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boyironi
Joined: 08 Apr 2008
Posts: 4
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 09 Apr 2008 12:59 Re: dot matris program |
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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
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OBIALOR
Joined: 12 Nov 2005
Posts: 45
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| 09 Apr 2008 16:10 DIY Moving Message Display |
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| Hello Let me check your zip file and i will come back to you.
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baron88
Joined: 22 Mar 2008
Posts: 4
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| 11 Apr 2008 15:56 Re: DIY Moving Message Display |
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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
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boyironi
Joined: 08 Apr 2008
Posts: 4
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| 12 Apr 2008 7:17 Re: DIY Moving Message Display |
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hi
but i don't know assembly languge....
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bello1
Joined: 11 Oct 2007
Posts: 5
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| 12 Apr 2008 14:23 Re: DIY Moving Message Display |
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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.
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blueroomelectronics
Joined: 17 Sep 2006
Posts: 1229
Helped: 60
Location: Toronto, Canada
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| 12 Apr 2008 14:33 Re: DIY Moving Message Display |
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| bello1 wrote: |
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.
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bello1
Joined: 11 Oct 2007
Posts: 5
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| 12 Apr 2008 16:17 Re: DIY Moving Message Display |
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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.
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blueroomelectronics
Joined: 17 Sep 2006
Posts: 1229
Helped: 60
Location: Toronto, Canada
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| 12 Apr 2008 17:35 DIY Moving Message Display |
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| 800ma and a 1/7 duty is realistic. Just faster than 40Hz as it will flicker to some people but not to others.
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JAI MAA
Joined: 13 Oct 2007
Posts: 5
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| 17 Apr 2008 19:14 DIY Moving Message Display |
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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
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boyironi
Joined: 08 Apr 2008
Posts: 4
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| 18 Apr 2008 9:56 Re: DIY Moving Message Display |
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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...?
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JAI MAA
Joined: 13 Oct 2007
Posts: 5
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| 18 Apr 2008 20:17 DIY Moving Message Display |
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| any body give me circuit of led moving meesege display based on 89c2051
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pasicr
Joined: 13 Aug 2005
Posts: 261
Helped: 7
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| 18 Apr 2008 22:16 Re: DIY Moving Message Display |
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Hi,
look this
http://www.woe.onlinehome.de/e_projects.htm#ledfont
regards
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JAI MAA
Joined: 13 Oct 2007
Posts: 5
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| 21 Apr 2008 19:44 DIY Moving Message Display |
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| ANY BODY GIVE ME IDIA FOR HOW TO USE 74164 INTEAD OF MAX 7219 DOT MATRIX DRIVER
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pasicr
Joined: 13 Aug 2005
Posts: 261
Helped: 7
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| 22 Apr 2008 22:37 Re: DIY Moving Message Display |
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It is not possible,
74164 is ser / in par out shift reg,
max7219 is led display driver,
if you have a problem with buying max7219 (may be the price is problem) you can order FREE SAMPLE from
https://shop.maxim-ic.com/storefront/searchsample.do?menuitem=Sample&event=SampleSearchLoad
Regards
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srikanthkrj
Joined: 29 Mar 2008
Posts: 6
Location: INDIA
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| 24 Apr 2008 7:15 DIY Moving Message Display |
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cant we try in pic
pls givwe me hard and soft copy based on PIC controller
how to get on that one
pls help me on PIC progrramming:?:
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dotmatrix
Joined: 04 Apr 2008
Posts: 2
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| 01 May 2008 14:07 Re: DIY Moving Message Display |
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I made this project that scrol firt text from left to right and second text from down to up
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butch_pastor
Joined: 05 Nov 2007
Posts: 3
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| 06 May 2008 2:15 Re: DIY Moving Message Display |
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Hi! I am a newbie here and just downloaded the moving message display zip file. I am currently looking for ways to set up a moving message display with 10 pcs. 4 x 7 LED matrices. Is it possible to expand the 4 matrix moving message display circuit to 10?
Added after 27 minutes:
Correction!!!
I mean 7 x 8 LED matrix
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zuisti
Joined: 02 Jul 2004
Posts: 48
Helped: 2
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| 19 May 2008 16:42 Re: DIY Moving Message Display |
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Hi,
look at my last post here on this thema:
http://www.edaboard.com/viewtopic.php?p=1031743#1031743
zuisti
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valeryi
Joined: 05 Jun 2005
Posts: 18
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| 20 May 2008 13:13 Re: DIY Moving Message Display |
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| thank you
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rojo
Joined: 03 Jan 2004
Posts: 17
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| 23 May 2008 16:33 Re: DIY Moving Message Display |
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Hello everybody,
I am rojo, one of the first guys to post messages in this thread/topic
few years ago  ), (see the first page ), you can see there my moving message display, controlled by atmel uC, and a PC AT keyboard connected directly to uC,
all controlled by software written in C,
it`s very interesting to see how this thread evolved,lots of people actually contacted me
, and during this time, some of them actually rebuilt my display following my
schematics and instructions, some incorporated my keyboard part of the project
into their own.
