LED Sign with MMC Memory card
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History
At the beginning this project was to buy a led sign to interface with my home automation network. This automation network display information like temperature, wind speed, humidity, etc. I had bought on EBay a LED Sign but when I received it I got a surprise! There was no serial port to program messages… After a couple of days, I look inside to see how it was built.
The principle of operation is simple you have just 160 bits shift register with drivers for LEDs. I removed the old CPU from the LED sign and connected a couple of wires to the shift register (column driver) and the row driver to an ATMega128. The main reason why I chose to use an ATMega128 was the need of a large amount of RAM. I decided to use a MMC memory card to store all the messages for 3 reasons: low cost, SPI interface and a lot of space for messages.
Features
- 3 Colors messages
- 5 Scrolling speed
- Serial port for uploading messages
Pictures
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31 Comments to “LED Sign with MMC Memory card”
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Please note
All my source codes were taken from my personal projects.
Everything is for your information only. The C/C++ codes have been written
with ICCAVR. You can find the header and source CRT files by downloading their compiler.
All is for your information and everything is AS IS without any warranty of any kind. No other files are available and I don't make any modification for any body.
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for every tin tanks… but have can we use this projeckt whitout pc prgram ????
Yes you can it need only a terminal software
hi.ı have got a moving led sing.ı look your borad schematic and mcu schematıc.your schmatic board with my floating the same type of circuit.ı want to rebuilt my led sing with mmc card.is atmega 128 reading directly the sourche code from mmc card? ı can not to upload the sing.c file to atmega 128.other source code is diffrent.what do work other source codes?
I don’t have any other source code, but the one you take on my blog work,
Does the data displayed on the LED matrix is taken from mmc?
TQ
Yes in a text file
Hi Sylvain
hex file to an e-mail atmega chipset
good work
Ercan ADİL
hi friend
is this moving sign realy werks??
please reply me soon.
thank you
Why it should not work?
Hello. Thanks for the information. How flash player (*.swf ) by mmc in micro loading. Please answer. Good luck.
I don’t understand your question
hi I Made an Animation by swish max that its format is (.*swf) and I want to play it by led sign with mmc card but I can not please help me . excuse me I AM Forein and I can,t speak english well . very tanks.
Hi yonder,
Yes, I'm seriously enjoying all your projects. thanks to your Father. Well, I'm a complete novice to programming. really, I've being doing some projects on programming downloaded from the nets. but my problem is how to write the programs. Please, I want you to share few ideas with me. or if you can refer me to where to learn better.
Hi,
First thanks for your good comments, For MCU programming you must begin at the beginning, make a led flash, make this led fast at the speed of a potentiometer, make a night rider, and so on you can’t build a MP3 player after one year of programming. it’s a long lurning curve.
Good luck
Sylvain
hi.. first, thanks for this project..
I have some question…
how many animation can present in this led sign (just like: scroll right to left, up to down or still text)..?
how size memory card can use for this project..? 8MB, 16Mb or bigger…?
thank you…
Only text, no annimation, there is no MMC PC compatible it’s only for the internal system
can i program the display with keyboard
can i program the display through computer key board
Yes via you PC with hyperterminal
What is the hyperterminal values?
I don’t remember it’s make to long time
Study, read, try
c code to the web there m sorry
I’m so busy, I don’t have time to wrote application note, part list, and huge description of my work sorry
Sylvain
Hello,
I want to build this project.
Just must write in MMC memory card a text file "Hello world!" and will display it on Led sign?
What is the name of text file? The name of file can be "test" and the text "Hello world!"
Will works?
Thanks!
No there is not fat in this project the MMC driver is in the MCU code and it’s not compatible to anything
Sylvain
Thanks for quick answer.
I mean after I will write the hex code on MCU, I will use a MMC where I have written a text file like test.txt with the text "Hello world!".
Should be work like this?
Thanks
No it's not fat compatible the MMC is only for the MCU read and write there is nothing to do with your PC
I read above and understand that the MMC is written with a terminal software.
This terminal software is separated? Where can I take this?
Thanks a lot!
Hyper Terminal in windows
Merry Christmas and Happy New Year!!!