This Instructable is my entry into the Halloween contest. If you like it, please remember to vote.

Fog machines are common equipment when it comes to Halloween, but they have their drawbacks. They shoot fog in only one stream, and the fog is limited to the color white. Now you will be armed with knowledge about how to create a fog spreader that has colors which you can change with the flip of a switch.

Step 1: Materials

For this you will need:

  • Fog machine.
  • 2 sections of PVC pipe.
  • PVC T fitting that fits your pipe
  • 12 bright red LED's
  • 12 bright blue LED's
  • 1 SPST (single pole, single throw) switch
  • 1 SPDT (single pole, double throw) switch
  • Soldering supplies
  • Wire (several yards)
  • Hot glue and hot glue gun
  • Drill with 1/2 in bit and 5 mm (or close) bit.
  • Epoxy
  • Cable ties
  • X-acto knife
  • Tape measure
  • Piece of scrap wood
  • Some sort of strong tape (Foil tape is recommended. This stuff is amazing)

The best place to find cheap LED's is on eBay. You can get 100 from China for under $10, including shipping.
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DWiggy4 years ago
you should have it run through a fog chiller first so that the fog stays low to the ground, which makes for a very cool and creepy effect.
nice job though.
emotec3 years ago
This is just for all you folks looking for an easy and low cost solution to driving Led Projects!!

I found this driver board awhile back and for the cost , I'm giving it a try. I 'm building a lightshow system for my Granddaughter for Christmas and needed a no-programing- required interface to bring it all together.
What's nice about this device is that it is also programible via serial port and Hypertext terminal if later on she would like to gain direct
control of her lighting system, so I'm also includeing a
serial interface (RS 232) card and cable in the package with a programing lesson gift card (with myself as the instructor-lol).

These two items are availible at the same website for $ 12usd.
Oh, I almost forgot, this little gem of a driver is only $15 usd+shipping! Both the driver and the serial interface are fully assembiled
and ready to go.

To supply the lighting ,I also purchased a 5 meter 5050 smd rgb strip with 300 LEDs (or 60 Leds per meter )waterproof and fully addressable,
and three 3watt ultra high intensity rgby/w modules, (to be used as wall washers) which are also compatable with these devices and can be
chained to add as many more as you would like.

While I'm waiting for this stuff to arrive from China, I'm building housings for all the different effects tI have designed into this system
I'm reworking 2 ATX computer power supplys to give the system plenty
of power and they should remain very reliable for years to come.

Now for the good news! I'm making my first instructibale as I put this project together with lots of pictures and what I hope will be clearly explained narration.
I'm hoping to finish all the editing and tweeking on that and getting it
posted before the end of Feb. 2012. If I can borrow a good camcorder from one of my friends, I'll include a video or two
of the finished project in operation.

Hope the info about the hardware will help some of you solve your problems with building your Led projects.
What follows is a link to Sure-Electronics LLc in Nanjing China and tech specs for the driver.

Good Luck everyone and happy tinkering!!

Emotec In Texas


Audio Synchronized RGBW RGB LED Driver Demo Board

Brief Introduction:

DE-DD13111 is a LED driver with an audio synchronization mode that virtually
eliminates the need for real-time software processing for LED lighting effects,
especially for use with RGBY(W) LED lighting color displays (CD-001-xxx series) , but may also be used to drive LED arrays and LED strips of any length.
In audio applications,your PC, MP3 player, CD, DVD or cell phone can be used as the audio source. Connected to the driver ,which is
powered by DC12V, RGBY(W) LED lighting color displays
will dynamically display the variation of the incoming audio signal.

The audio input signal is filtered into four kinds of frequency: low, medium,
medium-high and high, with each range of frequency assigned to a specific PWM driver. Four PWM outputs respectively control one of red, green
blue and yellow LEDs. You can write commands via Hyper Terminal to
specify LED color to a corresponding frequency of your choice and adjust the gain of each frequency to change LED intensity. LED intensity can also be
controlled by duty cycle which is adjusted by the amplitude of the spectrum.
In addition, either of the two on board jacks can be used for audio signal input or output.

Definition of frequency:

Low-- 150HZ
Medium-- 600HZ
Medium-high-- 3KHZ
High-- 6KHZ


Supply Voltage Input Sensitivity Operating Temperature Humidity Range
Typ. 12vdc ±0.5vdc -10 to +60 degrees cel. 0-85% RH
Max. 13.7vdc +75 degrees cel.
Min. 11.5vdc -40 degrees cel.


