LED MESSAGE DISPLAY

[ernest]

Hello, I'm trying to build a 5x7 dot-matrix display using PIC16F877A. So far, I've been able to display scrolling characters on the dot matrix. But it would be much better if user can change the message to be displayed by simply using the RS232.

I've written a program below but it failed to display the message. Please comment on any mistakes done in the program. Is there a better way of writing the program? All advice are much appreciated.


#if defined(__PCM__)
#include <16F877A.H>
#fuses HS,NOWDT,NOPUT,NOPROTECT,NOBROWNOUT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_A4, rcv=PIN_A5) //use portA instead

#IFNDEF EXP_OUT_ENABLE
#define EXP_OUT_ENABLE PIN_C2
#define EXP_OUT_CLOCK PIN_C1
#define EXP_OUT_DO PIN_C0
#define NUMBER_OF_74595 3 //trying out with 3 ICs
#ENDIF
#include <74595_V02.C>

#byte port_a=5
#byte port_b=6
#byte port_c=7
#byte port_d=8


// TO DISPLAY 5X7 DOT MATRIX CHARACTER
//char const msg[80]={0,0, 127,8,8,8,127, 0,56,84,84,84,24, 0,65,127,64, 0,65,127,64, 0,56,68,68,68,56, 0,88,56,0, 127,8,4,4,120, 0,56,68,68,68,56, 0,60,64,48,64,60, 0,0,32,84,84,84,56, 0,124,8,4,4,8, 0,56,84,84,84,24, 0,0,60,64,64,32,124, 0,2,1,81,9,6};
// ==> ABLE TO DISPLAY: "Hello,how are u?"
// the '0' was placed in front of every char. to give spacing of 1column

char msg[40];
char s1[16];
void get_line1() { // to acquire 16 char.
s1[0]=getc();
printf("\ts1==> %C",s1[0]);
s1[1]=getc();
printf("%C",s1[1]);
s1[2]=getc();
printf("%C",s1[2]);
s1[3]=getc();
printf("%C",s1[3]);
s1[4]=getc();
printf("%C",s1[4]);
s1[5]=getc();
printf("%C",s1[5]);
s1[6]=getc();
printf("%C",s1[6]);
s1[7]=getc();
printf("%C",s1[7]);
s1[8]=getc();
printf("%C",s1[8]);
s1[9]=getc();
printf("%C",s1[9]);
s1[10]=getc();
printf("%C",s1[10]);
s1[11]=getc();
printf("%C",s1[11]);
s1[12]=getc();
printf("%C",s1[12]);
s1[13]=getc();
printf("%C",s1[13]);
s1[14]=getc();
printf("%C",s1[14]);
s1[15]=getc();
printf("%C",s1[15]);
}

char const ascii_char3[6][3] = {
{ 0,11,7 } // ' [0]
{ 0,88,56 } // , [1]
{ 0,96,96 } // . [2]
{ 0,54,54 } // : [3]
{ 0,91,59 } // ; [4]
{ 0,7,11 } // ` [5]
};

char const ascii_char4[11][4] = {
{ 0, 7, 0, 7 } // " [0]
{ 0,28,34,65 } // ( [1]
{ 0,65,34,28 } // ) [2]
{ 0,66,127,64 } // 1 [3]
{ 0,65.127,65 } // I (Capital i)
{ 0,127,65,65 } // [ [5]
{ 0,65,65,127 } // ] [6]
{ 0,68,125,64 } // i [7]
{ 0,65,127,64 } // l (Small L)
{ 0,8,54,65 } // { [9]
{ 0,65,54,8 } // } [10]
};

char const ascii_char5[8][5] = {
{ 0, 8,62, 8, 8 } // + [0]
{ 0,8,20,34,65 } // < [1]
{ 0,65,34,20,8 } // > [2]
{ 0,56,68,68,68 } // c [3]
{ 0,32,64,68,61 } // j [4]
{ 0,127,16,40,68} // k [5]
{ 0, 4,63,68,68 } // t [6]
{ 0, 2, 1, 2,42 } // ~ [7]
};

