DIY Moving Message Display

sohail_akram said:

In serial terminal Press ESC then type your 40 char message and Press Enter

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auri_z said:

I try to build board message from this site
**broken link removed**

my board message 7x24, i succesful build it and it working

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sohail_akram said:

This is complete 5x7 19 matrix Moving message display with RS232 Control.
atmel 89c51 is used.column are scan by 74ls164
source code are in c keil c51
Proteus simulation file is included.

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rojo said:

Code:

#include <90s8535.h>
#include <delay.h>                  
                              

// led display
#define LED_RESET		PORTB.0
#define LED_CLOCK		PORTB.1
#define LED_DATA		PORTB.4	
#define SCROLL_DELAY	140  // multiple of 7 (use smaller numbers for faster scroll)

// keyboard 
#define KBD_CLOCK		PORTD.2  // to be used for host -> keyboard communication
#define KBD_DATA        	PIND.4                                 
#define BUFF_SIZE		64
            
// lcd 
#define LCD_RS			PORTD.5
#define LCD_RW 		PORTD.6
#define LCD_E  		PORTD.7 	 
#define COMMAND_MODE 	0
#define DATA_MODE    	1	     
#define WRITE_MODE   	0
#define READ_MODE    	1 		                                                              
#define LCD_DATA_PORT	PORTC     
                  
// functions                  
void lcd_init(void);
void lcd_clear(void);
void lcd_putc(unsigned char);
void lcd_putsf(unsigned char flash *); 
void lcd_puts(unsigned char *str);
interrupt [EXT_INT0] keyboard_isr(void); 
void put_char_kbbuff(unsigned char);   
void put_scancode_kbbuff(unsigned char);
int getchar(void);                  
int kbhit(void);
void decode(unsigned char);

// global variables ***************************    
unsigned char kb_buffer[BUFF_SIZE];
unsigned char bitcount;	    
unsigned char *inpt, *outpt;
unsigned char buffcnt = 0;                                                                                                                    

