Depending on where you lot live, you've likely seen a house with crazy flashing Christmas lights that change color and dance to music. Almost every neighborhood or boondocks has "that i house" that goes all out for the holidays each year. In my neighborhood, that business firm is mine. If yous've e'er wondered how those displays work and what you demand to make your own, this will be a short overview of all the components and how everything works together.

At that place are iii cardinal things that make up a Christmas calorie-free prove: the lights, the control circuitry, and the sequencing.

The lights are arranged together to form different props like leaping arches, snowflakes, stars, megatrees, and more. You couple those lights with controllers and power supplies to make them work as expected. There is specialized calculator software that tells the controllers when to turn on and off the lights co-ordinate to the music being played. These components are at the heart of every calorie-free testify and I'll go into particular about each one. While y'all won't be able to go to Walmart and pick this stuff upwardly, there are many companies and a large, helpful community eager to help.

Nearly 5000 individual pixels sequenced in XLights with the show running through Falcon Pi Role player on a Raspberry Pi.

The Lights

The most common type of lights you see at Christmas are traditional incandescent bulbs or more recently, LEDs. These strings plough on with 120V (in the United states) when you lot plug them into the wall and stay lit until you lot unplug them. Those are regular Christmas lights. Around 10-15 years ago though, people started connecting them to electronic switches chosen relays which allow the lights to be turned on and off with a simple microcontroller. This is essentially the same engineering plant in today's smart wall plugs, but with a more festive arroyo.

A typical holiday light brandish using this applied science might have had a few dozen of such relays controlling an equal number of calorie-free strands. This technology was fine for a few years, but somewhen things started to get more than elaborate.

The next big jump in engineering science came around v years ago and has transformed holiday lighting ever since.

Turning on and off a single strand of lights was boring and people wanted more colors, more effulgence, and fancier effects. LEDs had become very popular and and a new blazon of light technology started to striking the market called "Pixels". These pixels are essentially an entire strand of modern "smart" RGB calorie-free bulbs. Each pixel has a tiny microchip that tells the LED when to turn on and off and what color to light upwardly. They are connected in a strand and can each light up individually to form complex patterns and furnishings.

There are many types of pixels and many unlike protocols for communicating with them. The most common blazon of pixels utilize a protocol called WS2811. Essentially, the pixels in a strand receive data sequentially, decode the data intended for them, and pass through the information for all of the subsequent pixels down the line. The actual information that is transmitted consists of a crimson, greenish, and blue intensity value for each bulb.

These type of lights and their protocols were originally designed for digital signage and for theatrical productions. The same WS2811 protocol is used in mod individually addressable PC RGB lighting strips that you might have in your gaming rig. The only deviation is that holiday lights take a waterproof coating, are bachelor in strings upward of roughly 10-15ft, and toll considerably less.

These lights are so arranged in props which is where the artistry comes into place. Different shapes can be created using corrugated plastic, pipe, and custom structures to create almost any design imaginable. While the lights are standardized, the props are unique and involve considerable design effort to figure out where to place the pixels. They must too exist able to withstand an entire winter season outdoors without falling apart.

Designing the Show

Designing a evidence is a lot similar composing for an orchestra. The lights are bundled in props like trees, arches, stars, snowflakes, and more. Different props tin be grouped like instruments in an orchestra as they calorie-free up with the music. Choreographing the unlike elements to music requires special software that knows how to interface with the lighting protocol.

The most mutual program is xLights which is free and open up-source. Shows are designed sequentially along a timeline where each bear witness element has a unlike rails. At that place are many different effects that tin exist applied to private elements or to groups. Each evidence is unique and the different effects can be incessantly customized.

The software creates a grid of where the lights are located using a reference photo of the venue. From here, complex patterns tin be practical to the grid to create the effects. Some furnishings might but calorie-free upwardly a single strand while others might move across the entire firm.

Once the evidence design is finished, the file is exported to a format that includes the color data for each of the lights. A typical bear witness will too take a refresh rate between 20Hz and 40Hz, which ways the output file contains the condition of every bulb for every frame during the testify.

Controllers and Ability

All those lights are nifty, but they need controllers and power supplies. A typical show that you may run into volition have two types of controllers: the start is a evidence computer that stores the file from the sequencing software and transmits it to all of the elements. The second type of hardware used to run the evidence are the controllers that interface directly with the lights. These controllers come in many different shapes and sizes but all exercise essentially the same matter. They convert the data from the bear witness calculator into the WS2811 protocol which directly drives the lights.

