8x8 Scrolling LED display (Simple example) - Page 2


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  1. #41
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    Default Re: 8x8 Scrolling LED display (Simple example)

    yes that is a great idea, going to google for samples of 4049!thx

  2. #42
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    Default Re: 8x8 Scrolling LED display (Simple example)

    here is the final result, the message is Baby on Board on my native language (bosnian)



    the code is made in ProtonIde compiler and is similar to PBP hope someone will use it

    Code:
    		 '****************************************************************
    
    ' SIMPLE 15X8 LED MATRIX SCROLLING EXAMPLE
    ' 16F877A External 8MHz Xtal Osc
    ' LED Matrix columns are conected to PORTC pin rc0 via ULN2004AN and CD4017.
    ' RC1 reset for 4017
    ' LED Matrix rows conected to PORTB via 100 ohm resistors 
    ' RB0 - top row
    ' Author: Muamer Halilovic
    ' www.mtskola.com
    ' today
    '***************************************************************************************
    Device 16F877A
    Xtal 12
    TRISB = %00000000
    TRISC = %10000000
    TRISD = %00000000
    PORTB=0
    PORTC=0
    PORTD=0
    All_Digital = True
      
    	EWrite 0,[%00000100,%00000110,%01111111,%00000110,%00000100]	'Up Arrow
    	EWrite 5,[%00010000,%00110000,%01111111,%00110000,%00010000]	'Dn Arrow
    	EWrite 10,[%01111110,%00010001,%00010001,%00010001,%01111110]	'A
    	EWrite 15,[%01111111,%01001001,%01001001,%01001001,%00110110]	'B
    	EWrite 20,[%00111110,%01000001,%01000001,%01000001,%00100010]	'C
    	EWrite 25,[%01111111,%01000001,%01000001,%00100010,%00011100]	'D
    	EWrite 30,[%01111111,%01001001,%01001001,%01001001,%01000001]	'E
    	EWrite 35,[%01111111,%00001001,%00001001,%00001001,%00000001]	'F
    	EWrite 40,[%00111110,%01000001,%01001001,%01001001,%01111010]	'G
    	EWrite 45,[%01111111,%00001000,%00001000,%00001000,%01111111]	'H
    	EWrite 50,[%00000000,%01000001,%01111111,%01000001,%00000000]	'I
    	EWrite 55,[%00100000,%01000000,%01000001,%00111111,%00000001]	'J
    	EWrite 60,[%01111111,%00001000,%00010100,%00100010,%01000001]	'K
    	EWrite 65,[%01111111,%01000000,%01000000,%01000000,%01000000]	'L
    	EWrite 70,[%01111111,%00000010,%00000110,%00000010,%01111111]	'M
    	EWrite 75,[%01111111,%00000100,%00001000,%00010000,%01111111]	'N
    	EWrite 80,[%00111110,%01000001,%01000001,%01000001,%00111110]	'O
    	EWrite 85,[%01111111,%00001001,%00001001,%00001001,%00000110]	'P
    	EWrite 90,[%01111111,%00001001,%00011001,%00101001,%01000110]	'R
    	EWrite 95,[%01000110,%01001001,%01001001,%01001001,%00110001]	'S
    	EWrite 100,[%00000001,%00000001,%01111111,%00000001,%00000001]	'T
    	EWrite 105,[%00111111,%01000000,%01000000,%01000000,%00111111]	'U
    	EWrite 110,[%00011111,%00100000,%01000000,%00100000,%00011111]	'V
    	EWrite 115,[$00,$00,$00,$00,$00]	'blank space
    	EWrite 185,[$00,$00,$00,$00,$00]
    	EWrite 190,[$00,$00,$00,$00,$00]
    	EWrite 195,[$00,$00,$00,$00,$00]
    	EWrite 200,[$00,$00,$00,$00,$00]
    	EWrite 205,[$00,$00,$00,$00,$00]
    	EWrite 210,[$00,$00,$00,$00,$00]
    	EWrite 215,[$00,$00,$00,$00,$00]
    	EWrite 220,[$00,$00,$00,$00,$00]
    	EWrite 225,[$00,$00,$00,$00,$00]
    	EWrite 230,[$00,$00,$00,$00,$00]
    	EWrite 235,[$00,$00,$00,$00,$00]
    	EWrite 240,[$00,$00,$00,$00,$00]
    	EWrite 245,[$00,$00,$00,$00,$00]
    	
