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Picture of LED Cube 8x8x8
Create your own 8x8x8 LED Cube 3-dimensional display!

We believe this Instructable is the most comprehensive step-by-step guide to build an 8x8x8 LED Cube ever published on the intertubes. It will teach you everything from theory of operation, how to build the cube, to the inner workings of the software. We will take you through the software step by step, both the low level drivers/routines and how to create awesome animations. The software aspect of LED cubes is often overlooked, but a LED cube is only as awesome as the software it runs.

About halfway through the Instructable, you will actually have a fully functional LED cube. The remaining steps will show you how to create the software.

A video is worth a thousand words. I'll just leave it up to this video to convince you that this is the next project you will be building:


I made this LED cube together with my friend chiller. The build took about 4 days from small scale prototyping to completed cube. Then another couple of hours to debug some faulty transistors.

The software is probably another 4-5 days of work combined.

 
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Step 1: Skills required

Picture of Skills required
At first glance this project might seem like an overly complex and daunting task. However, we are dealing with digital electronics here, so everything is either on or off!

I've been doing electronics for a long time, and for years i struggled with analog circuits. The analog circuits failed over half the time even if i followed instructions. One resistor or capacitor with a slightly wrong value, and the circuit doesn't work.

About 4 years ago, I decided to give microcontrollers a try. This completely changed my relationship with electronics. I went from only being able to build simple analog circuits, to being able to build almost anything!

A digital circuit doesn't care if a resistor is 1k ohm or 2k ohm, as long as it can distinguish high from low. And believe me, this makes it A LOT easier to do electronics!

With that said, there are still some things you should know before venturing out and building this rather large project.

You should have an understanding of:
  • Basic electronics. (We would recommend against building this as your very first electronics project. But please read the Instructable. You'll still learn a lot!)
  • How to solder.
  • How to use a multimeter etc.
  • Writing code in C (optional. We provide a fully functional program, ready to go)
You should also have patience and a generous amount of free time.

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amac_pt14 hours ago
Hi,
First of all thank you for this project and all your instructions.

I started my project but I made a huge mistake... I changed anodes with cathodes :((((. So I've anodes on layers and cathodes on columns...

There's any solution to solve this mistake ? (Different from to build led cube again)

Thanks
Hello
Thank you for the project, excellent work.
Can i use ic 74595 instead of 74574?
fake_cross3 days ago

Hello. I can not solve the problem, please help.

We have a minus (ground, GND) is common to a single layer (ie, all 64 LEDs hanging on one GND), power is supplied to the eight anodes (ie, taken separately column), and so for each column.For example, consider the work of two columns - I want to ignite in the first column of the 1st and 2nd LED, and the second column, only 1st LED.

How is it done? If power is supplied to the entire column, and minus (ground, GND) We submit on 1st and 2nd layer (ie. On the 1st and 2nd LED).

In such a situation should be lit and 1st and 2nd LED of both columns. It turns out that I can not light a single column on 1st and 2nd, and the second only 1st?

Thanks!

The layers are never connected to ground at the same time. We only ever draw 1 layer on the cube at a time, the we disable the outputs, load the data for the next layer, connect only that layer to ground, and re-enable the outputs. This is all done so quickly that it LOOKS like the whole cube is on, but in truth 2 layers are never enabled at the same time.

piddy0504 made it!6 days ago

I finally got round to finishing my cube and what a challenge its been.It currently runs on the 328P but i purposely left room on my board for it to be not to much hassle to upgrade to the Atmega32,but that is for a later date.I used Kynar wire through out my build as i think it is easier to solder and easier to keep track of where everything is going.Debugging was not to much of a pain as i tested all component before i soldered in place,however i still needed to replace 1 transistor and 4 LED and a couple of cold solder joints.Now its on to try and understand the code better so that i can add some real effects although i suspect this is not going to be as easy as the build.

IMAG0265.jpgIMAG0264.jpgIMAG0239.jpgIMAG0224.jpgIMAG0219.jpgIMAG0255.jpgIMAG0262.jpg

NICE JOB for a hand wired board! The cube is nicely made too. You can really tell when someone truly dedicates themselves to their work.Running Kynar to the layers is probably causing some dimming, but likely not enough to be an issue.