1.Cell Phones
2.Portable MP3, CD, DVD, AAC players
3.PC, PDA's


1. Size: 78.00 (L) ×77.36 (W) ×18.70(H) ±0.2mm
2. Four PWM outputs control four color LEDs
3. Accesable via serial port and hypertext terminal to set the corresponding
relationship of colors and frequency.
4. Individual PWM gain setting can be configured 4 different ways.
5. Gain of each of four frequency bands: default 10, adjustable from 1 to 50
6. Default corresponding relationship of colors and frequency:
Y/W - low frequency
B - medium frequency
G - medium-high frequency
R - high frequency

Min. 11.5vdc -40 degrees cel.
audio driver.jpg
britebulb3 years ago
Very cool idea and great instructions.
JamesFXR6 years ago
where can i get cheap leds from china(what website)?
marc92 (author)  JamesFXR6 years ago
I bought mine from eBay. Many sellers there ship from China. Do you plan on trying this project?
JamesFXR marc926 years ago
possibly but right now i am looking for a cheap place to buy leds in bulk. would you mind telling me who the seller is on ebay?
besthongkong.com had the best prices on bulk LEDs when I last checked.
marc92 (author)  JamesFXR6 years ago
I'm not really sure on my seller, but just search for LED's on eBay and sort by price lowest first. That should provide a good list with plenty of options for size, number, and color.
JamesFXR marc926 years ago
what does mcd mean?
marc92 (author)  JamesFXR6 years ago
Millicandelas. It is the brightness unit used for LED's. The higher Mcd the better.
JamesFXR marc926 years ago
did you use 5mm leds
marc92 (author)  JamesFXR6 years ago
Yep, I've found that 5mm is the perfect size for most LED applications.
JamesFXR marc926 years ago
i dont know what mcd to get do you know what yours are?
marc92 (author)  JamesFXR6 years ago
It depends on how much money you want to spend, your application, and how bright you need/want them. Generally, the higher the Mcd, the brighter, and the more expensive.
JamesFXR marc926 years ago
is a 15000mcd Green LED Super Bright good?
marc92 (author)  JamesFXR6 years ago
JamesFXR marc926 years ago
i am kinda looking for a lower price what do you think the minimum mcd would be
marc92 (author)  JamesFXR6 years ago
It depends on your application. If you need brighter LED's then shell out a little more for the higher Mcd's. If you don't need brightness then 4000-5000 Mcd can work. But again, the higher the Mcd, the brighter.
Its often better to compare the power consumption of the leds (mw) as the mcd ratings are often grossly overstated
drake2s5 years ago
everyone should take a look at dealextreme.com it's based out of china very cheap prices.
john126926 years ago
ever think of putting this on a car?
Metorks6 years ago
This is a great mod. I plan to do this for next Halloween for sure. One idea is to integrate a fog chiller into the spreader so that the fog stays low to the ground. Right now I run a tube from my fog machine through a styrofoam cooler of dry ice. I suppose I could hook the spreader up to the other end of the cooler. Cheers!
peguiono6 years ago
dang lol I was going to do this... oh well nice job
marc92 (author)  peguiono6 years ago
Oh I was afraid of that. Lol. Could you post some pictures of yours?
peguiono marc926 years ago
whelp don't really think its worth the picture its just about the same except mine was going to go down the side of a walk way and the fog machine was gonna be connected to one end instead of the middle
srhadaham6 years ago
if only my fog machine hadn't died 1 week before Halloween (much crying inserted here). looks good
marc92 (author)  srhadaham6 years ago
I had that same problem. The pump on mine stopped working, but after much tinkering I got it working again.
Jakeg marc926 years ago
yeah my wikid nice 70 dollar fog machines pump broke right before haloween. I tried to get it working but it didn't work. How did you fix your pump?
frollard Jakeg6 years ago
its basically the same as an aquarium air pump by design (*in my old radio-shack one at least) I picked up some for 15-20 bucks at wal mart this year, but they didnt come with the timer controllers - those cost extra. I intend to keep a good stock of them for all occasions.
marc92 (author)  frollard6 years ago
I believe my fog machine uses a piston pump. Not as easy to replace, especially because the maker of my fog machine is no longer in business.
marc92 (author)  Jakeg6 years ago
My fog machine has a piston pump. I opened up the machine and found that the pump was the problem so basically I took it apart, cleaned it out, and put it bak together several times and luckily it worked. When doing this, make sure that you disassemble all parts of the pump. Try this a few times and if it still does not work then you might be out of luck. Or you can try to order a new pump.
Jakeg marc926 years ago
Ohh thank you soooooo much for that info. I didn't have a chance to fix my pump because it died the night before Halloween.Once again thank you!
marc92 (author)  Jakeg6 years ago
What a bummer, the night before Halloween, that stinks. I hope my advice works for you.
Jakeg marc926 years ago
I know I was soooo agravated so I just used dry ice. It didn't have the best effect though. uhhhh
marc92 (author)  Jakeg6 years ago
Oh, where did you get your dry ice? I couldn't find any this year.
Jakeg marc926 years ago
Well there is this guy in Warwick, RI called Art In Ice that does ice sculptures and sells dry ice! 10 pound block of dry ice for 11 bucks. Its not that bad.
marc92 (author)  Jakeg6 years ago
Cool! And it is not far from me.
Jakeg marc926 years ago
What town do you live in?
marc92 (author)  Jakeg6 years ago
I live near Foxborough, MA. I'm about 10 minutes form Gillette Stadium and about 45 minutes from Boston.
Jakeg marc926 years ago
Wow You are the only other New England Instructabler that I know! Awesome :)
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