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bynz
Joined: 10 Jun 2006
Posts: 9
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 17 Jun 2008 12:46 Re: DIY Moving Message Display |
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| thanks
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davemaster
Joined: 23 Jan 2007
Posts: 85
Helped: 1
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| 17 Jun 2008 13:55 Re: DIY Moving Message Display |
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| NeoMatrix wrote: |
hello to all
can any 1 donate the 20 points to download the moving_message.zip
i appreciate
thanks |
Greetings,
hahahahahaha, good post....
Good Luck!
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deniah
Joined: 28 Nov 2005
Posts: 34
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| 20 Jun 2008 19:09 Re: DIY Moving Message Display |
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I need to do increase power suply for led display to +7V - 9V instead +5V wich is now. Row drivers is irf9530 (from mcu thru 1K on gate, +5V sors, drainon led row), and column driver is HC164 + ULN2803.
Instead of irf9530 I try with BD242 (and few others), but if I increase suply on emiter above 5.5V, transistor is fully conductive (colector - emiter), and every led is on. With +5V on emiter everything is ok, but leds are with verry poor light.
When I replace ULN2803 with 8xBS170 (n-fet), I have little better result but still not good enough.
All this is without current limiter ressistors.
Leds are red, 2 leds in series for 1 dot.
Regards
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zuisti
Joined: 02 Jul 2004
Posts: 48
Helped: 2
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| 23 Jun 2008 7:08 Re: DIY Moving Message Display |
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| deniah wrote: |
I need to do increase power suply for led display to +7V - 9V instead +5V wich is now. Row drivers is irf9530 (from mcu thru 1K on gate, +5V sors, drainon led row), and column driver is HC164 + ULN2803.
Instead of irf9530 I try with BD242 (and few others), but if I increase suply on emiter above 5.5V, transistor is fully conductive (colector - emiter), and every led is on. With +5V on emiter everything is ok, but leds are with verry poor light.
When I replace ULN2803 with 8xBS170 (n-fet), I have little better result but still not good enough.
All this is without current limiter ressistors.
Leds are red, 2 leds in series for 1 dot. |
Hi "deniah";
Seems the 5v (4.5V) doesn't enough to drive your 2 leds in series. Try and measure it as static!
Due the multiplexing method the current is theoretic 1/7 of the static current (for ex. if the static max. current is 40 mA, the average current is only 40/7 mA and it's too small). Of course only if you have seven rows...
But... this is the theoretic maximum, in your case it's far smaller I think. Please use for shift regs the hc595 instead of the 164, it has output latches too. This decreases drastic all the blank times.
To increasing of the led power for rows: simply use level shifter Zener diodes in serial on your 1K (from MCU). Use a 3v3 Zener. And apply also a B-E (G-S) resister (2k2...4k7) to all your row driver FETs or PNP darlingtons (!).
Use better leds (or NOT in serial but paralell)!
Hope this helps
zuisti
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deniah
Joined: 28 Nov 2005
Posts: 34
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| 23 Jun 2008 22:55 Re: DIY Moving Message Display |
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Hello zuisti
Thanks for reply
Unfortunately wont work. Now I need ~9v to get the same result, but when increase above 9V same thing is happening, all leds are on.
Regards
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lgeorge123
Joined: 13 Jun 2004
Posts: 50
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| 26 Jun 2008 14:24 Re: DIY Moving Message Display |
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Hi , rojo , in your code
row<<=1;
if(row==0)
row=0x02;
delay_us(800);
porta=0;
if I do not use the porta=0 , can you redesign the program replace the code
porta=0 ??????
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OBIALOR
Joined: 12 Nov 2005
Posts: 45
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| 28 Jun 2008 11:39 DIY Moving Message Display |
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| why dont you try to contact rojo through his private mail box
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yupng
Joined: 16 Jul 2008
Posts: 33
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| 16 Jul 2008 5:12 Re: DIY Moving Message Display |
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| can i have d hardware diagram
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ihtashan
Joined: 16 Jul 2008
Posts: 4
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| 16 Jul 2008 15:36 DIY Moving Message Display |
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Hi every one!
I am doing project which is display SMS on led dot matrix using AT89c51 microcontroller please help me
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bzorila
Joined: 29 Jul 2008
Posts: 2
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| 29 Jul 2008 20:47 Re: DIY Moving Message Display |
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Hy everybody!
Could you help me with the command of a matrix of 72*72 LED's (or bigger)? I have the PCB with the LED's already done, but I don't have any ideea how to drive them. 
This matrix must display animations and text (perhaps sent from a PC via COM port).
