Instructables
Picture of Make a giant LED sign! (24x8 Matrix)
UPDATE!! Schematic is ONLINE!
UPDATE 2!! Code is ONLINE!

This project details my rather rapid build of a 24x8 matrix. 

My inspiration for this project came from Syst3mX's 24x6 matrix. A 24x6 matrix was huge, but it just was too small for me, as not much can be done in only 6 lines. My goal was to increase the line count on that display, so I could have a few extra pixels. 

Basically this is just a 24x8 matrix with a cool, interlocking foamboard grid that makes it possible to have a really big display. This display is 3 feet long, and just over a foot high! Thats half the size of a large, flatscreen TV! Plus, the whole thing is arduino controlled, so you can program it to do other cool things, besides just showing text! :)

I am just also a high school student, and i love to make stuff. So would you consider voting for this project in the current contests? Thanks!


Difficulty: This project will be pretty simple for an expert, but a beginner will struggle with it. Better for those who have had some experience with soldering/building circuits.

Cost: The entire project can be done for less than $70, much less if you already have an arduino board.

Time: 2 weekends or about 1 full season of Star Trek's work. 


 
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If i use the 5mm LED, 20mA, do nice effect?

Nichjay176 months ago
Cool
RIJO VADAKKAN made it!7 months ago

THANKS

12032014121.jpg
HLEV8 months ago

Hello. I'm having a hard time getting the code to work. Could it be
because I use Arduino Mega 2560 R3? I see the usage of SPI in the code,
and apparently Mega 2560 R3 has the SPI in other place.

I'm
super new to this, so could anyone point me out what should I connect
to which pins (if I'm right about my issue to begin with) of Mega 2560
R3? Thanks.

Mega2560_R3_Label-small-v2.png
TAPAN MOJIDRA10 months ago
I have made 32*8 hardwere succeess fully and all hardwere is ok but what to change in programming side?
astroboy907 (author)  TAPAN MOJIDRA9 months ago
Honestly, I don't even know. If you have the hardware right, I have been asked for help making a 32x10 matrix. I'd be glad to help you with the code where I can, but a lot of it I don't understand right now. Sorry for the super late replies, I've fallen pretty behind in my electronics hobby.
profort11 months ago
As a continuation of the post above for myself. How much would it cost, can it be AC powered and what if I want maximum brightness.
Hassanul_ profort9 months ago
Yes you can. You can use a 5v wall wart that supplys about 1 amp or more. ( You could use a cellphone charger too). For full brightness, I recommend that you use the resistor calculator below. (Use the 'Leds in parallel' option)

http://www.hebeiltd.com.cn/?p=zz.led.resistor.calculator
astroboy907 (author)  Hassanul_9 months ago
Thanks for this, I've been off the site for a long time. Sorry I didn't reply...
Hassanul_9 months ago
Thanks! Your code has more symbols then what Syst3mx had. Just what I needed
Tim20131 year ago
Can you post a link to the eagle files
astroboy907 (author)  Tim20131 year ago
posted! There is also a very basic board layout- I am not very good at creating layouts so do with that what you will.
24*6
http://www.electronics-lab.com/projects/mcu/026/index.html
http://www.electronics-lab.com/projects/mcu/026/index.html
The_Tom1 year ago
am i mistaken or do the shift registers on the bottom have 8 outputs on a side and the ones on top have 10?
astroboy907 (author)  The_Tom1 year ago
Sorry for the late reply... The schematic or the board file?
http://www.electronics-lab.com/projects/mcu/026/index.html
its 24*6 eagle file
both, one has 8 one has 10.
astroboy907 (author)  The_Tom1 year ago
The 4017 has 10 outputs, so you can theoretically have a 24x10 matrix with this layout. I just did not have enough LEDs to make that though :)
But both of these have 8 rows.. I was just wondering why in the picture the right side of the 74hc595 has 10 legs on the right side in the top picture and 8 legs on the right side in the bottom picture
astroboy907 (author)  The_Tom1 year ago
Simply the way the part symbol is in EAGLE. This page explains some more about it. The top picture represents the part symbols in the EAGLE library, the bottom picture show how the connections would be routed in physical reality. 
That's what i thought seeing as it had 6 on the left side. Thanks for confirming. Im building it as we speak =]
opatil11 year ago
Can you send me the eagle schematic please?

http://www.electronics-lab.com/projects/mcu/026/index.html
TAPAN MOJIDRA10 months ago
I have made 32*8 hardwere succeess fully and all hardwere is ok but what to change in programming side?
TAPAN MOJIDRA10 months ago
I have made 32*8 hardware successfully and all hardware is OK but what to change in programming side?
TAPAN MOJIDRA10 months ago
I have made 32*8 hardware successfully and all hardware is OK but what to change in programming side?
TAPAN MOJIDRA10 months ago
I have made 32*8 hardware successfully and all hardware is OK but what to change in programming side?
TAPAN MOJIDRA10 months ago
I have made 32*8 hardware successfully and all hardware is OK but what to change in programming side?
TAPAN MOJIDRA10 months ago
I have made 32*8 hardware successfully and all hardware is OK but what to change in programming side?
TAPAN MOJIDRA10 months ago
I have made 32*8 hardware successfully and all hardware is OK but what to change in programming side?
TAPAN MOJIDRA10 months ago
I have made 32*8 hardwere succeess fully and all hardwere is ok but what to change in programming side
TAPAN MOJIDRA10 months ago
I have made 32*8 hardwere succeess fully and all hardwere is ok but what to change in programming side
TAPAN MOJIDRA10 months ago
can i expand up to 32*8??
please reply fast
I have made 32*8 hardwere succeess fully and all hardwere is ok but what to change in programming side
branx861 year ago
Can you do more than 8 rows? If so how would you connect 4017?
krzxsiek1 year ago
Hi! How display static text? No scrolling?
There is no displaying static text code. Would be very helpful.
I want display the time & temperature without scrolling. I'm noob with C programming :D
Please for help and sorry for my english :)
i,ll put a MAX232 on mine so that i have serial communication.
brenryan1 year ago
Nice work. Would it be possible to display RSS feeds or email headers? Either connected to a PC or using an ethernet shield?

Ideally I would like to have one of these displaying time with a RTC module occasionally scrolling with news/weather/email inbox info with an ethernet module and prehaps actual temperature info from sensors. Unfortunately that is way beyond what I am capable of, coding wise. My soldering and hardware ability is good, but just learning to program.

It would be nice if the Arduing LCD library could be modified so you could control a sign matrix such as this just like a big LCD display. Do you think this would be possible?

Anyways, great work. Thanks for the inspiration!
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