Cheers thank you for kind words and of course your code,it has given me hours of pleasure and i am really happy with the finished product.I used your method of bringing the anode to the side of the LED as i think i worth the time and lends to a far neater build of the cube,although i used a different method for bending.Also i bought some LED samples before i settled on ones i was happy with and was happy to pay extra for quality.Turns out that the kynar is not an issue on the layers as i was concerned about it having read on some post that i might be a problem.The next step is to upgrade to the 32 and that will be another learning curve.Video quality on the link below is poor but i will give you a glimpse of it working.

https://www.youtube.com/watch?v=AB4YSmCuXQ0

I want to start saying that this guide is totally awesome!! Following it i made my own LED Cube and it's fantastic! Now i'm trying to upload some effects. All is going well, but i have some problems with the 60th step. I'm running my cube with an arduino uno, and all effects work fine! But the shrink_grow effect (the woopwoop works!) is giving me some problem because i can't shrink the cube down to each of the 8 corners, even though i tried all the combination beetwen the ROT and FLIP parameters. The code screeshots aren't completed so i wrote the last part of the code by myself. I hope the problem are some rows of code written in the wrong way. Can someone help me please?

Thanks a lot and congrats again for the great work done!!

In void loop() I call the sub in this way:

for(int ii=0;ii<8;ii++)
{
effect_box_shrink_grow (1, ii%4, ii & 0x04, 450);
}

this is the code i'm using:

void effect_box_shrink_grow (int iterations, int rot, int flip, int delay)
{
int x,i,xyz;
for (x=0;x<iterations;x++)
{
for (i=0;i<16;i++)
{
xyz = 7-i; //this reverses counter i between 0 and 7
if (i > 7)
{
xyz = i-8; //at i > 7, i 8-15 decomes xyz 0-7
}

fill(0x00);
delay_ms(1);
cli(); //disable interrupts while the cube is being rotated
box_wireframe(0,0,0,xyz,xyz,xyz);

if (flip > 0) {mirror_z();} //upside-down
if (rot == 1 || rot == 3) {mirror_y();}
if (rot == 2 || rot == 3) {mirror_x();}

sei(); //enable interrupt
delay_ms(delay);
}
}
}

Snake 3D running in this cube:

http://www.youtube.com/watch?v=ERbs70HvVRs

power0001 month ago

hi , i have made CRR's led cube but something very strange is happening

there are led lighting that must not light. I have change emmitter with collector , i have use only one 2n222 as uperTech-IT says but nonthing good.

What have you used, atmega or arduino?

The Arduino is also ATmega in that the processor is an ATmega328P.

Most people prefer the ATmega32/32A/32L for this project though.

i use atmega

and of course i have place 8 pull up resistors on collectors ,6.2k

finally it works! there were many short circuits and tow transistor had electrik leak

Glad you got it all up and running! Hope to see a video of your cube in action!

https://www.youtube.com/watch?v=nrtCB4ZH8oo

Is there any program to control led cube and make coding easy ,just clicking on leds we want to gets on with the order we want?

Anesa19 days ago

Hello, I have a question:

stn1, s1(reset) and s2(rs232-mode) are momentary buttons or are on/off switches like the s1(power on)??

Thanks

Normally open momentary contact.

Thank you!!!!

In the resistor section, you mentioned that each LED was limited to 6.25 mA because of the 50mA limit on the latch IC. If you ran a 3.3V LED off of 5V, the resistor value would be (5V - 3.3V) / .00625A = 272 ohms. However, you eventually went with 100 ohm resistors. Could you explain why you went with the 100 ohm resistors and how that would work with the latch ICs? Any help would be appreciated. Thank you for the great project idea!

A lot of it has to do with the non-linear current draw of an LED as it approaches it's Vmax. I have discussed this in comments here before, plus you can get more info on the web about it. One of the factors is that we aren't putting DC into the LEDs, but rather a form of pulsed DC (sort of like PWM except we don't modulate the frequency, it's constant, and more resembles AC than PWM). There's a lot of things not taken into account, but 100 ohms is actually based a bit more on "close enough" rather than rigid calculations.

OK thank you!

I will re-state one thing here though...we use 100 ohms for the high brightness LEDs (usually blue or white) that have a higher Vmax than regular LEDs. 220-330 ohms are preferable for standard LEDs like red or green which have a lower breakdown voltage and are more easily damaged.

Could I use a USB-to-Serial FTDI breakout (https://www.sparkfun.com/products/9716) in place of the RS232-to-Serial chip? This would eliminate the need to run the cube off of an older Serial port/computer. I would also have to change the crystal, too. Any thoughts?

What is easiest is to use a USB to TTL serial adapter/dongle (about 2 bucks on ebay) and completely eliminate the MAX232 chip, connecting the adapter's TX line to the ATmega32 RX line (pin 14) and the RX line of the adapter to the TX line of the ATmega32 (pin 15) and ground to ground.

If you change the crystal of the ATmega, you need to change the speed in the MAIN.H of the code, or the serial won't work.