Now i`m thinking of expanding the project, possibly building display with
two rows, controlled directly by PC keyboard, maybe usb version ,
and after that maybe even with wirelles keyboard . and with pc software
for downloading messages into display,
i.e. building something that could actually be sold for real money )
anybody interested in some sort of cooperation (software, hardware development or providing me with cheap bright LEDa, as I dont have much time
for fun these days, would be more than welcome.
or in general any questions regarding my original display would be more than welcome
bye
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conghieuhn
Joined: 28 Jul 2005
Posts: 7
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| 24 May 2008 8:20 DIY Moving Message Display |
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thnakssssssssssssssssssssssssss
Added after 1 minutes:
thnkssssssssssssssssssssssss
Added after 2 minutes:
thanksssssssssssssssssssssss
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OBIALOR
Joined: 12 Nov 2005
Posts: 45
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| 24 May 2008 18:24 DIY Moving Message Display |
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| conghieniun why thanks thanks,.
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zuisti
Joined: 02 Jul 2004
Posts: 48
Helped: 2
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| 28 May 2008 13:50 Re: DIY Moving Message Display |
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These are a beginner's first attempts, step by step.
I used the ELEKTOR's article (from 2001) as a starting point.
These are working in Proteus ISIS, so for the real-time simulation I made
many circuit simplifications (no row drivers, nor current limiting resistors..).
However, my friends builded the circuits yet (with my help) and all are working
as well.
All folders in the attached zip contain a working DSN file for ISIS, all sources
and the compiled HEX file too. There are also a screenshot ...
- ORIGINAL
89C2051, assembly. The article in PDF format and the original sources.
- MY_6CH
89C2051, assembly. HC164. Cascadable (pos switch), rs232 input
- MY_8CH
89C2051, assembly. HC595.
- SCROLL_8
89C2051, assembly. The first attempt to make a char by char scrolling...
- PIC_Scroll_C
PIC16F628A, MikroC. Switch to cascadable static / scrolling with speed switch
- PIC_Scroll_C_D
PIC16F628A, MikroC + CofMaker (for C source debugging)
- PIC_Scroll_PROTON
PIC16F628A, Proton Basic (PBP-like)
- PIC_Scroll_PROTON1
PIC16F628A, Proton Basic, v1.2, increased char buffer
Cheers
zuisti
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horsfab
Joined: 04 Jun 2008
Posts: 1
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| 08 Jun 2008 14:54 Re: DIY Moving Message Display |
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| Thanks guys this thread saved my life!
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pcup
Joined: 26 Dec 2007
Posts: 90
Helped: 13
Location: India
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| 08 Jun 2008 21:18 Re: DIY Moving Message Display |
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Hi all Dear Experts.
I am constant browser of this thread for updates.
Have look at attached files. !! award winning design.!!
but i think it is limited to fixed modules of matrix. is it possible to expand this desing to say 20 to 30 modules of dotmatrix.
Thanx
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valeryi
Joined: 05 Jun 2005
Posts: 18
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| 09 Jun 2008 6:25 Re: DIY Moving Message Display |
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| Thanks
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pcup
Joined: 26 Dec 2007
Posts: 90
Helped: 13
Location: India
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| 14 Jun 2008 1:15 Re: DIY Moving Message Display |
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Please help me to drive using I2C communication this Single Colored Led 5x7 dot matrix multiplexed with MAX6953.
Thank you
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joet_x
Joined: 08 Oct 2007
Posts: 9
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| 15 Jun 2008 14:58 DIY Moving Message Display |
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hi all
how to update display data at eksternal eeprom 89c51?? so display dot matix became adaptive and usefull.
thanks
Added after 3 hours 58 minutes:
thanks for all information. good luck
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sajal1975
Joined: 25 Mar 2005
Posts: 121
Helped: 3
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| 15 Jun 2008 18:45 Re: DIY Moving Message Display |
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| i want a simple 89c2051+led+moving+message+display+eeprom+ps2(keyboard)
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aladdin_2005
Joined: 23 Jun 2006
Posts: 6
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| 17 Jun 2008 3:15 Re: DIY Moving Message Display |
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| very good info thanks a lot
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