February 26th, 2008
Scrolling text display generated on 50×7 LED matrix with AVR AT 90S2313
Now this is a project to pay attention to. I dont know about you but i’ve always been a fan of scrolling text displays. This is cool. You can use it on pc casing moding, or anywhere else where you might want to add this nice effect. The text can be sent via RS232 interface from a computer, or it can be saved on a EEPROM memory. Fonts set of 256 different characters can also be programmed and mast be written to EEPROM before sending text to display. The author provides you with full info on building the project and also on the firmware.
May 26th, 2008 at 6:17 pm
Hy
Did anybody build this project?
because i need some help
thx
May 26th, 2008 at 9:16 pm
Hello Claudiu, I intend to build it soon, what problems did you encountered ?
May 26th, 2008 at 10:27 pm
i cannot write the font and the text in eeprom.
May 26th, 2008 at 11:19 pm
Claudiu you’re gonna have to be more specific than that.
May 27th, 2008 at 9:46 am
Florin, do you have a email address, where we can talk “more specific”?
May 27th, 2008 at 4:57 pm
Claudiu please post your question here. If i can help you I will.
May 27th, 2008 at 5:24 pm
I`m starting the program (leddisp.exe), then I`m opening the font (basic.ldf) and then when I click on the “Write font” button, it`s appearing the “Writing font” window and nothing it`s happening!
May 27th, 2008 at 7:35 pm
Claudiu, I’m sorry but i don’t know what is wrong on your setup. I will build the project soon so i will publish it on my personal projects page.
If you’d like to ask for help on AVR’s check the AVRfreaks forum.
May 27th, 2008 at 7:40 pm
ok. thanks anyway. i`m waiting for your project to be done.
good luck!
June 3rd, 2008 at 2:03 pm
Hey. i am also trying out this project, Claudiu did you sort your problem?
June 3rd, 2008 at 8:02 pm
By mistake I have wired the RxD of MAX232 to TxD of ATEML and TxD of MAX to RxD of ATMEL. Now it`s working verry good. I like it so much.
June 3rd, 2008 at 8:04 pm
Hey Claudiu, thats cool, maybe you can take some pictures of it so we can post them here on the site.
June 3rd, 2008 at 9:25 pm
Of course. But only in a few days, because I`m very busy right now.
June 3rd, 2008 at 9:37 pm
Okay, I’ll be waiting.
August 13th, 2008 at 5:28 pm
hi! I built this display, but i have the same problem as Claudiu, but not same mistake. the display is waorking, i put a the firmware from the original page to the microcontroller with a progamming board i made and it looks like it’s working. I cann’t “comunicate” with the display with it’s DB9. Maybe Claudiu colud help me.
PS: are you from Romania???
September 3rd, 2008 at 5:53 pm
hi. How could i get the circuit diagram and details of this project.
September 9th, 2008 at 3:49 pm
@Mircea
Yes, I`m from Romania. If you want to talk here is my email: claudiu_p2001@yahoo.com
@shaharia
on the bottom of that led display image there is a link.
http://www.ee.oulu.fi/~zyc/LedDisp/
May 20th, 2009 at 12:41 am
i just finished a similar display project. the only chalenge i have now is to write to the eeprom. can anyone please be of help?
May 20th, 2009 at 2:49 pm
what kind of problems are you facing?
May 20th, 2009 at 7:13 pm
all the data is writted in the EEPROM by the uC
January 9th, 2010 at 8:05 pm
what is the name of the transistor used. is it a powered npn or low current npn transistor
January 9th, 2010 at 8:24 pm
Hi, try the original project page for more info : http://koti.mbnet.fi/zyc/LedDisp/
January 9th, 2010 at 9:45 pm
Actually those are medium power npn transistors
January 12th, 2010 at 4:45 pm
please i need your help. we are making just like this project but it is now interfaced in the PC through serial bus (usb). 60 columns of led and 28 rows of led please can any one show you schematic diagram using the max6953 driver?? or e-mail to rob_ngek@yahoo.com. . .
please help me. . .
March 12th, 2010 at 9:51 pm
Hello ,
I have finished building the Project ,
Also programmed the Chip (i hope correctly),
Only having problem writing fonts in EEPROM using Leddisp.exe.
There are lots of reasons for that , some of them being , My laptop Lacks a COM port , I am using a USB to COMport adapter which is’nt working aswell.
I have built the whole project using PCB’s , so i dont think i have some wrong connections or something.
Is there a Possibility to Write/Save fonts on the EEPROM using a ISP (programmer) ?
Best Regards,
Lubnaan
March 15th, 2010 at 9:09 am
The cheap USB to Serial cables usually don’t work well on laptop computers because they don’t get enough power from the USB port.
May 18th, 2010 at 2:41 pm
ive been on this project too for over a year now, n i cant write the font to eeprom. i even edited my own font and wrote it to the internal eeprom of the attiny chip.nothing happens.claudiu, can i get to you for a detailed discussion on this?
May 20th, 2010 at 8:38 am
I`ll try to help you. My email is claudiu_p2001 @ yahoo . com
July 18th, 2010 at 8:58 am
hello claudiu:
i made this project font read/write in the eeprom is sucessfully working it mean connection and software well working but display frame with 7×5 leds all is on and scrolling not readable do you help me
July 23rd, 2010 at 7:48 am
can you be more specific?
all the leds are on, all the time?
July 29th, 2010 at 10:57 am
[...] to stick a microcontroller in there and write some code. You might want to check this other article 50×7 LED Matrix which has everything [...]
August 20th, 2010 at 4:15 pm
Hi, I want to make a large display for our disco. As anyone got an idiots guide on how to do such a project. I’m keen to do it but am not sure what I will need and where to start to be honest… Can anyone help me. Thank you
September 26th, 2010 at 6:42 pm
Ah, my need is similar to that of Valerie. I need a display for my shop. I won’t be using direct Pc interface. Instead of that, I am going to write the text in 24c16 or similiar eeprom, and the circuit will display each character right to left scrolling with a speed adjustable by preset/pot. A micro-controller using is not wanted, some logic circuit can do these work? if not then micro-controller. moreover that is to be built on veroboard. You may be laughing, but I’m new to such projects. I specialize in power electronics.
September 26th, 2010 at 6:43 pm
http://www.ee.oulu.fi/~zyc/LedDisp/ The link does not works. ‘Article removed’
November 14th, 2010 at 8:01 pm
hi how do you write a font to the EEprom. Please i need your assistance.