Bulk LED Christmas Tree

Under the New Year, you want to decorate your house in an original way: in order not to be like your neighbors, and of course not like "last time". With the help of the LED strings offered on the market, you can create interesting compositions, but the price of the question negates the bold design decisions. Yes, and typical Chinese LED decorations look the same, and as a rule - faceless.

A reasonable solution is to create a garland with your own hands

  • Firstly - it will be 100% original product.
  • Secondly, the decoration configuration will be exactly as you need.
  • Thirdly, this is a real money saving.
  • Finally, you can safely say to family members, and especially children: “Daddy can!”
The greatest difficulty is the lighting of the New Year tree. Actually, there are only two options: wind the standard garland in a spiral, or try to arrange it vertically, in the form of a pyramid. Choose the second option, especiallythat the lines can be made of the required size: the height of the Christmas tree. The concept is as follows: from the top to the lower branches the wires are stretched, the LEDs are arranged with the same interval, as if creating tiers.
Bulk LED garland on the tree
The light must be dynamic: you will need a control controller. Simple LEDs shine beautifully, but the spot lights do not create volume. So we need ceiling lamps for each LED element. The calculation of the garland starts from the power supply. The option is purely individual: I used an unnecessary power supply from a laptop. Estimated number of LEDs - no more than 100 pieces, when using standard LED 5 mm, the total current consumption (20 mA * 100) is equal to 2 A at maximum brightness. For a serial connection of 6 diodes (the voltage drop on each is about 3 volts), the voltage of the power supply is 18-20 volts. General calculation of the power supply of the garland: We collect 5 lines. Each "thread" consists of 18 light-emitting diodes on 6 pieces. per channel (RGB variant). 18 * 5 = 90 pcs., Total current 1.8 A. Thus, the power supply unit for a laptop with parameters: 19 volts, 4 amperes, is suitable. This provides a double reserve for power.

Selection of the necessary materials:

1. Light-emitting diodes.I ordered forAliexpress: 3 packs of 100 piecesof red, green, and blue LED straw hat items, a scattering angle of 120 degrees. 2.Controller from Aliexpress. We will dwell on this element in more detail. If you do not want to spend time on making your own scheme (there are many options, the cheapest one is on the Arduino), you can take a ready controller for an RGB tape. All circuits operate on the same principle: 3 controlled channels, the turn-on sequence is set, and the brightness of the light. Actually, the three colors here are conditional, you can connect 3 channels of identical LEDs, and enjoy the light effects. To power the 19-volt channels, I chose a controller with a universal voltage of 12-24 volts. The control circuit is powered from any voltage in this range, at the output we get the power supply voltage: in my case 19 V. A prerequisite (for my circuit) is the presence of a remote control for operating modes. 3. Instead of a cable harness, I choseRGB cable(3 channels + 1 common). 4. Shrink tubes in different colors.
3D LED garland on the Christmas tree
For ease of installation, I used dupon type 4 pin connectors (2.54 mm pitch).The corresponding set has long been acquired from the same Chinese, an excellent help for various electronic crafts.
Bulk LED garland on the Christmas tree
As I planned to hide the LEDs in the ceiling lamps - a package of 100 pieces was bought on Aliexpress. snowflakes for garlands. Landing diameter is 5 mm.
Bulk LED garland on the Christmas tree

Calculation of wiring

The LEDs, even with a serial connection (in my case, 6 diodes), are connected through a current-canceling resistor. Parameters of LED elements on the package:
Bulk LED garland on the tree
The resistor is calculated by the formula, or on the LED calculator. I used the online service: http://cxem.net/calc/ledcalc.php
  • For the RED channel (voltage drop 1.8-2.0 V), the resistance is 420 Ohms.
  • For the GREEN and BLUE channels (voltage drop 3.0-3.2 V), the resistance is 82 Ohm (green) and 75 Ohm (blue). The green LED element shines brighter, so a resistor with a higher nominal value is used to equalize the overall picture.
The block diagram (along with the principle one) in the illustration:
Bulk LED garland on the tree
I bought a controller for RGB LEDs with a common anode.That is, a minus is fed to each channel, and a plus to the common wire.

Putting a garland

You can use twisted wires, like on factory garlands. I liked the construction on the train more.
Bulk LED garland on the Christmas tree
Making a reinforced leg for each LED element. To do this, you will need toothpicks and shrinking.
Bulk LED garland on the Christmas tree
Putting it together with a hair dryer.
Bulk LED garland on the Christmas tree
It turns out this design:
Bulk LED garland on the tree
It makes sense to immediately prepare and test all 90 LEDs.
Bulk LED garland on the Christmas tree
Then mark up the cable, determining the location of the diodes at an equal distance. I made neat cuts along the cable on the wires of the desired color, cut and tinned the installation sites.
Bulk LED garland on the tree
After assembling each LEDlooks like this:
Bulk LED garland on the Christmas tree
It turned out neat and reliable. Soldering is convenient on the fixture with a magnifying glass, which is called the "third hand".
Bulk LED garland on the tree
Next, connect the power wire (common "+") to the channels, through resistors.
>img src="https://sdelaysam-svoimirukami.ru/uploads/posts/2017-12/medium/1514521317_15.jpg" style="max-width: 100%;" alt="Bulk LED garland on the tree">
Isolate the details with shrinking.
Volumetric LED Christmas tree garland
And connect with the "plus."
Volumetric LED string on the Christmas tree
We are covering this loop with heat shrinkage of a large diameter. We install connectors at the opposite end. The result is 5 identical three-channel lines of 18 LEDs. Volumetric LED Christmas tree garland
We collect the connection node: 5 return connectors with the common control loop. Bulk LED garland on the Christmas tree The result is such a cable: on the one hand - 5 connectors for lines with LEDs,on the other hand, a connector for connection to the controller. When fixing the knot on the Christmas tree, I used a tightening clamp.
Bulk LED garland on the tree
Connect the lines, check all controller modes.
Bulk LED garland on the Christmas tree
Then we put snowflakes on the LEDs on the LEDs.
Bulk LED garland on the tree
Lesson is not easy (still 90 pieces!), but fascinating.
Bulk LED Christmas tree garland
Checking again. The effect is amazing.
Bulk LED garland on the Christmas tree
Note: LEDs work poorly in the photos, so the image is much worse than the original. It remains to mount the garland on the Christmas tree - and call the children: to admire dad's work.
Bulk LED garland on the tree
Total: The total financial costs of the garland - no more than 1000 rubles. The main consumable part is a ready controller. The power supply is conditionally free.Diodes and wires are mere pennies. Additional costs: 300 rubles for the ceiling-snowflakes. The option is not mandatory, but it significantly increases the attractiveness of the garland. The time spent (4 full weekends) is absolutely not a pity: it was interesting to work and the result was worth it.

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