There are some things that you can never stop. After building Aurora 9x18, I just could not shake off wondering, what if I made it bigger...
So I finally broke down and made a bigger version of Aurora 9x18, Aurora 18x18.

Just as the name implies, it has twice the number of LEDs. The overall dimension is seven inches in diameter. They say bigger isn't always better, but in this instance bigger is indeed better.

*** The kits and PCBs are available at http://www.theledart.com/blog/aurora-18x18 ***

Step 1: Background

Those who are not familier with my Aurora 9x18, please view its instructables here.
Aurora 18x18 is built upon the same foundation. Special PWM technique enabling just one microcontroller to control 18x3(R/G/B) channels of brightness levels, without specialized LED controller ICs.

In addition to doubling the number of LEDs, Aurora 18x18 has a built-in infrared remote receiver. Now you can control this beauty from across the room, without leaving your chair.

<p>Awesome work! Looking forward to make one :) It just looks perfect.</p>
hahahaha &quot;bigger is indeed better&quot; ... so true dude! great work i think i am going to build something similar after finishing my exams ^^
hi can you provide me detail for some discussion <br> <br>email: subrotradeindia@gmail.com
Although I don't own either and thus can't be certain, the PIC runs as 32 MHZ, so 8MIPS to be the same thing as the 1M 5050 RGB LED strips available on LD-----http://www.linkdelight.com/EL07-5M-300-LED-Red-Green-Blue-Flexible-Light-Strip-Remote-3528-SMD.html
Hey Ledartist, great upgrade! <br> <br>I don't understand something about the PWM concept. <br> <br>You say the PIC runs as 32 MHZ, so 8MIPS. <br>You write that the width of the chart in your 9x18 instrutable is 8.1 ms. <br>8000000 / 1000 * 8.1 = 65536 <br>SO the width of the chart is 65536 instructions. <br> <br>There are 256 PWM steps and each step is split into three substeps. <br>65536 / 256 / 3 = 85 <br>If the maximum width of each substep is 85 you cant increase the length of each pulse 256 times, but in the graph in the 9x18 instructable, this is what happens. <br> <br>What am I missing? <br>
PIC24F is 16 bit microcontroller, running at 32MHz gives 16MIPS. (the architecture is different from 8 bit ones) &nbsp;Shortest pulse this PIC can produce is 62.5ns.<br> <br>Not sure if I understand what you are saying, but my implementation on Aurora only has 128 levels of brightness levels.<br> <br>R/G/B channels each go through 127 varying width of pulses to form equivalent of one phase of PWM output. The basic idea is to control the PWM output in exponential curve, instead of linear typical of usual PWM. And to control multiple LEDs, hardware produced pulses are multiplied with the software controlled output pins to keep the timing precise, and reduce the processing time.<br> <br>My implementation also has a benefit of reducing visible flicker, by breaking up each PWM cycle into subcycles - similar to spread spectrum technique used by specialized LED controller chips.
hey ledartist, great work!<br>can you send me/ or post a complete list of parts for the Aurora 18x18 like the 918-Bom.csv for the dikikeys site.<br>please, i don&acute;t find the corecct parts.<br><br>best regards and thank for the help
Parts come from a few different places now. Let me know which one you are having problems locating.<br> <br>
Thanks, i&acute;ve already the parts. are these the correct ones<a href="http://flic.kr/p/bN2bgz" rel="nofollow"> http://flic.kr/p/bN2bgz</a>
Oh no I've forgotten the transistors and the wrong PIC MMBT2222A ordered.
looks good to me...
Beautiful art! <br><br>Do you have any plans to make a larger version of either the 9x18 or 18x18 i.e. the same number of LEDs but spaced further apart?
Possibly, in the near future...<br> <br>
This is just amazing! So much went into it! Definitely going on my project list!
Great job, thanks for sharing.
Amazing and beautiful, this is going on my future project list!<br>
Aki San,<br>18X18 looks great.<br>What is the price of fullly assembled unit?
Hello Sree,<br> <br> How are you?<br> <br> I have not decided if I sell assembled units. It takes hours to assemble those, so I can't make that many...<br> <br> Thanks,<br> Aki
Another stunning piece of work. I especially love the colour organ mode!
Thanks Jeff!<br> <br> Yeah color organ mode looks a lot better than I imagined. The idea was around for a while, then I finally did it, and I'm glad that I did.<br> <br> Aki
Think I could buy a PCB prepunched from you?
I will make the PCB available for purchase very soon. Check back my website http://theledart.com for info.<br><br>Thanks,<br>Aki
A thing of beauty. Thanks for sharing<br>Thomas
Thanks for looking!<br>
Looks great!

About This Instructable


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Bio: I am an electronic artist living in Brooklyn, NY. I work with LEDs and microcontrollers to create beautiful objects.
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