    
    
        '________________________________________________________________
        'Deklaracija promjenjivih
        '________________________________________________________________
       	Dim kolona As Byte
    	Dim brojac As Byte
    	Dim k As Byte
    	Dim scan  As Byte
    	Dim scroll As Byte
    	leddata var Byte[100]
        Dim ir_ulaz As Word ' WORD variabla za zaprimanje podataka
        Dim EEpromAdress As Byte 'eprom adresa za upis 
        Dim test As Word 'uporedjivach 
        Dim upisi As ir_ulaz.LowByte
        Dim i As Byte
        Dim sledeceslovo As Word
        Dim prethodnoslovo As Word
        Dim potvrdi As Word
        Dim play As Word
        Dim x As Byte
        Dim j As Byte
        Dim cnt As Byte
        Dim a As Byte
        Dim b As Byte
        Dim c As Byte
        Dim d As Byte
    
        '________________________________________________________________
        'poetene vrijednosti
        '________________________________________________________________
    
        EEpromAdress = 255
        cnt=0
        k=114
    
        '________________________________________________________________
        'Inicijalizacija
        '________________________________________________________________
        High PORTD.0
        DelayMS 1300
        Low PORTD.0
        DelayMS 1300
        '________________________________________________________________
        'pregledaj eeprom ako ima sta idi na main ako ne idi na pripremu
        '________________________________________________________________
          '*******************************************************************
        Declare RC5In_Pin PORTC.7                    'infrared sensor pin
        '********************************************************************
    
    provjera:
       
            test.LowByte = ERead 255 'iscitaj zapis iz eeproma sa adrese 255
                    If test.LowByte = $FF Then 'ako je FF 
                        GoSub eepromprogON 'idi u programiraj komande
                        DelayMS 500
                    EndIf    
            test.LowByte = ERead 120 ' iscitaj zapis iz eeproma sa adrese 120 (pocetak poruke)
                    If test.LowByte = $FF Then ' ako je 00 
                        GoSub odaberporuku     ' idi na odaberi poruku
                        DelayMS 500
                    EndIf 
                   
    main:
        
    Clear ' ocisti sve varijable
    Low PORTD.0  ' usli smo u mod za prikaz poruke
    a=14
    k=120
    j=0
    leddata[0-13] = $00             ' varijabla ledadta od 0 do 13 je 00
    For b = 0 To 11                 ' moguci broj slova u poruci
        For i = 0 To 4      
            c=i+a                   'povecaj a=14-19; a=20-24; a=26-30 itd...
            d=i+j+k                   'povecaj j=120-124; a=126-130; a=131-135 itd...
                leddata [c]= ERead d	'filuj ledadtu od 14 do max broja slova za prikaz iz eeproma pocevsi od 120 pa nadalje
                DelayUS 20  
        Next
        leddata [a+5]=ERead 119   'upisi prazanu kolonu izmedju slova	
          a=a+6   
          j=j+6   
     Next
           For scroll = 0 To c      ' skrolaj poruku c zadnji leddata
              
             For scan = 0 To 35
                      PORTC.1 = 1   'reseting 4017
                      PORTC.1 =0 
    			For kolona = 0 To 14  'broj kolona
    				PORTC.0 = 1       'clock 4017
                    PORTC.0 =0
                    PORTB = leddata[kolona]
    				DelayUS 250
                    PORTB=0    	
    		    Next
    
             Next
             For brojac = 0 To (c-1)
            leddata[brojac]=leddata[brojac+1]' pomjeri za jedan
            Next
    
            Next
                    If PORTD.1=1 Then 
                    GoSub odaberporuku 
        	 	End If
    GoTo main
    End
    
    eepromprogON: 'podprogram za odabir komadi za upravljanje             
        High PORTD.0  
        
                Repeat
                    ir_ulaz.LowByte= RC5In '  Primanje signala sa TSOP1738
                Until upisi<> 255' Trazi-cekaj dok ne naleti valjano zaglavlje signala
                       