char const ascii_char6[30][6] = {
{ 0, 20,127,20,127,20 } // DEC 35 '#' [0]
{ 0, 36, 42, 127, 42, 18 } // 36D '$' [1]
{ 0, 39, 21, 107, 84, 114 } // 37D '%' [2]
{ 0, 54, 73, 86, 32, 80 } // 38D '&' [3]
{} //0, 11, 7 // 39H [4]
{} //0, 28, 34, 65 // 40D [5]
{} //0, 65, 34, 28 // 41D [6]
{ 0, 42, 28, 127, 28, 42 } // 42D '*' [7]
{} //0, 8, 62, 8, 8 // 43D [8]
{} //0, 88, 56 // 44D [9]
{ 0, 8,8,8,8,8 } // 45D '-' [10]
{} //0, 96, 96 // 46D [11]
{ 0, 32, 16, 8, 4, 2 } // 47D '/' [12]
{ 0, 62, 81, 73, 69, 62 } // 48D '0' [13]
{} //0,66, 127, 64 // 49D [14]
{ 0, 114, 73, 73, 73, 70 } // 50D '2' [15]
{ 0, 34, 65, 73, 73, 54 } // 51D '3' [16]
{ 0, 24, 20, 18, 127, 16 } // 52D '4' [17]
{ 0, 39, 69, 69, 69, 57 } // 53D '5' [18]
{ 0, 120, 74, 73, 73, 48 } // 54D '6' [19]
{ 0, 1, 113, 9, 5, 3 } // 55D '7' [20]
{ 0, 54, 73, 73, 73, 54 } // 56D '8' [21]
{ 0, 6, 73, 73, 41, 30 } // 57D '9' [22]
{} //0, 54, 54 // 58D [23]
{} //0, 91, 59 // 59D [24]
{} //0, 8, 20, 34, 65 // 60D [25]
{ 0, 20, 20, 20, 20, 20 } // 61D [26]
{} //0, 65, 34, 20, 8 // 62D [27]
{ 0, 2, 1, 81, 9, 6 } // 63D [28]
{ 0, 50, 73, 121, 65, 62 } // 64D [29]
};

char const ascii_char7[31][6] = {
{ 0, 124, 18, 17, 18, 124 } // 65
{ 0, 65, 127, 73, 73, 54 } // 66
{ 0, 62, 65, 65, 65, 34 } // 67
{ 0, 65, 127, 65, 65, 62 } // 68
{ 0, 127, 73, 73, 65, 65 } // 69
{ 0, 127, 9, 9, 1, 1 } // 70
{ 0, 62, 65, 73, 73, 58 } // 71
{ 0, 127, 8, 8, 8, 127 } // 72
{ } // 0, 65, 127, 65 // 73 X
{ 0, 32, 64, 65, 63, 1 } // 74
{ 0, 127, 8, 20, 34, 65 } // 75
{ 0, 127, 64, 64, 64, 64 } // 76
{ 0, 127, 2, 12, 2, 127 } // 77
{ 0, 127, 2, 4, 8, 127 } // 78
{ 0, 62, 65, 65, 65, 62 } // 79
{ 0, 127, 9, 9, 9, 6 } // 80
{ 0, 62, 9, 81, 33, 94 } // 81
{ 0, 127, 9, 25, 41, 70 } // 82
{ 0, 38, 73, 73, 73, 50 } // 83
{ 0, 1,1,127, 1, 1 } // 84
{ 0, 63, 64, 64, 64, 63 } // 85
{ 0, 7, 24, 96, 24, 7 } // 86
{ 0, 127, 32, 24, 32, 127 } // 87
{ 0, 99, 20, 8, 20, 99 } // 88
{ 0, 3, 4, 120, 4, 3 } // 89
{ 0 97, 81, 73, 69, 67 } // 90
{ } // 0, 127, 65, 65 // 91 X
{ 0, 2, 4, 8, 16, 32 } // 92
{ } //0, 65, 65, 127 // 93 X
{ 0, 4, 2, 1, 2, 4 } // 94
{ 0, 64, 64, 64, 64, 64 } // 95
};

