by one matrix)[/color]
[color=#555555]   for (int zone = maxZoneIndex; zone >= 0; zone--) {[/color]
[color=#555555]     shiftOut(dataPin1, clockPin1, MSBFIRST, bitmap[row][zone]);[/color]
[color=#555555]   }[/color]

[color=#555555]   //-- Done sending Column bytes, flip both latches at once to eliminate flicker[/color]
[color=#555555]   digitalWrite(latchPin1, HIGH[/color]
[color=#555555]   digitalWrite(latchPin2, HIGH[/color]

[color=#555555]   //-- Wait a little bit to let humans see what we've pushed out onto the matrix --[/color]
[color=#555555]   delayMicroseconds(500);[/color]
[color=#555555] }[/color]
[color=#555555]}[/color]

[color=#555555]// Converts row and colum to actual bitmap bit and turn it off/on[/color]
[color=#555555]void Plot(int col, int row, bool isOn)[/color]
[color=#555555]{[/color]
[color=#555555] int zone = col / 8;[/color]
[color=#555555] int colBitIndex = x % 8;[/color]
[color=#555555] byte colBit = 1 << colBitIndex;[/color]
[color=#555555] if (isOn)[/color]
[color=#555555]   bitmap[row][zone] =  bitmap[y][zone] | colBit;[/color]
[color=#555555] else[/color]
[color=#555555]   bitmap[row][zone] =  bitmap[y][zone] & (~colBit);[/color]
[color=#555555]}[/color]
[color=#555555]// Plot each character of the message one column at a time, updated the display, shift bitmap left.[/color]
[color=#555555]void AlphabetSoup()[/color]
[color=#555555]{[/color]
[color=#555555] char msg[] = "YOUR TEXT ";[/color]

[color=#555555] for (int charIndex=0; charIndex < (sizeof(msg)-1); charIndex++)[/color]
[color=#555555] {[/color]
[color=#555555]   int alphabetIndex = msg[charIndex] - '@';[/color]
[color=#555555]   if (alphabetIndex < 0) alphabetIndex=0;[/color]
  
[color=#555555]   //-- Draw one character of the message --[/color]
[color=#555555]   for (int col = 0; col < 6; col++)[/color]
[color=#555555]   {[/color]
[color=#555555]     for (int row = 0; row < 8; row++)[/color]
[color=#555555]     {[/color]
[color=#555555]       bool isOn = 0;[/color]
[color=#555555]       if (col<5) isOn = bitRead( alphabets[alphabetIndex][col], 7-row ) == 1;[/color]
[color=#555555]       Plot( numCols-1, row, isOn[/color]
[color=#555555]     }[/color]
    
[color=#555555]     //-- The more times you repeat this loop, the slower we would scroll --[/color]
[color=#555555]     for (int refreshCount=0; refreshCount < 7; refreshCount++) //change  this value to vary speed[/color]
[color=#555555]       RefreshDisplay();[/color]
[color=#555555]     //-- Shift the bitmap one column to left --[/color]
[color=#555555]     for (int row=0; row<8; row++)[/color]
[color=#555555]     {[/color]
[color=#555555]       for (int zone=0; zone < numZones; zone++)[/color]
[color=#555555]       {[/color]
[color=#555555]         bitmap[row][zone] = bitmap[row][zone] >> 1;[/color]
[color=#555555]                   // Roll over lowest bit from the next zone as highest bit of this zone.[/color]
[color=#555555]         if (zone < maxZoneIndex) bitWrite(bitmap[row][zone], 7,[/color]
[color=#555555]bitRead(bitmap[row][zone+1],0));[/color]
[color=#555555]       }[/color]
[color=#555555]     }[/color]
[color=#555555]   }[/color]
[color=#555555] }[/color]
[color=#555555]}[/color]

[color=#555555]//=== L O O P ===[/color]
[color=#555555]void loop() {[/color]
[color=#555555] AlphabetSoup();[/color]
[color=#555555]}[/color]

Shuzz · June 19, 2018, 11:52am

Please put your code in code tags, it makes it much easier to read.

The code does some things in an overly complicated way, such as trying to latch both latch pins at once.
That is absolutely unnecessary.

You should look up what the output enable pin does on your shift registers and connect that to your controller.
Then, wire up the line register in series with the column registers so you only have one big chain to take care of. Once you sent out all the data, disable the outputs on your shift registers using the OE pin, then latch the new data and enable the outputs again. Much easier to do and guaranteed to be without ghosting.

Also, when you say that you have problems in getting the code to cooperate, what exactly does not work and in which way does it not work? The more details the better...

John_Cairns · June 20, 2018, 1:10am

Hi Shuzz,
Thank you for the comments and advice. I greatly appreciate the recommendations to put code in code tags and provide details about issues for troubleshooting.
I am giving your thoughts a shot and I will be sure to provide any updates.

Thanks again

anon13120794 · June 20, 2018, 1:45am

Read the documentation of your shift registers. It should include a diagram on how to daisy chain them so you only have to worry about one shift register. It shifts out the data to the next, passing it along.

Don't forget a big power supply. You'll need it.

John_Cairns · June 21, 2018, 12:45am

Thanks Unassigned Arduino

Grumpy_Mike · June 21, 2018, 4:38am

John_Cairns:
Hi Shuzz,
Thank you for the comments and advice. I greatly appreciate the recommendations to put code in code tags

Then why have you not done this. You can edit your post you know.

PaulRB · June 21, 2018, 7:18am

Grumpy_Mike:
Then why have you not done this. You can edit your post you know.

I don't think John has figured out what code tags are yet. He may think it is something that he hopes will fix his code, once he has researched it.

John, code tags are used simply to make your code readable when posted on this forum. Without them, the forum may corrupt the code you post. Read the forum guidelines in the sticky post to find out how, and other useful tips on how to get the best help from this forum (and avoid pissing off the other forum members!).

anon13120794 · June 26, 2018, 4:47pm

What happens when the code runs? Nothing happens? If yes, use the Serial monitor to see what happens.
Does your Arduino actually power up? Check with another Arduino. Have your pins been fried? Test with LEDS plus resistors.

Maybe your power supply cannot supply that much current. LEDs can draw lots of current.

Test with a multimeter to find out how much current your project needs and check if the power supply is capable of providing that much current.

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700x5 LED Scrolling Matrix

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