Any IDEEA?!?!?!
THANKSSS!!!
P.S. Please excuse my poor english...
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electronicus
Joined: 19 Aug 2005
Posts: 171
Helped: 12
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| 29 Jul 2008 21:47 Re: DIY Moving Message Display |
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| Ask Google : EPE Giant LED Message Display
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mansoorkhawar
Joined: 16 Feb 2007
Posts: 3
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| 01 Aug 2008 11:02 Re: DIY Moving Message Display |
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Hi Friends,
Going too good.i am a user of ATMEL AVR using C.Is anyone doing work on dual color 8*8 matrix and shapes as well as text scrolling left,right,up,down.If someone have links or any work on this,plz send me.
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deniah
Joined: 28 Nov 2005
Posts: 34
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yupng
Joined: 16 Jul 2008
Posts: 33
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| 04 Aug 2008 16:16 Re: DIY Moving Message Display |
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IF i use a keyboard to enter text then send it out via any wireless to the display board. How i send out the date from keyboard using wireless......
Anyone can help??
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jl_21
Joined: 04 Aug 2008
Posts: 12
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| 04 Aug 2008 16:35 Re: DIY Moving Message Display |
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do you guys have a program in picbasic for a moving message??
and what book do you suggest for me in studying how to program a moving message and how to create the circuit of the dot matrix display??
hope you guys can help me..
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electronicus
Joined: 19 Aug 2005
Posts: 171
Helped: 12
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jl_21
Joined: 04 Aug 2008
Posts: 12
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| 05 Aug 2008 5:12 Re: DIY Moving Message Display |
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is there anybody here who has a picbasic code for pic16f877a???
or even for any pic micros??
a circuit for the dot matrix display would also be useful
and if you dont mind can you post a:
block diagram
schematic diagram
and what book do you guys recommend me to use because i'm trying to study how to program and how to build a moving message using picbasic.
i hope somebody here can help me...
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yupng
Joined: 16 Jul 2008
Posts: 33
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| 06 Aug 2008 3:39 Re: DIY Moving Message Display |
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| how to send out the data from keyboard or PC (using any wireless) to the DOT-matrix display board with wireless connection??
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madicalphy
Joined: 22 Jul 2007
Posts: 35
Helped: 3
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| 06 Aug 2008 7:32 Re: DIY Moving Message Display |
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hi,
any one can help me to write a program of moving message display with pic16f877a, such that row are scan with cd4017 and colums are scrol with 74ls595.
code in proton basic or c , will be highly helping.
regards
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zuisti
Joined: 02 Jul 2004
Posts: 48
Helped: 2
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| 07 Aug 2008 9:58 My newest 16 char MMD with a small PIC |
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My project is finished (for the present) 
This is a new Moving Message Display with a PIC16F628A and 8(16) x 5x7 led matrix, working in Proteus but it's working as well also on the real hw.
It uses a new and fast algorithm, written in assembly too.
It is modular: it uses one or two same 8 char display unit(s).
Online commands (via rs232, in Proteus: in Virtual Terminal)
- scrolling by pixel or by character
- pause/continue scrolling
- on/off one pixel gap between fonts
- home function (back to the begin)
- append function (jump to the text end)
- max. 127 chars displayable text
- - - stored in the PIC's EEPROM
- - - last typed char is deletable (backspace function)
- scrolling speed up/down
- single step left/right
- ASCII char test
- multi language characters (also full Greek)
- default settings via switches
- get/store settings from/to PIC's EEPROM
I'm attached here the project (for 8 or 16 chars) with the hex firmware only, because I wrote the program in Proton but with many (70%) hard and hand optimalisation in assembly (for the speed).
I think it is not a human readable program, and sorry... it's not for public!
Please study also my previous posts at this thread if you want to build this!
Try it!
Edit:
About the source look at my next post here!
Last edited by zuisti on 08 Aug 2008 8:15; edited 1 time in total |
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jl_21
Joined: 04 Aug 2008
Posts: 12
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| 07 Aug 2008 18:11 Re: DIY Moving Message Display |
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| can i also see your code in proton? because i'm using proton as well
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OBIALOR
Joined: 12 Nov 2005
Posts: 45
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| 08 Aug 2008 0:10 DIY Moving Message Display |
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| let our projects or what we present to our members be helpful rather that confusion ,let borrowed example from the previous members who willfully give their works out for gratis
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zuisti
Joined: 02 Jul 2004
Posts: 48
Helped: 2
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| 08 Aug 2008 8:12 Re: My newest 16 char MMD with a small PIC |
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| zuisti wrote: |
This is a new Moving Message Display with a PIC16F628A and 8(16) x 5x7 led matrix, working in Proteus but it's working as well also on the real hw.