// led character definitions 
// 5 data columns + 1 space
// for each character
flash unsigned char led_chars[94][6] = {  
0x00,0x00,0x00,0x00,0x00,0x00,	// space
0x00,0x00,0xfa,0x00,0x00,0x00,	// !	
0x00,0xe0,0x00,0xe0,0x00,0x00,	// "
0x28,0xfe,0x28,0xfe,0x28,0x00,	// #
0x24,0x54,0xfe,0x54,0x48,0x00,  // $
0xc4,0xc8,0x10,0x26,0x46,0x00,  // %
0x6c,0x92,0xaa,0x44,0x0a,0x00,  // &
0x00,0xa0,0xc0,0x00,0x00,0x00,  // '
0x00,0x38,0x44,0x82,0x00,0x00,	// (
0x00,0x82,0x44,0x38,0x00,0x00,  // )
0x28,0x10,0x7c,0x10,0x28,0x00,  // *
0x10,0x10,0x7c,0x10,0x10,0x00,  // +
0x00,0x0a,0x0c,0x00,0x00,0x00,  // ,
0x10,0x10,0x10,0x10,0x10,0x00,  // -
0x00,0x06,0x06,0x00,0x00,0x00,  // .
0x04,0x08,0x10,0x20,0x40,0x00,  // /  
0x7c,0x8a,0x92,0xa2,0x7c,0x00,  // 0
0x00,0x42,0xfe,0x02,0x00,0x00,  // 1
0x42,0x86,0x8a,0x92,0x62,0x00,  // 2
0x84,0x82,0xa2,0xd2,0x8c,0x00,	// 3
0x18,0x28,0x48,0xfe,0x08,0x00,	// 4
0xe5,0xa2,0xa2,0xa2,0x9c,0x00,	// 5
0x3c,0x52,0x92,0x92,0x0c,0x00,	// 6
0x80,0x8e,0x90,0xa0,0xc0,0x00,	// 7
0x6c,0x92,0x92,0x92,0x6c,0x00,	// 8
0x60,0x92,0x92,0x94,0x78,0x00,	// 9  
0x00,0x6c,0x6c,0x00,0x00,0x00,	// :
0x00,0x6a,0x6c,0x00,0x00,0x00,	// ;
0x10,0x28,0x44,0x82,0x00,0x00,	// <
0x28,0x28,0x28,0x28,0x28,0x00,	// =
0x00,0x82,0x44,0x28,0x10,0x00,	// >
0x40,0x80,0x8a,0x90,0x60,0x00,	// ?
0x4c,0x92,0x9e,0x82,0x7c,0x00,	// @
0x7e,0x88,0x88,0x88,0x7e,0x00,	// A
0xfe,0x92,0x92,0x92,0x6c,0x00,	// B
0x7c,0x82,0x82,0x82,0x44,0x00,	// C
0xfe,0x82,0x82,0x44,0x38,0x00,	// D
0xfe,0x92,0x92,0x92,0x82,0x00,	// E
0xfe,0x90,0x90,0x90,0x80,0x00,	// F
0x7c,0x82,0x92,0x92,0x5e,0x00,	// G
0xfe,0x10,0x10,0x10,0xfe,0x00,	// H
0x00,0x82,0xfe,0x82,0x00,0x00,	// I
0x04,0x02,0x82,0xfc,0x80,0x00,	// J
0xfe,0x10,0x28,0x44,0x82,0x00,	// K
0xfe,0x02,0x02,0x02,0x02,0x00,	// L
0xfe,0x40,0x30,0x40,0xfe,0x00,	// M
0xfe,0x20,0x10,0x08,0xfe,0x00,	// N
0x7c,0x82,0x82,0x82,0x7c,0x00,	// O
0xfe,0x90,0x90,0x90,0x60,0x00,	// P
0x7c,0x82,0x8a,0x84,0x7a,0x00,	// Q
0xfe,0x90,0x98,0x94,0x62,0x00,	// R
0x62,0x92,0x92,0x92,0x8c,0x00,	// S
0x80,0x80,0xfe,0x80,0x80,0x00,	// T
0xfc,0x02,0x02,0x02,0xfc,0x00,	// U
0xf8,0x04,0x02,0x04,0xf8,0x00,	// V
0xfc,0x02,0x1c,0x02,0xfc,0x00,	// W
0xc6,0x28,0x10,0x28,0xc6,0x00,	// X
0xe0,0x10,0x0e,0x10,0xe0,0x00,	// Y
0x86,0x8b,0x92,0xa2,0xc2,0x00,	// Z
0x00,0xfe,0x82,0x82,0x00,0x00,	// [
0x00,0x00,0x00,0x00,0x00,0x00,     // *** do not remove this empty char ***
0x00,0x82,0x82,0xfe,0x00,0x00,	// ]
0x20,0x40,0x80,0x40,0x20,0x00,	// ^
0x02,0x02,0x02,0x02,0x02,0x00,	// _
0x00,0x80,0x40,0x20,0x00,0x00,	// `
0x04,0x2a,0x2a,0x2a,0x1e,0x00,	// a
0xfe,0x12,0x22,0x22,0x1c,0x00,	// b
0x1c,0x22,0x22,0x22,0x04,0x00,	// c
0x1c,0x22,0x22,0x12,0xfe,0x00,	// d
0x1c,0x2a,0x2a,0x2a,0x18,0x00,	// e
0x10,0x7e,0x90,0x80,0x40,0x00,	// f
0x30,0x4a,0x4a,0x4a,0x7c,0x00,	// g
0xfe,0x10,0x20,0x20,0x1e,0x00,	// h
0x00,0x22,0xbe,0x02,0x00,0x00,	// i
0x04,0x02,0x22,0xbc,0x00,0x00,	// j
0xfe,0x08,0x14,0x22,0x00,0x00,	// k
0x00,0x82,0xfe,0x02,0x00,0x00,	// l
0x3e,0x20,0x18,0x20,0x1e,0x00,	// m
0x3e,0x10,0x20,0x20,0x1e,0x00,	// n
0x1c,0x22,0x22,0x22,0x1c,0x00,	// o
0x3e,0x28,0x28,0x28,0x10,0x00,	// p
0x10,0x28,0x28,0x18,0x3e,0x00,	// q
0x3e,0x10,0x20,0x20,0x10,0x00,	// r
0x12,0x2a,0x2a,0x2a,0x04,0x00,	// s
0x20,0xfc,0x22,0x02,0x04,0x00,	// t
0x3c,0x02,0x02,0x04,0x3e,0x00,	// u
0x38,0x04,0x02,0x04,0x38,0x00,	// v
0x3c,0x02,0x0c,0x02,0x3c,0x00,	// w
0x22,0x14,0x08,0x14,0x22,0x00,	// x
0x30,0x0a,0x0a,0x0a,0x3c,0x00,	// y
0x22,0x26,0x2a,0x32,0x22,0x00, 	// z
0x00,0x10,0x6c,0x82,0x00,0x00,	// { 
0x00,0x00,0xfe,0x00,0x00,0x00,	// |
0x00,0x82,0x6c,0x10,0x00,0x00 };	// }


