Smart Pixel Strip Turned On

Intro to Smart Pixels – Part 1

Want some cool Christmas lights? Tired of the normal lights your parents grew up on? When I began my journey into Christmas light shows (aka smart lights that twinkle to any pattern), I too knew absolutely nothing about the terms, the technology or what to look for.¬† Even though I have an electrical engineering background and years in technical marketing, don’t assume things come naturally. With a little persistence and a lot of Google, YouTube, public forms and wiki pages, anything can be learned. So this post is part 1 of my journey into controlled light shows and can be yours too. For starters I found it very useful to learn the industry terms, and the concept of which parts are needed. Thus I begin my blog post as a intro to smart pixels and how to get started.

PS. I’m not sponsored, everything you read is my personal opinion about the industry ūüôā¬†

My Initial House Show (testing for Halloween):

 

Related Tutorials:

 

First off is understanding some of the lingo. So when you hear “oh i’m using a Falcon controller running on E1.31 protocol and i’ve got 400 smart pixels running on 3 universes under my eaves” that something will make logical sense. Also I’ll cover a basic setup, this picture shows my basic house setup, this is the basics, and it only gets more complicated from there.

Christmas Light with Smart Pixels Layout example - Brian Hensley

Smart Pixels / Dumb Pixels

The first and most important term to understand is Smart Pixels. Basically they are string of RGB LED lights that can be changed to any color, anytime, in any order. Compared to Dumb pixels which are RGB LED lights where the whole strand has to be the same color at the same time. Its that simple, either each light can be anything anytime, or the whole strand has to be the same colors. There are many Youtube examples to determine which kind of lights you want on your house, so if you need help I’ve provided a few examples on the bottom of this page. Generally the desired house look will determine the type of lights to buy, type of controller to buy, etc.

WS2811 are an example of a popular type of smart pixels technology, there are many others, but this is the most popular. They can be any color, anytime. They come in 12 Volt and 5 Volt standard connections and depending if you want to be water and dust proof you need to make sure they’re listed as IP67 or IP68 rated. Typically IP68 is a higher water proofing meaning it can last longer submerged in water. But either will do the job (I live in Beaverton Oregon, it rains a lot here and i’m using IP67).

Basically the make up is simple, there is an Integrated Circuit (IC) chip that is in each pixel, it receives data from the controller telling it what color to be and what intensity. Each LED is actually 3 individual diodes each controlling one of the primary colors, there can be up to 3 sets of LEDs (each with RGB) for a total of 9 LEDs.

WS2811 Schematic Picture

Pixels come in a variety of form factors, which in the end is just a personal preference depending on how you want to mount them to your house or props. It really doesn’t matter if you use Bullet, Square, Strip, or Module.

 

(Bullet Pixel)

Bullet Pixel RGBBullet Pixel RGB turned on

 

(Square Pixel)

Square Type Pixel RGBSquare Type Pixel RGB turned on

 

(Strip Pixel)

Smart Pixel RGB StripSmart Pixel Strip Turned On

 

(Module Pixel)

Smart Pixel RGB module turned offSmart Pixel RGB module

 

Where to buy???

I recommend Ray Wu’s Store

I recommend Holiday Coro

 

RGB

RGB is short form for Red Green Blue, these are the primary colors that all others can be created from. Basically a IC will control a bunch of LEDs each with red, green and blue light emitting diodes. You can then program each pixel to be any color! Pretty cool huh?!?

RGB colors

 

Universes

So a typical pixel = (one IC + RGB LED) is also called 3 channels (referring to DMX light channels), basically its one channel per primary color per pixel. Its easy to just remember 1 smart pixel = 3 channels. Confusing I know, but keep following. According to the DMX standard for lighting there can be up to 512 channels in whats called a Universe. A Universe is basically a way of describing a large set of pixels, think of it as “oh I have 22 Universes, instead of saying I have¬†11,220 channels”. Now 3 doesn’t divide into 512, so most people will just use 510 channels in a Universe. Meaning a Universe = (~510 channels) = 170 pixels. That’s the important part, one universe equals 170 smart pixels.

“Universe = (~510 channels) = 170 pixels”

The electronic controllers have up to 16+ output ports to drive the smart pixels, and each output can drive multiple universes. The problem you run into is current limits and voltage drop. For instance the Falcon Controllers can handle up to 5 Amps of current per output, but that could be eaten up with lets say 150 pixels (its better if you learn what your pixels current draw is and calculate the number of pixels you can handle), so if you want a controller output port to handle more than one Universe you’ll need to learn about Power Injection.

 

Power Injection

I could explain this, but I find the Holiday Coro blog to explain it perfectly. Personally i’m using 12V pixels.

“This is why you see 12v pixels vs. 5v pixels.¬†¬†A 5v pixel is closer to the actual voltage of the LED and IC chip using the power and thus is more efficient as where 12v has to be ‚Äúdropped‚ÄĚ down by use of a voltage regulator circuit (not as common) or dropping resistors which waste the power.¬†¬†The trade off is that you generally can run 12v strings of pixels, given the same gauge wire, longer distances than you can 5v pixels without the need to re-inject power as often.¬† This is an entirely¬†separate¬†and complex¬†discussion. ¬†In general, you’ll find it “easier” to work with 12v RGB lighting which is more forgiving than 5v lighting which requires more accurate planning and power management.” – Holiday Coro Blog (blog link)

 

Controllers

Simply put, a controller is what drives your pixels. Its the electronic hardware that receives data from a ‘brain’ and does the power management and timing for lights. There are many many different types all dependent on budget, performance, complexity, etc. The best website to compare specifications to help make an educated decision on smart pixel controllers is this link >>¬†http://nutcracker123.com/nutcracker/rgb_controllers/

Falcon F16v3 Controller - Free to reuse pic

My Falcon F16v3 controller! ($200)

 

When picking a controller its easy to get lost in the specs. But here are a few things that matter (in my opinion):

  1. Future proof yourself (If this is your first year, I find it worth the extra $80 to buy 12 more ports on the Falcon)
  2. Each Falcon port can handle up to 1024 channels (~340 pixels – with power injection)
  3. DMX / expansion ports / daisy chaining controllers – allows for future proofing or to run a 100+ foot extension to another section of your house
  4. Webpage setup – this is really nice, you can connect to the board remotely by IP to configure it. (check out my other blog post)
  5. Make sure you have an active community for resources. I found the Falcon Community and others are great!

 

If you’re starting your first light show check out these popular controllers:

 

Xlights

There are many free pieces of software to get started in creating your light show. I personally have only tried Xlights, its free, open source and has a very active community. If you’re interested in learning a lot more about Xlights then you should really Youtube some tutorials. (i’ll update this section if I find time to create some simple tutorials)

 

Hope this all was useful! please feel free to email me or comment below.

 

 

This all can be useful for a variety of controllers: Sandevices E682, Falcon F16v3, F16v2, F16v2r, F4v3, F4v2, Avantek PixLite 16, Pixcon 16 and more.

 

Referenced Websites and Videos:

http://blog.holidaycoro.com/2013/04/outlining-your-house-in-rgb-lights.html

http://www.doityourselfchristmas.com/wiki/index.php?title=Electronics_Hardware

 

Xlights tutorial 

What is a Mega Tree?

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