...
I'm attached here the project (for 8 or 16 chars) with the hex firmware only, beacuse I wrote the program in Proton but with many (70%) hard and hand optimalisation in assembly (for the speed).
...
I think it is not a human readable program, and sorry... it's not for public!
... |
Hi my dear friends!
If somebody is really interested to this project, please drop me a PM with your real email address and I'll post to this address the whole project with sources. You must understand I don't want to make it fully public, and please no else doesn't make that, and do not use it for commercial purposes!
I'm worked a lot on it!
However, as I wrote, the program isn't small, nor easy to understand, and it has many assembly snippets, so it is NOT easy portable (unfortunately).
But ... it is working fine.
(I'm working on it continually but now in C and with PIC18 and AVR uCs.)
Note this project is simplified for Proteus ISIS simulation: for example there aren't real line drivers nor real rs232 interface (only 1 transistor ), it's running now at 1 Mhz PIC clock because my PC is slow). To make a real circuit please also study the ELEKTOR pdf in my previous posts (attachments) on this thread!
If somebody want to build it, I'll help gladly in a PM.
zuisti
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madicalphy
Joined: 22 Jul 2007
Posts: 35
Helped: 3
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| 08 Aug 2008 11:24 Re: DIY Moving Message Display |
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| can you send me the libariey of 74hc595 used in ISIS, proteus, as i m using some older version that have not this.
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zuisti
Joined: 02 Jul 2004
Posts: 48
Helped: 2
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| 08 Aug 2008 11:54 A lib for 74hc595 in Proteus 7.2 |
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| madicalphy wrote: |
| can you send me the libariey of 74hc595 used in ISIS, proteus, as i m using some older version that have not this. |
Hi "madicalphy";
The attached lib (zipped Proteus's 74hc.lib) contains this IC.
This is working fine for me.
Maybe you must first delete any(? or its only) .IDX files in the LIBRARY folder !?!
zuisti
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madicalphy
Joined: 22 Jul 2007
Posts: 35
Helped: 3
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| 08 Aug 2008 11:59 Re: DIY Moving Message Display |
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thanks, i will try this, and inform u accordingly. wat about source code of moving message display, as i have send u a PM.
regrads
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yupng
Joined: 16 Jul 2008
Posts: 33
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| 13 Aug 2008 11:01 Re: DIY Moving Message Display |
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i need a software and hardware about dot matrix message display using wireless keyboard.
Use wireless keyboard to sent the data to dot matrix message display....
Anyone can help me???
Added after 44 minutes:
| electronicus wrote: |
Hi.
A nice Running Text Disply controled by a COP-8 microcontroler.
For programming use a standard PC keyboard wit an infrared data link. |
Do u have this COP-8 microcontroler program code
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electronicus
Joined: 19 Aug 2005
Posts: 171
Helped: 12
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yupng
Joined: 16 Jul 2008
Posts: 33
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| 13 Aug 2008 13:16 Re: DIY Moving Message Display |
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| yupng wrote: |
i need a software and hardware about dot matrix message display using wireless keyboard.
Use wireless keyboard to sent the data to dot matrix message display....
Anyone can help me???
Added after 44 minutes:
| electronicus wrote: |
Hi.
A nice Running Text Disply controled by a COP-8 microcontroler.
For programming use a standard PC keyboard wit an infrared data link. |
Do u have this COP-8 microcontroler program code |
Is this two file are machine code???
I cant understand d code. Beside .asm and hex file,still got any(another) file?
Added after 12 minutes:
| yupng wrote: |
| yupng wrote: |
i need a software and hardware about dot matrix message display using wireless keyboard.
Use wireless keyboard to sent the data to dot matrix message display....
Anyone can help me???
Added after 44 minutes:
| electronicus wrote: |
Hi.
A nice Running Text Disply controled by a COP-8 microcontroler.
For programming use a standard PC keyboard wit an infrared data link. |
Do u have this COP-8 microcontroler program code |
Is this two file are machine code???
I cant understand d code. Beside .asm and hex file,still got any(another) file?
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Anyone can change this project with other MCU and write d code for me. I really can't understand d COP-8 microcontroler code.
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yupng
Joined: 16 Jul 2008
Posts: 33
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| 18 Aug 2008 13:10 Re: DIY Moving Message Display |
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Anyone can help me do a "wireless announcement board" using dot-matrix.
The data(text) is send out from keyboard via wireless to dot-matrix display.
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