DIY Moving Message Display

[allaalla]

try to place your diagrams and details.

 

[NAresh123]

@tobb
can u send me source codes /hex file for display


Thanx

Added after 2 hours 42 minutes:

i need Complete hex & hardware for display

 

[baron88]

i have small disign for sign message if any one nead it complet project

 

[Aurbo]

Well, I just spent the better part of 4 hours reading every post in this 15 page thread.. interesting reading.

What I am looking for is as follows.

A 4 digit clock circuit that uses a PIC and TPI6B595N shift registers to allow for large segments of led's in series to create each segment.

I am also looking for a scrolling led matrix that is 8x40 or 16x64 that will do simple text,animation and clock.

Any suggestions?

*EDIT
I should mention, One thats been built by the suggestor, not just a random link pulled of the 'net

Cheers

 

[penoy_balut]

Hi penoy_balut...
Nice Project can we have more details of project...

Thanx

I'm uploading it after the schematics and hex are ready.

 

[J0ker]

Hey

Has anyone done the Mini Scrolling LED Sign Kit before?
**broken link removed**

I am trying to do a program for it. I can't seem to get anything displayed an the LED screen. So I need some help on code I know C and assembly code.

I need a lot of help.

no one?:|

I guess not

 

[advance]

can anyone send me the code that move image display to right in assemblly using AT89c51 or AT89c2051 on 10*16 dotmatrix. i dont know how to save shape of the charactors on Eprom n how to make message move when its a long sentence.plz help me

 

[tumee]

help me how do assembler progeam of LED display use 8051

Added after 15 minutes:

please anyone give me this scames asm program

Added after 4 minutes:

hi everybody
help me for assembler program of this scam please help me

Added after 43 minutes:

if who know this projects assembler code help me

 

[tumee]

if who know this projects assembler code help me

 

[boyironi]

hi again...

lesen guys ! im try ing to control my led display board by serial port or keyboard(which is better) but the program which i have is just for scrolling the text and even this text is in the flash of micro but i need to keep my charachter in the external (or internal) eeprom and then i call them according to the text which is requested by keyboard ... but i can't do it becouse im not very good in programing and olso i didn't findout the logic of how to do it !!!
can any one help me to improve this program to : getting text from keyboard and save it in the eeprom micro and show it , untill next text entered .(EVEN if we turned it off , it show that text after re turning on) ???

by the way, im not english and my alphabet is " persian" can any one guide me how to change english base of ' getting characters of keyboard ' ?

or donate me 100 points to download this files and study them?

 

[boyironi]

Re: dot matris program

isn't there any one who help us???

may someone describe this code for me?
Sub Loadbuffer
'Load Display Buffer "
Itmp1 = Len(stringout)
Dspcnt = 1
For Charcnt = 1 To Itmp1
Stmp1 = Mid(stringout , Charcnt , 1)
Btmp2 = Stmp1

For Charsegment = 0 To 5
Lookupcnt = Btmp2 - 32
Lookupcnt = Lookupcnt * 6
Lookupcnt = Lookupcnt + Charsegment
Tmp = Lookup(lookupcnt , Asciitable)
Dspbuff(dspcnt) = &HFF - Tmp
Incr Dspcnt
Next Charsegment

Next Charcnt
Bufferlen = Dspcnt

End Sub

how does it findout that should catch which character from the asciitable ?
:?:

Added after 35 minutes:

this is a program which i found in internet on my searchs.perhaps be good for some one

 

[OBIALOR]

Hello Let me check your zip file and i will come back to you.