          EWrite EEpromAdress , [ ir_ulaz.LowByte ]
          sledeceslovo.LowByte = ERead EEpromAdress ' pridruzi varijabli sledece slovo komandu i upisi u eprom na zadnju lokaciju
          For i = 0 To 4 
    	 leddata [i]=ERead i	'  prikazi strelicu
    	Next
             For scan = 0 To 185
             PORTC.1 = 1  'reseting 4017
             PORTC.1 =0	
    			For kolona = 0 To 4
    				PORTC.0 = 1 'clock 4017
                    PORTC.0 =0
                    PORTB = leddata[kolona]
    				DelayUS 500
                    PORTB=0     	
    		    Next
             Next
    Low PORTD.0
    DelayMS 100
    High PORTD.0
    DelayMS 100
    Low PORTD.0
    DelayMS 100
    High PORTD.0
                Repeat
                    ir_ulaz.LowByte= RC5In '  Primanje signala sa TSOP1738
                Until upisi<> 255' Trazi-cekaj dok ne naleti valjano zaglavlje signala
                EEpromAdress=EEpromAdress - 1      
          EWrite EEpromAdress , [ ir_ulaz.LowByte ]
          prethodnoslovo.LowByte = ERead EEpromAdress ' pridruzi varijabli sledece slovo komandu i upisi u eprom na zadnju lokaciju
          For i = 0 To 4 
    	 leddata [i]=ERead i+5	'  prikazi strelicu
    	Next
             For scan = 0 To 185
             PORTC.1 = 1  'reseting 4017
             PORTC.1 =0	
    			For kolona = 0 To 4
    				PORTC.0 = 1 'clock 4017
                    PORTC.0 =0
                    PORTB = leddata[kolona]
    				DelayUS 500
                    PORTB=0     	
    		    Next
             Next
    Low PORTD.0
    DelayMS 100
    High PORTD.0
    DelayMS 100
    Low PORTD.0
    DelayMS 100
    High PORTD.0
                Repeat
                    ir_ulaz.LowByte= RC5In '  Primanje signala sa TSOP1738
                Until upisi<> 255' Trazi-cekaj dok ne naleti valjano zaglavlje signala
                       EEpromAdress=EEpromAdress - 1
                       EWrite EEpromAdress , [ ir_ulaz.LowByte ]
          play.LowByte = ERead EEpromAdress  ' pridruzi varijabli play komandu i upisi u eprom na predzadnju lokaciju
          leddata[0]=$FE  'play simbol
    	leddata[1]=$7C
    	leddata[2]=$38
    	leddata[3]=$10
    	leddata[4]=$00
     
         For scan = 0 To 185
             PORTC.1 = 1  'reseting 4017
             PORTC.1 =0	
    			For kolona = 0 To 4
    				PORTC.0 = 1 'clock 4017
                    PORTC.0 =0
                    PORTB = leddata[kolona]
    				DelayUS 500
                    PORTB=0     	
    		    Next
             Next     
    Low PORTD.0
    DelayMS 100
    High PORTD.0
    DelayMS 100
    Low PORTD.0
    DelayMS 100
    High PORTD.0
    
     Repeat
                    ir_ulaz.LowByte= RC5In '  Primanje signala sa TSOP1738
                Until upisi<> 255' Trazi-cekaj dok ne naleti valjano zaglavlje signala
                       EEpromAdress=EEpromAdress -1
                       EWrite EEpromAdress , [ ir_ulaz.LowByte ] ' pridruzi varijabli potvrfi komandu i upisi u eprom na predpredzadnju  :D lokaciju
          potvrdi.LowByte = ERead EEpromAdress
            
          leddata[0]=$00  
    	leddata[1]=$00
    	leddata[2]=$08
    	leddata[3]=$10
    	leddata[4]=$20
    	leddata[5]=$10
    	leddata[6]=$08
    	leddata[7]=$04
    	leddata[8]=$02
    	leddata[9]=$01 
         For scan = 0 To 185
             PORTC.1 = 1  'reseting 4017
             PORTC.1 =0	
    			For kolona = 0 To 9
    				PORTC.0 = 1 'clock 4017
                    PORTC.0 =0
                    PORTB = leddata[kolona]
    				DelayUS 500
                    PORTB=0     	
    		    Next
             Next     
          For x=0 To 5
            Toggle PORTD.0
            DelayMS 100
          x=x+1
          Next 
          x=0
          EEpromAdress=0
    Return 'vrati se u if petlju na pocetku
    