char const ascii_char8[26][6] = {
{ 0, 32, 84, 84, 84, 56 } // 97
{ 0, 127, 40, 68, 68, 556 } // 98
{ } // 0, 56, 68, 68, 68 // 99 X
{ 0, 56, 68, 68, 40, 127 } // 100
{ 0, 56, 84, 84, 84, 24 } // 101
{ 0, 8, 63, 9, 9, 2 } // 102
{ 0, 8, 84, 84, 84, 60 } // 103
{ 0, 127, 8, 4, 4, 120 } // 104
{ } // 0, 68, 125, 64 // 105 X
{ } // 0, 32, 64, 68, 61 // 106 X
{ } // 0, 127, 16, 40, 68 // 107 X
{ } //0, 65, 127, 64 // 108 X
{ 0, 124, 4, 120, 4, 120 } // 109
{ 0, 124, 8, 4, 4, 120 } // 110
{ 0, 56, 68, 68, 68, 56 } // 111
{ 0, 124, 20, 20, 20, 8 } // 112
{ 0, 8, 20, 20, 20, 124 } // 113
{ 0, 124, 8, 4, 4, 8 } // 114
{ 0, 72, 84, 84, 84, 36 } // 115
{ } //0, 4, 63, 68, 68 // 116 X
{ 0, 60, 64, 64, 32, 124 } // 117
{ 0, 28, 32, 64, 32, 28 } // 118
{ 0, 60, 64, 48, 64, 60 } // 119
{ 0, 68, 40, 16, 40, 68 } // 120
{ 0, 12,80, 80, 80, 60 } // 121
{ 0, 36, 100, 84, 76, 36 } // 122
};


main()
{
int n = 0;
int mask[4];
int data[4];
int delaycount;
int startposition;
int index;
int i = 0; int x = 0; int y = 0; // x=counter for row, y=counter for column ie. [x][y]
int z = 0; // to count size of msg[]
mask[0] = 0x01; mask[1] = 0x00; mask[2] = 0x00; mask[3] = 0x00;

set_tris_b(0); //set portb to outputs
set_tris_c(0); //set portc to outputs
set_tris_d(0);
port_b = 0;
port_c = 0; //zero port c
startposition = 0;

msg[0] = ascii_char6[1][0]; // $
msg[1] = ascii_char6[1][1];
msg[2] = ascii_char6[1][2];
msg[3] = ascii_char6[1][3];
msg[4] = ascii_char6[1][4];
msg[5] = ascii_char6[1][5];

msg[6] = ascii_char6[22][0]; // 9
msg[7] = ascii_char6[22][1];
msg[8] = ascii_char6[22][2];
msg[9] = ascii_char6[22][3];
msg[10] = ascii_char6[22][4];
msg[11] = ascii_char6[22][5];

msg[12] = ascii_char5[7][0]; // ~
msg[13] = ascii_char5[7][1];
msg[14] = ascii_char5[7][2];
msg[15] = ascii_char5[7][3];
msg[16] = ascii_char5[7][4];

msg[17] = ascii_char3[2][0]; // .
msg[18] = ascii_char3[2][1];
msg[19] = ascii_char3[2][2];

msg[20] = ascii_char4[7][0]; // i
msg[21] = ascii_char4[7][1];
msg[22] = ascii_char4[7][2];
msg[23] = ascii_char4[7][3];

z = sizeof(msg);


do
{

if(!input(PIN_E1)) // if RE1 == LOW (pressed)
{
printf("\r\nEnter the char.: ");
get_line1(); // acquire 16 char.
n = 0; z=0;

for(n=0; n<8 ; n++) // allow display of 8 char.
{

if(s1[n]==32) // ' BLANK ' ==> 1 column
{ msg[n]=0; z+=1;}


if(s1[n]==33) // ' ! ' ==> 2 columns incl.LEADING SPACE
{ msg[n]=0;
msg[n+1]=95;
z+=2; }

// ==> 5 columns incl. LEADING SPACE
if((s1[n]==43)&&(s1[n]==60)&&(s1[n]==62)&&(s1[n]==99)&&(s1[n]==106)&&(s1[n]==107)&&(s1[n]==116)&&(s1[n]==126))
{
if(s1[n]==43)
x = 0;
if(s1[n]==60)
x = 1;
if(s1[n]==62)
x = 2;
if(s1[n]==99)
x = 3;
if(s1[n]==106)
x = 4;
if(s1[n]==107)
x = 5;
if(s1[n]==116)
x = 6;
if(s1[n]==126)
x = 7;

for(y=0;y<5;y++)
{
msg[z+y] = ascii_char5[x][y];
}
z+=5;
} // end of IF s1 compare for 5columns


