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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. 


Step 1: Materials

This project uses a lot of materials, so its best to have them all in one list. To build this completely, you will need

• 192 LEDs (LEDs can fail or be fried easily, so I recommend getting 200 even)
• 3 x 74HC595 shift registers
• 24 resistors (Use this to get the values you need (http://led.linear1.org/1led.wiz), you will have to know your LEDs forward voltage and current, as well as what you are supplying it with (in the case of arduino it is usually 5v sourced))
• 8 x 1k resistors
• 8 x 2N3904 transistors
• 1 x 4017 decade counter
• 1 x Arduino board or Atmega 328 chip. Make sure you have the tools to program it if you just have the chip
• Wire (lots of it!). I went through probably 50ft of wire making this. At least 50ft, if not more...
(A side note on the wire, solid core wire in a thin gauge (22-26ish), is very helpful when building this, because we will strip most of the coating of to solder it. If you can find some uncoated wire, that will help for most of the building process, and save you lots of time stripping wire)

• Tracing (sketching) paper. You can also use wax paper or parchment paper if you cannot find tracing paper
• Glue. I just used white Elmers glue and it worked great
• A foamboard panel (36 in long). I used this board from walmart, its just the right size. They had it in single-piece packages and were in the school supplies. Alternatively, you can use cardboard, or a similar type of board.
• Electrical tape (optional, but really useful)

Shameless plug- I get most of my parts from taydaelectronics.com- great store (especially for students on a budget :D), but shipping takes a while (~10 days). If you want to get it quick, I recommend Digikey or Mouser electronics. Great stores, and digikey usually gets to me in 2 days. 