    
    
    odaberporuku:	' podrpogram za odabir poruke za prikaz
    High PORTD.0
    sledeceslovo.LowByte = ERead 255
    prethodnoslovo.LowByte = ERead 254
    play.LowByte = ERead 253
    potvrdi.LowByte = ERead 252
    cnt=0
    k=114
    Low PORTD.1
    Repeat
           ir_ulaz.LowByte= RC5In '  Primanje signala sa TSOP1738
        Until upisi<> 255' Trazi-cekaj dok ne naleti valjano zaglavlje signala 
    While ir_ulaz.LowByte<>play.LowByte
        Repeat
           ir_ulaz.LowByte= RC5In '  Primanje signala sa TSOP1738
        Until upisi<> 255' Trazi-cekaj dok ne naleti valjano zaglavlje signala 
    If ir_ulaz.LowByte=prethodnoslovo.LowByte Then
              If cnt = 0 Then
                cnt=5
             EndIf
       cnt=cnt-5
        For i = 0 To 4 
    	 leddata [i]=ERead i+cnt	'  
    	Next
             For scan = 0 To 185
             PORTC.1 = 1  'reseting 4017
             PORTC.1 =0	
    			For kolona = 0 To 4
    				PORTC.0 = 1 'clock 4017
                    PORTC.0 =0
                    PORTB = leddata[kolona]
    				DelayUS 500
                    PORTB=0     	
    		    Next
             Next
            
    ElseIf ir_ulaz.LowByte=sledeceslovo.LowByte Then
    
       cnt=cnt+5
    
        For i = 0 To 4 
    	 leddata [i]=ERead i+cnt	'  
    	Next
             For scan = 0 To 185
             PORTC.1 = 1  'reseting 4017
             PORTC.1 =0	
    			For kolona = 0 To 4
    				PORTC.0 = 1 'clock 4017
                    PORTC.0 =0
                    PORTB = leddata[kolona]
    				DelayUS 500
                    PORTB=0     	
    		    Next
             Next
                       If cnt = 119 Then
                cnt=0
             EndIf
    ElseIf ir_ulaz.LowByte=potvrdi.LowByte Then 'upisi odabran0o slovo u narednu slobodnu eeprom lokaciju
     k=k+6'krecemo od 120
     For i = 0 To 4 
    	 leddata [i]=ERead i+cnt
         DelayUS 10	'  
    	Next
     
     For i = 0 To 4 
     
    	 EWrite (i+k),[leddata [i]]	' 
         DelayMS 20 
     Next
    
    For scroll =0 To 1
     For i = 0 To 4 
    	 leddata [i]=ERead i+cnt	'prikazi odabrano slovo  
    	Next
    	leddata[5]=$00
    	leddata[6]=$00
    	leddata[7]=$08
    	leddata[8]=$10
    	leddata[9]=$20
    	leddata[10]=$10
    	leddata[11]=$08
    	leddata[12]=$04
    	leddata[13]=$02
    	leddata[14]=$01
             For scan = 0 To 185
             PORTC.1 = 1  'reseting 4017
             PORTC.1 =0	
    			For kolona = 0 To 14
    				PORTC.0 = 1 'clock 4017
                    PORTC.0 =0
                    PORTB = leddata[kolona]
    				DelayUS 500
                    PORTB=0     	
    		    Next
             Next
    Next
    EndIf
     
    Wend
    Low PORTD.0
    Return ' vrati se odakle si i dosao

  3. #43
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    Default Re: 8x8 Scrolling LED display (Simple example)

    Hi to all,

    A newbie here. I try to compile the file from first post but I receive a constant error
    ERROR Line 51: LOOP without a matching DO.
    How can I avoid that?

    Many thanks in advance
    Gabi

    P.S.
    I know it is a old thread but maybe someone or OP will chime in and help me with that error

  4. #44
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    Default Re: 8x8 Scrolling LED display (Simple example)

    I suppose you are using PBP 2.60, right?