// ==> 4 columns incl. LEADING SPACE
if((s1[0]==34) && (s1[0]==40) && (s1[0]==41) && (s1[0]==49) && (s1[0]==73) && (s1[0]==91) && (s1[0]==93)
&& (s1[0]==105) && (s1[0]==108) && (s1[0]==123) && (s1[0]==125))
{
switch(s1[n])
{
case 34: x=0; break;
case 40: x=1; break;
case 41: x=2; break;
case 49: x=3; break;
case 73: x=4; break;
case 91: x=5; break;
case 93: x=6; break;
case 105: x=7; break;
case 108: x=8; break;
case 123: x=9; break;
case 125: x=10; break;
}

for(y=0;y<4;y++)
{
msg[z+y] = ascii_char4[x][y];
}
z+=4;
} // end of IF s1 compare for 4columns


// ==> 3 columns incl. LEADING SPACE
if((s1[n]==39) && (s1[n]==44) && (s1[n]==46) && (s1[n]==58) && (s1[n]==59) && (s1[n]==96))
{
switch(s1[n])
{
case 39: x=0; break;
case 44: x=1; break;
case 46: x=2; break;
case 58: x=3; break;
case 59: x=4; break;
case 96: x=5; break;
}

for(y=0;y<3;y++)
{
msg[z+y] = ascii_char3[x][y];
}
z+=3;
} // end of IF s1 compare for 3columns

} //END OF for-loop for n-flag

} // END of INPUT(PIN_E1)




delaycount=5;
while (delaycount)
{
index = startposition;


for (i=0;i<32;i++) // we have 32 columns to drive //for (i=0;i<32;i++) //
{
// store our mask in an array. we need to do this because
// the call to write_expanded_outputs will destroy the value
// passed in.
data[0] = mask[0]; // store which column we are driving
data[1] = mask[1]; // in an array
data[2] = mask[2];
data[3] = mask[3];

if(!input(PIN_E2)) // to allow user to FREEZE DISPLAY/SCROLLING when RE2==LOW
delaycount = 4;

index = i + startposition; // point to the next pattern to display
if (index >= z) //sizeof(msg)) // make sure that we don't exceed the array
index -= z; //sizeof(msg);

// port_b = 0; // disable driving the LEDs
//port_d = 0; // use port d to drive ROWS
port_d=0;
write_expanded_outputs(data); // enable our column driver



// port_b = msg[index]; // drive our LEDs
port_d = msg[index];

if (shift_left(mask,4,0))
mask[0] = 0x01;
delay_us(750); // adjust this value to control the drive time
//for the leds
}

--delaycount; // decrement our delay loop counter
}

++startposition; // Point to the next data pattern

if (startposition >= sizeof(msg)) // make sure that we don't exceed the array
startposition = 0;

// if(!input(PIN_E1)) // to allow user to FORCE the display to RETURN to ORIGIN when RE1==LOW
// {
// startposition = 2; // reset starting position with OFFSET of 2 (otherwise 2 trash column will be shown)
// index = 0; // reset index
// i = 0; // reset i count
// }

} while(1); // END while(1)
} // END main()

THANK YOU.

[NeoMatrix]

Hello Mark

its me again sorry to disturb u

i just build 1 of 5x7 dot matrix message its displaying the character 1 by 1 i want to expand this to 5 of 5x7

i use pic16f628 and 1 74hc595 for 7 rows i connected to PORTA with 220 ohm resistor for cols i connected to 595 from porta for 595 pin 11,12 connected together and from pin 11 1k resistor to gnd pin 11 connected to porta.1 and pin 12 connected to porta.2 and pin 14 connected to porta.0 and pin 13,14 with 1 resistor to gnd this is my circuit and this is my programm its not displaying continously after displaying all the characters and i want to expand this to 5 of 5x7 can u suggest me

[Matrix4U]

All Are dumb and waste no 1 will give the right solution then whats the use of studying eelectronics and embed for years

[ELCouz]

[kevcon]

Judging from his previous pots, it looks like he's trying to leach some code for what is most likely a school project.

Now, if he was to post his circuit and code that he has written I sure there are any number of people on here, including myself, that would be willing to help him.

He needs to make some effort though, instead of just saying "can you post code."

[Matrix4U]

yes today i will post my circuit and source code and proteus file i just need little help

thanks