The controllers receive data from the testify computer using a protocol chosen E1.31. This protocol is a manner to stream lighting data over a traditional IP based network. The pixels are grouped into "universes" of 170 lights which all go routed to the same controller. Each light needs to have a ruby-red, dark-green, and blue intensity value to determine what color it should exist. If y'all are familiar with DMX for theatrical productions, it's the same idea.

Each controller has an IP accost and knows what configuration of lights are connected to its output. When it receives a information parcel from the testify computer, information technology makes certain information technology is addressed to the right universe, decodes the WS2811 data that is in the parcel, and outputs the data stream to the pixels.

In terms of controllers, in that location are ii primary styles that people volition utilise in a light bear witness. The first is a centralized, very powerful controller with lots of outputs. The second is numerous smaller controllers positioned closer to the elements. Both have their benefits and while centralized controllers are the most popular style now, the smaller decentralized controller style is gaining in popularity.

The controller I have here is a professional-grade board made by Advatek Lighting. This device can control up to 32 private pixel strings outputs for a total of just over 16,000 pixels. Thanks to its beefy power connectors, it can also supply hundreds of Watts to keep the pixels bright. Rather than using Wi-Fi, which can get crowded if you lot have lots of devices, this controller has a defended Ethernet connection. If you are serious about vacation lighting, this is the type of controller you want. Information technology is also powerful plenty to be used in commercial displays similar at a theme park.

Taking a tour around this board (photo above), we starting time with the main power connectors on the left side which ability the lights. Pixels use either 5V or 12V, and then a standard high-wattage computer power supply tin be used or power supplies specifically designed for LED lights. This board can handle both voltages at the same fourth dimension. Effectually the tiptop and bottom nosotros have xvi removable plugs for the pixel connectors to plug into.

Nearly of the common pixel types, like WS2811, use three wires: power, ground, and data. However, some other pixel types accept a clock pin every bit well. At the center of all of this is a microprocessor that handles the connectivity and bespeak required to interface with the pixels. At that place are as well four commuter ICs that boost the betoken-level output from the processor to one suitable for driving pixels a long distance from the controller. Finally, on the right hand side, nosotros have external connectivity. This includes legacy DMX outputs equally well equally Etherne. In that location are many other controllers from companies like Falcon and HolidayCoro but they all have a similar format.

Running the Show

In one case you have all the required components and everything is put together, running the show is fairly simple. On the controller side, you just need to tell it what configuration of pixels are fastened to what output port. You can also adjust things like brightness and pixel ordering. Each controller volition have its own configuration either via a spider web interface or through a defended programme.

The terminal affair you'll need is a reckoner to store the sequences and audio data for the show. You lot tin use a laptop, but one of the most common types of bear witness computers due to its cost and accessibility is a Raspberry Pi with the Falcon Pi Role player software.

Every dark during the prove, it loads the sequences nosotros programmed before, plays the sound associated with information technology, and sends the lighting data out to the controllers in the display. This computer too needs to know almost the specific controller setup, then that it can send data to the correct accost. The audio output is normally fed into a portable FM radio transmitter, so that people in their cars can hear the show.

To recap, the lighting effects are first created in software, so that software is exported into a show file which contains the color data for each pixel at every moment of the evidence. The evidence file is played from a show computer which outputs the light data using the E1.31 protocol to controllers. The controllers receive packets addressed to them and finally output the resulting WS2811 data to the pixels.

There's a lot of engineering science behind the scenes to create these displays and information technology still has lots of room to ameliorate. Pixels are becoming more attainable and like shooting fish in a barrel to setup. Controllers are getting more powerful but at the same time, more user-friendly.

Interested in setting up a brandish of your own?

It's certainly likewise tardily this year to put one up, but there are plenty of resources to teach you everything you demand to know. There's a smashing YouTube series that can teach you the basics to become y'all started. Depending on how much effort you desire to put into the display and how good you are with a soldering atomic number 26, you can either brand your ain show elements or purchase some ready-to-run.

The displays can be a fleck expensive getting started, but the price is dropping yr after yr. For example, a strand or strip of 50 pixels will cost around $ten from China and a good controller will cost effectually $200. Besides that, basic tools like PVC pipe, metal conduit, cipher ties, and hook-up wire aren't very expensive.

I've been doing light shows for a few years at present, the video at the peak of the article is my 2022 evidence if you lot'd like to see what the final production looks like. Happy holidays everyone!