<p>hello, thanks for the tutorial, I have run the code and not turn anything, should I change something in the code to turn on a led? and I checked piece by piece the electronics and everything is fine.</p><p>Greetings.</p>
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hey! I made it but I seem to have encountered some problems. Only some columns light up in lines and it does not seem to move or what. Do you know what could be causing this? I'm using the matrix loop code btw.
<p>Hello, I have made 8x8 circuit as you describe and its showing text as blocks and leds are not too bright. I checked 3 times if there is something connected wrong but it looks like it does not. Do you have any ideas where can be a problem? I am a newbie and also sorry for my english.</p>
<p>I am a beginner in arduino programming please tell me which programming is good. Whenever I will start the circuit..It will show me welcome..this type programming I needed</p>
<p>can this be applied to a smaller board that will either read cross/ do not cross?</p>
,can i integrate it with gsm module??<br>
<p>Good Proyect!!! Ya lo realice y me funciona bien, solo tengo problemas que al encender un led misteriosamente prende otro por ah&iacute;. Ahora mi intenci&oacute;n es realizar una meza de leds, y quiero ponerle algunos efectos. Alguien que me facilite la b&uacute;squeda de nuevos codigos tanks you!!!</p>
<p>can you help me in writing a code that displays a predefined text say like &quot;HELLO&quot;.</p>
<p>Did you know this was featured on belgian televison?</p>
Please share your modified code for 24x8 for Arduino
<p>i have created 24*10 perfectly running i have share codes soon i will upload more content stay tuned</p><p>@<br><a href="http://www.instructables.com/id/2410-LED-MATRIX-PERFECTLY-RUNNING/" rel="nofollow">http://www.instructables.com/id/2410-LED-MATRIX-PE...&amp;<br>@</a></p><p><a href="https://www.facebook.com/SparkingElectronics" rel="nofollow">https://www.facebook.com/SparkingElectronics<br></a>how to extend to more than 24 column i have hardware upto 48 column but no code pls share code.</p>
The first version of the code is up atm... will work on more code and refinements, but that should work.
Hello :) <br>Thank you for your nice project, I just wonder if I can have your help to make it 8x48 or 8x40 using 5 or 6 shift registers.. my problem is actually with the code .. I appreciate your help, it is urgent.. <br>Thank you in advance. my mail address is: maroof.ph@gmail.com
<p>i have created 24*10 perfectly running i have share codes soon i will upload more content stay tuned</p><p>@<br><a href="http://www.instructables.com/id/2410-LED-MATRIX-PERFECTLY-RUNNING/" rel="nofollow">http://www.instructables.com/id/2410-LED-MATRIX-PE...&amp;<br>@</a></p><p><a href="https://www.facebook.com/SparkingElectronics" rel="nofollow">https://www.facebook.com/SparkingElectronics<br></a>how to extend to more than 24 column i have hardware upto 48 column but no code pls share code.</p>
<p>i have created 24*10 perfectly running i have share codes soon i will upload more content stay tuned</p><p>@<br><a href="http://www.instructables.com/id/2410-LED-MATRIX-PERFECTLY-RUNNING/" rel="nofollow">http://www.instructables.com/id/2410-LED-MATRIX-PE...&amp;<br>@</a></p><p><a href="https://www.facebook.com/SparkingElectronics" rel="nofollow">https://www.facebook.com/SparkingElectronics<br></a>how to extend to more than 24 column i have hardware upto 48 column but no code pls share code.</p>
Can you do more than 8 rows? If so how would you connect 4017?
<p>i have created 24*10 perfectly running i have share codes soon i will upload more content stay tuned</p><p>@<br><a href="http://www.instructables.com/id/2410-LED-MATRIX-PERFECTLY-RUNNING/" rel="nofollow">http://www.instructables.com/id/2410-LED-MATRIX-PE...&amp;<br>@</a></p><p><a href="https://www.facebook.com/SparkingElectronics" rel="nofollow">https://www.facebook.com/SparkingElectronics<br></a>how to extend to more than 24 column i have hardware upto 48 column but no code pls share code.</p>
am i mistaken or do the shift registers on the bottom have 8 outputs on a side and the ones on top have 10?
Sorry for the late reply... The schematic or the board file?
both, one has 8 one has 10.
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 :)
<p>i have created 24*10 perfectly running i have share codes soon i will upload more content stay tuned</p><p>@<br><a href="http://www.instructables.com/id/2410-LED-MATRIX-PERFECTLY-RUNNING/" rel="nofollow">http://www.instructables.com/id/2410-LED-MATRIX-PE...<br></a>&amp;<br>@</p><p><a href="https://www.facebook.com/SparkingElectronics" rel="nofollow">https://www.facebook.com/SparkingElectronics<br></a>how to extend to more than 24 column i have hardware upto 48 column but no code pls share code.</p>
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
Simply the way the part symbol is in EAGLE. This <a href="http://electronics.stackexchange.com/questions/21074/why-are-555-ic-pin-diagrams-so-random" rel="nofollow">page</a>&nbsp;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.&nbsp;
That's what i thought seeing as it had 6 on the left side. Thanks for confirming. Im building it as we speak =]
http://www.electronics-lab.com/projects/mcu/026/index.html
its 24*6 eagle file <br>
I have made 32*8 hardwere succeess fully and all hardwere is ok but what to change in programming side?
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.
<p>i have created 24*10 perfectly running i have share codes soon i will upload more content stay tuned</p><p>@<br><a href="http://www.instructables.com/id/2410-LED-MATRIX-PERFECTLY-RUNNING/" rel="nofollow">http://www.instructables.com/id/2410-LED-MATRIX-PE...<br></a>&amp;<br>@</p><p><a href="https://www.facebook.com/SparkingElectronics" rel="nofollow">https://www.facebook.com/SparkingElectronics<br><br></a>how to extend column more than 24?</p>
<p>i have created 24*10 perfectly running i have share codes soon i will upload more content stay tuned</p><p>@<br><a href="http://www.instructables.com/id/2410-LED-MATRIX-PERFECTLY-RUNNING/" rel="nofollow">http://www.instructables.com/id/2410-LED-MATRIX-PE...<br></a>&amp;<br>@</p><p><a href="https://www.facebook.com/SparkingElectronics" rel="nofollow">https://www.facebook.com/SparkingElectronics</a></p>
<p>what were the specs on the power supply you used </p>
<p>If i use the 5mm LED, 20mA, do nice effect? </p>
Cool
<p>THANKS</p>
<p>Hello. I'm having a hard time getting the code to work. Could it be <br>because I use Arduino Mega 2560 R3? I see the usage of SPI in the code, <br>and apparently Mega 2560 R3 has the SPI in other place.</p><p>I'm <br> super new to this, so could anyone point me out what should I connect <br>to which pins (if I'm right about my issue to begin with) of Mega 2560 <br>R3? Thanks.</p>
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.
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) <br> <br>http://www.hebeiltd.com.cn/?p=zz.led.resistor.calculator
Thanks for this, I've been off the site for a long time. Sorry I didn't reply...
Thanks! Your code has more symbols then what Syst3mx had. Just what I needed <br>
Can you post a link to the eagle files
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 <br>http://www.electronics-lab.com/projects/mcu/026/index.html
http://www.electronics-lab.com/projects/mcu/026/index.html
Can you send me the eagle schematic please? <br> <br>
http://www.electronics-lab.com/projects/mcu/026/index.html
I have made 32*8 hardwere succeess fully and all hardwere is ok but what to change in programming side?
I have made 32*8 hardware successfully and all hardware is OK but what to change in programming side?
I have made 32*8 hardware successfully and all hardware is OK but what to change in programming side?

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