 

[baron88]

Hi every one this project I made it . All is ok working but found shadow follow my massage. i dont know if can solve this problem.
i used at89c52 - 74138 - 4028 as shift registry

ASM code

org 0000h
l6: mov dptr,#100h
acall program

ajmp l6

program: MOV R7,#56H
L8: MOV R2,#30H
L12: MOV R0,#00H
MOV R3,#00H
MOV R1,#20H
L11: MOV P3,R0
MOV A,R3
MOVC A,@A+DPTR
MOV P1,A
ACALL DELAY1
INC R3
INC R0
DJNZ R1,L11
DJNZ R2,L12
INC DPTR
DJNZ R7,L8
ret

DELAY1:
MOV R6,#01H
L4: MOV R5,#035H
L3: DJNZ R5,L3
DJNZ R6,L4
RET

ORG 0100H

DB 80h,0ffh,0ffh,0ffh,80h,0b6h,0b6h,86h,0ffh,0ffh,0ffh,80H,0BFH,0BFH,0BFH,0ffh,0ffh,0ffh
DB 80h,0beh,0beh,80h,0ffh,0ffh,0ffh,80h,0b6h,0b6h,80h,0ffh,0ffh,0ffh,80h,0f7h,0f7h,87h,0ffh,0ffh,0ffh
DB 80h,0f7h,0f7h,87h,0ffh,0ffh,0ffh,80h,0b6h,0b6h,86h,0ffh,0ffh,0ffh,80h,0beh,0beh,80h
end

 

[boyironi]

hi
but i don't know assembly languge....:|

 

[bello1]

IS THERE ANY FREE WARE OR JAVA POWERED PAGE WHERE I CAN GENERATE
CHARACTER FOR OTHER DISPLAYS THAT MAY NOT NECESSARILY BE 5 BY 7 MATRIX? I MAY HAVE TO MAKE A DOT MATRIX THAT IS NOT USING 7 BY 5 MATRIX. AGAIN I PLAN TO HAVE 80 COLUMNS AT 40HZ SCANNING RATE. DOES IT MEAN I MAY HAVE TO APPLY 800ma CURRENT TO GET SAME INTENSITY AS 10ma CONTINOUS CURRENT?PLEASE I NEED TO HERE FROM MY FRIENDS OUT THERE.

 

[blueroomelectronics]

IS THERE ANY FREE WARE OR JAVA POWERED PAGE WHERE I CAN GENERATE
CHARACTER FOR OTHER DISPLAYS THAT MAY NOT NECESSARILY BE 5 BY 7 MATRIX? I MAY HAVE TO MAKE A DOT MATRIX THAT IS NOT USING 7 BY 5 MATRIX. AGAIN I PLAN TO HAVE 80 COLUMNS AT 40HZ SCANNING RATE. DOES IT MEAN I MAY HAVE TO APPLY 800ma CURRENT TO GET SAME INTENSITY AS 10ma CONTINOUS CURRENT?PLEASE I NEED TO HERE FROM MY FRIENDS OUT THERE.

40Hz is too slow, 50Hz is better.
Assuming you're building a 7x80 display the current would be 800ma @ 10ma per segment. Not unrealistic.

 

[bello1]

does anyone have idea of how to use external eeprom to store font lookup table and using serial communication from a terminal windows to type in your message, i may have to use up to forty columns

Added after 7 minutes:

bluemmetronics i dont think i am being unrealistic, i saw a guy who used atiny for his project and he wanted to explain the scanning stuff, but he said in his explaination that because the leds have to be on for a short time, you had to apply much more current and even went as far as showing how to do the calculation, so that was how i arrived at 800ma, but i am feeling that would be too much and that is why i had to come to the forum.
as for 50hz the guy advised that if your ac is a 50hz line, you should not use 50hz and same apply if you make use of 60hz ac line, he suggested between 40 and 70hz, you can check from wanadoe.com or something like that for the projects.
any comment? i am waiting and online now.

 

[blueroomelectronics]

800ma and a 1/7 duty is realistic. Just faster than 40Hz as it will flicker to some people but not to others.

 

[JAI MAA]

any body help me about 89c51 moving massege display with software



thanks

Added after 13 minutes:

any body sene me compleate guide about 89c51 moving messege led display

 

[boyironi]

ah...it's a death topic...
why no body help us??!!
theres no one who know that part of tobbo program(which i wrote ) and describe it !? :|

Added after 4 minutes:

no one can tell me how would the program find out that which character must be shown...?