// keyboard scan codes (without & with shift key pressed)
flash unsigned char unshifted[67][2] = {
//0x0d,9,
0x0e,'`',0x15,'q',0x16,'1',0x1a,'z',0x1b,'s',0x1c,'a',0x1d,'w',0x1e,'2',0x21,'c',0x22,'x',0x23,'d',0x24,'e',
0x25,'4',0x26,'3',0x29,' ',0x2a,'v',0x2b,'f',0x2c,'t',0x2d,'r',0x2e,'5',0x31,'n',0x32,'b',0x33,'h',0x34,'g',
0x35,'y',0x36,'6',0x39,',',0x3a,'m',0x3b,'j',0x3c,'u',0x3d,'7',0x3e,'8',0x41,',',0x42,'k',0x43,'i',0x44,'o',
0x45,'0',0x46,'9',0x49,'.',0x4a,'/',0x4b,'l',0x4c,';',0x4d,'p',0x4e,'-',0x52,'`',0x54,'[',0x55,'=',0x5a,13,
0x5b,']',0x5d,'/',0x61,'<',0x66,8,  0x69,'1',0x6b,'4',0x6c,'7',0x70,'0',0x71,',',0x72,'2',0x73,'5',0x74,'6',
0x75,'8',0x79,'+',0x7a,'3',0x7b,'-',0x7c,'*',0x7d,'9',0,0 };


flash unsigned char shifted[67][2] = {
//0x0d,9,
0x0e,'`',0x15,'Q',0x16,'!',0x1a,'Z',0x1b,'S',0x1c,'A',0x1d,'W',0x1e,'@',0x21,'C',0x22,'X',0x23,'D',0x24,'E',
0x25,'$',0x26,'#',0x29,' ',0x2a,'V',0x2b,'F',0x2c,'T',0x2d,'R',0x2e,'%',0x31,'N',0x32,'B',0x33,'H',0x34,'G',
0x35,'Y',0x36,'^',0x39,'L',0x3a,'M',0x3b,'J',0x3c,'U',0x3d,'&',0x3e,'*',0x41,'<',0x42,'K',0x43,'I',0x44,'O',
0x45,')',0x46,'(',0x49,'>',0x4a,'?',0x4b,'L',0x4c,':',0x4d,'P',0x4e,'_',0x52,'"',0x54,'{',0x55,'+',0x5a,13,
0x5b,'}',0x5d,'|',0x61,'>',0x66,8,  0x69,'1',0x6b,'4',0x6c,'7',0x70,'0',0x71,',',0x72,'2',0x73,'5',0x74,'6',
0x75,'8',0x79,'+',0x7a,'3',0x7b,'-',0x7c,'*',0x7d,'9',0,0 };
                       



//***********************************************
void main() {                                               	
	int i,j;
    	unsigned char ch,row;
	flash unsigned char *dataPtr, *tmpDataPtr;
	unsigned char messageLength, currentChar, charOffset, tmpCurrentChar, tmpCharOffset, ledArray[23];	
	unsigned char message[308];  // 300 chars + 4 spaces at start and end of message                   
	
	#asm("cli");    // disable all interrupts 
	// initialise ports 
	DDRA = 0xff;	// port A output 	
	DDRB = 0xff;	// port B output	
	DDRC = 0xff;	// port C output	
	DDRD = 0xeb;	// pins 2 & 4 inputs    
	