For example, 16MHz crystal with 38400 baud looks like this

// Define USART stuff

#define FOSC 16000000

#define BAUD 38400

#define MYUBRR (((((FOSC * 10) / (16L * BAUD)) + 5) / 10) - 1)

this section of the code makes using another crystal or a different baud rate very easy (not sure what the max baud is before you start getting errors)

My PC boards are designed to connect to USB to TTL adapters as I found this to be much easier than trying to find a computer with a serial port, or spending what it costs to get a USB to RS232 adapter.

Remember - the serial input is NOT FOR PROGRAMMING THE ATmega32 chip. It is only for running animation sequences from the PC (using PROCESSING or a similar language) and sending the cube frames to the cube serially.

TTL Serial.jpg

Could I just use the FTDI breakout from Sparkfun (above) instead of getting a different USB-TTL serial dongle? It looks like it does pretty much the same thing. The reason why I ask is because I already have the FTDI breakout for other projects.

Thanks for the help!

If you already spent the money on that one, sure. Same deal - TX to RX, RX to TX, and GND to GND. Ignore the other connections.

I just like the other dongles because they are only a buck.

http://www.ebay.ca/itm/USB-To-RS232-TTL-Auto-Converter-Module-Converter-Adapter-For-Arduino-S9-hv2n-/301019253456

tarek111 month ago

HELLO, i have made led cube 8*8*8 but the strange thing that there r some leds lighting when they shouldn' t i used an atmega 32A, i wonder if the hex file here doent work well with atmega 32A. thanks

If you read the comments that were right here at the top the day that you posted the identical problem, I think you'll find bad solder joints, or that you may have wired something wrong. A video will help, especially if you use my code with the power on self test, and video the test sequence. The code here - as with my code - work perfectly on the Atmega32 / 32A / 32L.

http://www.instructables.com/id/CHRs-8X8X8-LED-Cube-Revisited-with-improvements/step10/How-do-I-modify-the-software-Questions-Answers-and/

i have used 74LS574 not 74HC574 could that make problem?

74LSxx is made with bipolar transistors and there is a pullup resistor at the input. 74HCxx is made with CMOS transistos and the inputs are floating.

Short answer - no, this should not cause a problem. The LS are likely to draw more power from your supply than the HC as well, but not enough that it should cause any issues either as long as you have a half decent power supply (2A or more recommended)

i will try to post a video of my cube about transistor i have used BD 135 its an NPN 1.5 A transistor i just used 8 transistors .

if possible, upload MY code to the cube and make a video of the cube running the power on self test. That will help me pinpoint your exact issue.

I use 8 2N2222 transistors. Your transistors are not the issue unless you aren't driving them to saturation.

RAMP 1.0E Rev.4.jpg
tarek111 month ago

hello, i need help i have problem with my cube 8*8*8 i have used atmega32A i have some ledslighting when they shouldnt , i wonder if the firmawere in instructable dosn't work normally in atmega 32A. thank you

AlexC271 month ago

Hello, great project I really want to build it, but i can't download any file in this post, please can you send me the code of arduino to my email aj9202@hotmail.com thanks

rebeltaz1 month ago

I am confused regarding the selection of the LED resistors, partially because the voltage rating of the LEDs you chose is not specified. Blue LED voltage drop is typically around 3.2v give or take, so using that, the 5v supply voltage and the 100 ohm resistors you chose, I=E/R or I=(5-3.2)/100 or I=0.018a ... 18ma for each LED. While that is well within the typical operating range of the LED, it's far below the maximum peak current of most LEDs. Now, I understand that the maximum current ratings of the ICs must be taken into account, I'm just curious why we worry about the peak current of the LED if we can't drive the LEDs anywhere near that rating. Also, since we need to take into account the fact that the I/O pins of the flip-flops are limited to 25ma and the fact that there may/will be times when the IC must supply current to 8 LEDs on at one time, using R=100 and I=18ma for each LED, eight LEDs on at one time would be 144ma - FAR above the maximum current handling capabilities of the I/O pins.

Can you please tell me where I am wrong, because I know there is an error in my calculations somewhere and I am sourcing components for this as we speak. Thank you!

Many people made a lot of miscalculations in this project including CHR. The first mistake is using calculations assuming a DC current into the LEDs when they are never driven by a DC voltage - it is ALWAYS pulsed. We are driving the LEDs with a high frequency, never a static DC voltage. Basically, all the calculations you know kind of go right out the window because frequency is never part of them, and it absolutely must be, along with the ratio of on to off time. For instance, if you are pulsing an LED at 1Hz (just to make the mental calculation easier), at a 50% ratio, the LED is on for 1/2 a second out of every second. But if you only turn the LED on for 1 microsecond out of every second, you can see how the average current then drops drastically - the same way that if you only turn it off for 1 microsecond out of every second, it goes way up - even though the frequency remains the same. Since neither frequency nor pulse width are part of your calculations, they cannot be even close to being anywhere near accurate for the running circuit.

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