    LOOP is a reserved word for 2.60. So use Loop1 or something.

    Ioannis

  5. #45
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    Default Re: 8x8 Scrolling LED display (Simple example)

    Quote Originally Posted by Ioannis View Post
    I suppose you are using PBP 2.60, right?

    LOOP is a reserved word for 2.60. So use Loop1 or something.

    Ioannis
    Hi Ioannis,

    Yes, sorry I forgot to tell that. Yessss it is working, meaning compile without errors. Now my problem it is in Proteus - Simulation it is not running on real time due the excessive CPU load?? Why?
    Do I need to put some delays in the code?

    Thank you in advance
    Gabi

  6. #46
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    Default Re: 8x8 Scrolling LED display (Simple example)

    Sorry, I do not use Proteus.

    I prefer the real stuff

    Ioannis

  7. #47
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    Default Re: 8x8 Scrolling LED display (Simple example)

    Still, Ioannis can you have a look on that code and give me your expert opinion

    Rgds
    Gabi

  8. #48
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    Default Re: 8x8 Scrolling LED display (Simple example)

    The code is simple and should run with no problems.

    If you insist on simulation, I do not know much. I hear that Proteus is the Best, but still have a few flaws.

    Did you try the code on real circuit?

    Ioannis

  9. #49
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    Default Re: 8x8 Scrolling LED display (Simple example)

    Hi Ioannis,

    No, I do not have all the parts to try it. That was the reason for using Proteus. I saw a post from you regarding ULN 2083. If I decided to use that instead ULN 2004 what else should I need to modify (software and hardware)?

    Regards
    Gabi

  10. #50
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    Default Re: 8x8 Scrolling LED display (Simple example)

    Quote Originally Posted by gabi68 View Post
    regarding ULN 2083. If I decided to use that instead ULN 2004 what else should I need to modify (software and hardware)?

    Regards
    Gabi
    ULN2803 is an 8 channel transistor array (18pin package), and the ULN2004 is a 7 channel transistor array (16pin package)

    The software remains the same, with the hardware you can lower the component count, by replacing 2 ULN2004 with 1 ULN2803
    Attached Images Attached Images   

  11. #51
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    Default Re: 8x8 Scrolling LED display (Simple example)

    Hi,

    After 1 month I finally make that running - simulating properly in Proteus. My problem was that ULN2803. I didn't know that chip invert signal's. After I put some hex inverters 7404 everything running properly.
    My question is:
    in real life (I will build the real circuit) I need that inverters or everything will run normal without that?

    Many thanks
    Gabi

  12. #52
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    Default Re: 8x8 Scrolling LED display (Simple example)

    Instead of inverters, why don't you invert he data that you output from the PIC?

    Ioannis

  13. #53
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    Default Re: 8x8 Scrolling LED display (Simple example)

    Instead of inverters, why don't you invert the data that you output from the PIC?

    Ioannis

  14. #54
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    Default Re: 8x8 Scrolling LED display (Simple example)

    Hi Ioannis,

    I try to do that but, I failed. Can you show my how? On the other hand the question it is still: do I need that inverters in a real circuit?

    Thank you for your time
    Gabi
    Last edited by gabi68; - 17th March 2011 at 10:49. Reason: typo

  15. #55
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    Default Re: 8x8 Scrolling LED display (Simple example)

    If your load needs an 1 and you send a 0 then it is obvious that you need an inverter.

    But as I said, instead of 1, send 0 in software.

    For example,

    var_a=%10101010

    var_1=var_a XOR %11111111

    The result in var_a will be the complement of the initial value.

    Ioannis

  16. #56
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    Default Re: 8x8 Scrolling LED display (Simple example)

    Hi all,
    This update now scrolls temperature in degrees C & F,
    with indication arrow to show increase or decrease in temperature
    and scrolls 'wellyb00t' at every few minutes.
    Works with PBP 2.60C & MPLABS v8.63
    Attached Files Attached Files
    Last edited by wellyboot; - 29th September 2011 at 14:45.