	// initialise keyboard variables
	inpt = kb_buffer; 
	outpt = kb_buffer;
	buffcnt = 0;
	bitcount = 11;
	
	// initialise lcd 
	lcd_init();       	    	            
	                                                 
	// initialise LED display (shift registers)	
	LED_RESET = 0;
   	LED_CLOCK = 0;
 	LED_RESET = 1;                  
	                  
	// initialise interrupt registers
	GIMSK = 0x40;	// enable INT0 interrupt
	MCUCR = 0x02;	// INT0 interrupt on falling edge    
	
	
   	#asm("sei");    // enable all interrupts
   	    
   	      
   	while(1) {
   		ch = 0x00;
    		i = 0;
    		// fill the array with 4 empty spaces at the start and the end of the message
		// as the screen has 4 chars
		// (it looks better if we start scrolling with empty screen and end
		// with empty screen , rather than displaying four chars immediatelly and
		// then start scrolling)
		message[i++] = ' ';   
   		message[i++] = ' ';   
   		message[i++] = ' ';   
   		message[i++] = ' ';    

		// enter message until 300 characters entered or <enter> key pressed  	        
    		while((ch != 13) || (i < 308)) {      
			ch = getchar();
			if ((ch != 13) && (ch != 'q')) {
				lcd_putc(ch);
				message[i++] = ch;
			}
			// if q is pressed clear the LCD 
			// (code only writes to the first LCD line so
			// if the line is longer than 16 chars i cant see the rest of the chars
			// , there will be a menu system in the future software version
			// and the line on the LCD will be scrolled 
			// to the left automatically as the cursor gets to the end of the line
			//, for now use this dirty solution:))
			if (ch == 'q') 
				lcd_clear();	            			
		}              
    		message[i++] = ' ';   
   		message[i++] = ' ';   
   		message[i++] = ' ';   
   		message[i++] = ' ';    	   	   	    
    
    		messageLength = i - 4;
    		charOffset = 0;
    		currentChar = 0;
    		dataPtr = &led_chars[message[0] - 0x20][0];    
    		
		// this loop is the heart of the scroll
		// message is scrolled until a key is hit on the keyboard		

    		while (!kbhit()) {     
    			// load led array   	
    			tmpDataPtr = dataPtr;
    			tmpCharOffset = charOffset;
    			tmpCurrentChar = currentChar;
    			for (i = 0; i <= 22; i++) {  
    				ledArray[i] = *tmpDataPtr++;  		    	   		    		
    	 			if (++tmpCharOffset==0x06) {  
    	  				tmpCharOffset = 0;    	  		    	  		
    					if (++tmpCurrentChar == messageLength)
    	 					tmpCurrentChar = 0; 
    	  				tmpDataPtr = &led_chars[message[tmpCurrentChar] - 0x20][0];
    				}      		
    			}
    			if (++charOffset == 0x06) {     
    				charOffset = 0;         		
    				if (++currentChar == messageLength)
    					currentChar = 0;	
    			}      
    			dataPtr = &led_chars[message[currentChar] - 0x20][charOffset];
    	    	
    			// display led array
    			row = 0x02;        
    			for (j = 0;j <= SCROLL_DELAY; j++) {  
	   			for (i = 0; i <= 22; i++) {
    					LED_DATA = (ledArray[i] & row) ? 1 : 0;
    					LED_CLOCK = 1;
    					LED_CLOCK = 0;    	
    				}                 
    				PORTA = row;  
 				row <<= 1;      // next line to be switched on         
 				if (!row) 	// if last line go back to the first line	
 					row = 0x02; 	  	 	  
 	  			delay_us(800);
 	    			PORTA = 0x00; 	    
 	   		}
    		}
		lcd_clear();	    
    }
    
        	       
} 

//***********************************************
// return 1 if a key is pressed (non blocking)
// else return 0 
int kbhit(void) {
	if (buffcnt) {
		// reset buffer variables (flush the buffer)
		inpt = kb_buffer; 
		outpt = kb_buffer;
		buffcnt = 0;
		bitcount = 11;
		return 1;		
	}
    return 0;
}

