How to Make Your Christmas Lights Flash to Music

How to Make Your Christmas Lights Flash to Music

from wikiHow - The How to Manual That You Can Edit

You've probably seen videos of Christmas lights that are synchronized to music. If you want your own lights to blink to the tune of your favorite song, here's how to do it.


  1. Decide how big you want it
  2. A channel is a unit of lights that can be controlled individually. For example, a single bush in your yard may be a channel. All the lights in a channel work as a unit (you can't flash an individual light bulb). 32 to 64 channels is a good size to start with.
  3. Stock up. The best time to buy lights is the day after Christmas. Many times you will find lights that were normally priced around $2 a strand fall to $0.50. Check out Wal-Mart, Target, Lowes, Home Depot, K-Mart, etc.
  4. Obtain a control system. You will need hardware that hooks up to your computer. You can buy a system completely built, a kit, or a full do-it-yourself system. More information is available through the External Links below.
    • A fully built system will work right out of the box. It will cost you about $20 - $25 per channel. It can be purchased from online vendors. Choose this option if you do not want to do any electric work (especially soldering.)
    • A kit will cost from $15 or so per channel. It's pretty much the same thing as in their fully built product without the enclosure. Because it is very simple to place an electronics board in an enclosure, this may be a great option to save you money. Some vendors sell everything you need to build a control system, including the bare circuit board and the parts. If you are willing to solder a little bit, check this out.
    • A do-it-yourself system has a very low cost of $5 per channel on up. The price depends on how much you actually do yourself. A system consists of a controller, which communicates with your computer, and solid state relays (SSRs), which actually switch the lights. SSRs can be bought or made yourself. With a do-it-yourself option, you will spend lots of time making your hardware, but the cost savings can make up for it. You also have total customization of your hardware, and will be able to fix problems easily.
  5. Get help. This can be a very big and complicated project, and often can seem overwhelming if you're just getting started. You can sign up for the forums at the sites listed below.
  6. Get software. If you buy commercial products, they have software available for purchase. There is also free software available for Do-It-Yourself systems (see the links section). If you're ambitious, you may wish to hand-code a program in almost any major programming language (usually not for pre-built products, as most of their protocols are closed-source).
  7. Design your display. Design the actual outside portion of your display. Common elements to include are:
    • Mini lights or net lights on landscaping
    • Icicle lights or c-series lights on roof
    • Mini Trees These are 2 to 3 foot tall trees, often made of tomato cages wrapped in lights of one or multiple colors. They are arranged in a line or a triangle and are very useful in an animated display.
    • Mega Trees This usually consists of a large pole with lights extending from the top to a large ring around the base. Again, it is very useful in animation.
    • Wireframes Metal frames with lights attached.
    • Blowmolds Plastic lighted sculptures.
    • C9 Lights on yard perimeter
    • Deer, trees, etc. purchased from store
  8. Program your show. Here comes the time consuming part! Decide on music that you will synchronize to, then start programming on your time grid. Don't do everything at once. This will probably take a couple of months to several, depending on how long your show is and how many channels you have. How to do this varies by the software program you choose.
  9. Let them hear you. Use a way that will create a spectacular sound yet keep everybody at peace. Speakers playing the same music over and over again would drive the neighbors crazy, so in most cases you will need to broadcast over an FM frequency. Please see the warnings section at the bottom of this page.
  10. Get powered up. Make sure your home has enough outside power to run your lights. A typical mini light strand draws about 1/3 amp. Speaking of power, computerizing your display will have a lower electric bill than a static display. This is because not all the lights are on at once. Please see the warnings section at the end.
  11. Publicize. Put a sign in your yard. Make a web site. List on a display listing site like the Tacky Light Tour. Tell your friends. Doing all this work will not be worth it if no one comes to see your display. Don't go to extremes, but make sure people know about you.
  12. Set up.
  13. Maintain your display. Go outside every morning and check your display. Repair or replace broken lights or damage caused by weather or vandals. Make sure things are ready to run the next night.


  • Talk to neighbors, police and your homeowners association about possible issues with traffic flow, noise, etc. It is much easier to prevent problems than to correct them. However, make sure they understand that there might be problems, not that there will be problems. People need to know what to expect, but don't stress things so that they shut you down before you even start up your display!
  • Use your time wisely. This is a big project, so don't be afraid to get help or try to do things more efficiently.Try to take your time for checking your lights and making sure there are no fire hazards!
  • Signing up for the forums at Christmas lighting sites is a good idea. You will get help from others and help others.
  • FPGAs make fantastic custom control devices, which can hook between an RS232 connection on a PC and a relay board for the lights. An entry level Spartan 3e Xilinx demo board is around $150.
  • Get people who know their electronics to help out, maybe someone in your neighborhood is a pro at this. Who knows?


  • FM Transmitters may or may not comply with FCC rules. The transmitters will broadcast at a very low power, so they should not cause any interference. The FCC allows you 200 feet from the transmitter without a license.
  • Do not do anything to the Belkin other than extend the antenna. Building an amplifier is not recommended. If the transmitter causes anyone to have interference, your only choice is to shut it down. More information on the FCC rules can be found here.
  • When you are dealing with lights you are dealing with high-voltage. United States line voltage (115 volts AC), in the right place and amount, can kill you. Always use a GFCI on any circuit that is outside, including your lights, for your safety and the public's.
  • Use a control system appropriate for your locale. Many countries use voltages higher than in the U.S., sometimes with different power line frequencies. Some places may even need lights with voltage-reducing transformers. Check with the manufacturer of your product, or the designs you followed, to see if your control system is acceptable for your locale.
  • This is time consuming. Start at least 6 months in advance, more for DIY systems.
  • Be considerate. Your neighbors may not appreciate you flashing lights or loud music at night, it is therefore recommended that you turn them off at some point during the night.

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