  17. #57
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    Default Re: 8x8 Scrolling LED display (Simple example)

    See above post, this is the HEX file for it.

    couldnt add a file with .hex extention so changed it to .txt
    just remove .txt extention
    Attached Files Attached Files

  18. #58
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    Smile Re: 8x8 Scrolling LED display (Simple example)

    hello all..

    i need your help. i want to build program even one word to display on dot matrix (7x5) with pic16f877a. i use c language. but when i compile it don't have any error. but it can't work on dot matrix after i load that program. anyone can help me.. i'm on stuck. hope you all can help me. here my program. i want use port a n port b.

    #include <16f877a.h>


    #use delay(clock=20000000)
    #fuses hs,nowdt,nocpd,nolvp,noprotect

    #byte porta=0x06
    #byte portb=0x08
    #bit clock=portd.6
    #bit data=portd.7

    unsigned int8 i,j,index1,n,
    addr[11]={0xEA,0xEA,0x2A,0x2A,0x2A,0x2A,0xAA,0x82,0xFF,0xF F,0xFF},
    cont[11];

    void main()
    {
    set_tris_a(0x00);
    set_tris_b(0x00);
    while(1)
    {
    for(n=0;n<=99;n++)
    {
    data=1;
    for(i=0;i<=5;i++)
    {
    clock=1;
    portb=addr[i];
    delay_ms(1);
    clock=0;
    data=0;
    }
    }

    for(j=0;j<=7;j++)
    {
    cont[j]=addr[j];
    }

    for(j=0;j<=7;j++)
    {
    addr[j]=cont[j+1];
    }
    addr[10]=cont[0];

    }
    }


    besides that i'm a new in programming. hope n hope anyone can help me.. thank you.

  19. #59
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    Default Re: 8x8 Scrolling LED display (Simple example)

    Hi, Please let me know how to program this IC PIC16F872 as I am new to this area.
    My email: [email protected]
    Appreciate your help

  20. #60
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    Default Re: 8x8 Scrolling LED display (Simple example)

    Quote Originally Posted by prasanna View Post
    Hi, Please let me know how to program this IC PIC16F872 as I am new to this area.
    My email: [email protected]
    Appreciate your help
    u got lot to learn dear.u need a programmer n programming software to do this..
    [r u from srilanka o uk?]

  21. #61
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    Post Re: 8x8 Scrolling LED display (Simple example) sir please send me code usins ATMEGA16

    sir plz send me the code and ckt diagram of LED moving display using ATmega 16

  22. #62
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    Default Re: 8x8 Scrolling LED display (Simple example) sir please send me code usins ATMEGA16

    This is a PIC controller forum. Not AVR.

    Ioannis

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    Default Re: 8x8 Scrolling LED display (Simple example)

    Hi please any one would you able to help me to build the LED Matrix project? i have already designed it for 10x7 matrix. it's working nicely. but if i extend this to 20x7 then it s running and blinking fastly. i think the delay wil b a problem. now i want some guidelines from u. please it's urgent. help me.[email protected]. mail me the code in c

  24. #64
    Join Date
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    Default Re: 8x8 Scrolling LED display (Simple example)

    Sure, which compiler do you want me to make it?

    Please, check the forum and what we do here. No C and sure no serving to the plate.

    Ioannis
    Last edited by Ioannis; - 9th July 2012 at 07:54.

  25. #65


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    Default Re: 8x8 Scrolling LED display (Simple example)

    Thank you very much for ur quick reply,
    Now i'm using MBlap HItech Compiler and Micro c for pic.

    Please guide me. i already done this without shift register but when i try using shift register it's flickering please help me. it's urgent

  26. #66
    Kalaiyarasi's Avatar
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    Default 8 x 8 led

    hai, i am doing project on PIC16F877A.I am executing the code in MPLAB.Can anyone help me to display the characters from A to Z in 8 X 8 LED using MPLAB code....

  27. #67
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    Default Re: 8x8 Scrolling LED display (Simple example)


  28. #68
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    Default Re: 8x8 Scrolling LED display (Simple example)

    hello mr.fratello... can you help me? im very need your help.. i want to do font moving display... but the coding is complicated to me... can u teach me about the coding for font moving display...

  29. #69
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    Default Re: 8x8 Scrolling LED display (Simple example)

    im use pic 16f877a... please help me... anybody also can help me...

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