// puts scan code (in hex format) into keyboard buffer
// (used for debugging purposes)  
//***********************************************
void put_scancode_kbbuff(unsigned char sc) {
	unsigned char h,l;

	// convert hi and low nibbles of the scancode
	// into ascii and store them into keyboard buffer	
	h =  ((sc & 0xf0 ) >> 0x04) & 0x0f;
	if ( h > 9)
		h = h + 7;
	h = h + 0x30;
	put_char_kbbuff(h);             
	
	l = sc & 0x0f;
	if ( l > 9)
		l = l + 7;
	l = l + 0x30;
	put_char_kbbuff(l);
}       
//***********************************************
// keyboard ISR  
interrupt [EXT_INT0] keyboard_isr(void) { 
	static unsigned char data;	// holds the received scan code

	// function entered at falling edge of the kbd clock signal 
	// if data bit is the next bit to be read 
	// (bit 3 to 10 is data, start, stop & parity bis are ignored
	if((bitcount < 11) && (bitcount > 2)) {		
		data = (data >> 1);      
		if (KBD_DATA)			// if next bit is 1	 
			data = data | 0x80;	// store a '1'
		else 
			data = data & 0x7f; // else store a '0'
	}		
	if(--bitcount == 0) {		// all bits received ?		
		   	decode(data);       // decode received byte
			bitcount = 11;		// reset bit counter						
	}  
}               
//***********************************************
// decode scan code
void decode(unsigned char sc) {
 	static unsigned char is_up=0, shift = 0, mode = 0;
	unsigned char i;
 
	if (!is_up) {
		switch (sc) {
			case 0xF0 :// The up-key identifier
				is_up = 1;
				break;
			case 0x12 :// Left SHIFT
				shift = 1;
				break;
			case 0x59 :// Right SHIFT
				shift = 1;
				break;
			case 0x05 :// F1
				if(mode == 0)
					mode = 1;// Enter scan code mode
				if(mode == 2)
					mode = 3;// Leave scan code mode
				break;
			default:
				if(mode == 0 || mode == 3) {// If ASCII mode				
					if(!shift) {// If shift not pressed, do a table look-up
						for(i = 0; unshifted[i][0]!=sc && unshifted[i][0]; i++);
							if (unshifted[i][0] == sc) {
								put_char_kbbuff(unshifted[i][1]);							
							}													
					} 
					else {// If shift pressed
						for(i = 0; shifted[i][0]!=sc && shifted[i][0]; i++);
							if (shifted[i][0] == sc) {
								put_char_kbbuff(shifted[i][1]);
							}
					}
				} 
				else put_scancode_kbbuff(sc);	// scan code mode (debugging mode)								
				break;
		}
	} 
	else {
		is_up = 0;// Two 0xF0 in a row not allowed
		switch (sc) {
			case 0x12 :// Left SHIFT
				shift = 0;
				break;
			case 0x59 :// Right SHIFT
				shift = 0;
				break;
			case 0x05 :// F1 --  F1 puts you in debugging mode
				   // pressing F1 again gets you out of debugging mode
				   // in debugging mode hex code of the scan codes
				   // are stored in the buffer instead of their ascii codes		
				if(mode == 1)
				mode = 2;
				if(mode == 3)
					mode = 0;
				break;		
		}
	}
}                                                
//***********************************************
// store character in the keyboard ring buffer 
void put_char_kbbuff(unsigned char c) {
	if (buffcnt < BUFF_SIZE) { // if buffer is not full
		*(inpt++) = c;
		buffcnt++;
		if (inpt >= kb_buffer + BUFF_SIZE) // pointer wrapping
			inpt = kb_buffer;
	}		
} 
   
//***********************************************
// get next available character from the keyboard ring buffer
// (waits until a character is available in the buffer)
int getchar(void) {
	int byte;
	
	while (buffcnt == 0); // wait for data
	byte = *outpt; // get byte
	outpt++;
	if (outpt >= kb_buffer + BUFF_SIZE) // pointer wrapping
		outpt = kb_buffer;
	buffcnt--; // decrement buffer count
	return byte;
}
//***********************************************
void lcd_init(void) {
	delay_ms(50);
	LCD_E = 0;
	LCD_RS = COMMAND_MODE;	
	LCD_RW = WRITE_MODE;		
	delay_ms(1);
	LCD_DATA_PORT = 0x38;	// 8 bit, 2 lines, 5x8 font
	LCD_E = 1;	delay_ms(1);
	LCD_E = 0;	delay_ms(1);
	LCD_DATA_PORT = 0x0f;	// display & cursor ON, blink & underlined 
	LCD_E = 1;	delay_ms(1);
	LCD_E = 0;	delay_ms(2);
	lcd_clear();				 	
}                                         
//***********************************************
void lcd_clear(void) {  
	LCD_RS = COMMAND_MODE;
    LCD_DATA_PORT = 0x01;	// clear display
	LCD_E = 1;	delay_ms(1);
	LCD_E = 0;	delay_ms(2);
}                               
//***********************************************
// display char on lcd
void lcd_putc(unsigned char ch) {
	LCD_RS = DATA_MODE;             
	LCD_DATA_PORT = ch;
	LCD_E = 1;	delay_us(40);	        
	LCD_E = 0;	delay_us(40);
}                                                
//***********************************************
// display string on lcd 
// input: pointer to string stored in flash ROM
void lcd_putsf(unsigned char flash *str) {             
	while (*str!= '\0') {
    	lcd_putc(*(str++));
    }   
}     
//************************************************
//  same as above except the string is in RAM
void lcd_puts(unsigned char *str) {             
	while (*str!= '\0') {
    	lcd_putc(*(str++));
    }   
}

Click to expand...

michaelkaka said:

void lcd_puts(unsigned char *str) & void lcd_putsf(unsigned char flash *str)
these two functions are not included in the main function, are there some error in the code???

Click to expand...

rojo said:

michaelkaka said:

void lcd_puts(unsigned char *str) & void lcd_putsf(unsigned char flash *str)
these two functions are not included in the main function, are there some error in the code???

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there is NO error in the code, the code works perfectly with the schematics included.

i sent u a pm, but i will repeat it here , these two functions are not used in the code i posted in the forum, they are there for future use.lcd_puts prints string from RAM to lcd and lcd_putsf does the same thing but it gets string from ROM memory of 90s8535 / atmega32 (two chips i used, but please note that if atmega32 is used then some minor changes are required to interrupt init parts), the reason for two different functions is that these chips have different ways of accessing ROM and RAM. both functions use another function lcd_putc for sending single character to lcd. i did not use them in the code so they dont affect the output in any way. u can write your own lcd functions or use the ones that might come with your compiler, depending on the chip u use etc.


and i can see noone here has done something similar to my display i.e. connecting it directly to a PC keyboard, since i posted this code in the first page of this thread in 2004 , here is my prototype led display picture again
working with above first code version perfectly, no need for serial connection, no need for PC etc. the circuit u see next to the book on the picture is just a programmer hardware used for uploading the above code into the chip, in normal use of the display, it is not connected the above code cannot save messages into flash rom but that is easily done, if u can manage to understand the above core code then any other function u wish to add to my project can be easily done

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hareeshmohankavassery said:

i need that ic max6953 for doin my project....frm where we can buy it in india...anyone plese help me

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magnoedu said:

Dear Hugo00 y tryng to make the same display do you make, to put in my church,y have an questions yours dot is four leds, he is in series or parallel?
what the advantage to mic5841 over 74hcxxx
y make an sign board in this site
https://www.picbasic.co.uk/forum/showthread.php?t=6033
but not bright my leds only is visible in the shadow kkkk please help-me

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hareeshmohankavassery said:

if iam ordering for a free sample...will they send it within 2 weeks?????

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hareeshmohankavassery said:

still der is a pblem...it also uses a rare ic named uc5832a.....????? wat to do...relallyy am fed up by searching for max6953.......

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prateek000 said:

i want to make a 16x64 microcontroller based led moving message display ....can u plz help me ..? i want to know that which microcontroller shud be used in this much big moving message display... waiting for your response...

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