Christmas comes, and nothing more typical than riding a Christmas tree to give a bit of atmosphere. They come in many types, but this is intended for the most geeks, based on state of de art RGB LEDs and thought to 'planting' directly on an Arduino.
The scheme can not be more simple: an Arduino, 20 addressable LEDs WS2812b, few 100nF and a piezoelectric buzzer.
The WS2812b are cascaded through a single wire, so that communication with Arduino is extremely simple, only one pin, the data are passed from one circuit to the next, and this enables each LED can be controlled independently. This creates strips or arrays of RGB LEDs easier than ever.
The WS2812b think without exaggeration that is a real gem. Internally includes three LEDs (R, G, B) and an integrated circuit WS2811, which is responsible for handling the data put a single pin, and send the next control each led with 256 levels of intensity.
Here you have a couple of photos I could do the above:
Warning! There is another version of the WS2812 equal to 6 pin WS2812b but in the power of the LEDs and the circuit are separate.Given the boom have had, it is easy to find on ebay in adhesive strips where only the input pin and the supply must be connected or loose as in this case.
For operation of the LEDs, I use a great library: Adafruit neopixel, can easily handle this type of LEDs.
The code
As I already mentioned, I use the Adafruit library to control the LEDs. Basically is the example 'strandtest' of the library, to which I added a first half in which the tune of 'Jingle Bells' is played using the tone function, and some more effect.
In case you do not want to constantly hear the melody, you need to make a bridge between pins 2 and 7 to ring.
In case you do not want to constantly hear the melody, you need to make a bridge between pins 2 and 7 to ring.
This is the PCB design I've done:
Although theoretically requires a bypass capacitor of 100 nF for each LED, I've put a few scattered around the circuit (if any LED gets lost in a given time and not think it will be very serious), so far I have not seen no failure.
The code
You can download the code, the PCB and the schematic here:
Project Photos HERE
Merry Christmas!
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Well done. PCB-tree : what a great idea.
ReplyDeleteWere the capcitors necessary or did you just put them by safety ?
@BarbudorAccording to the documentation, this makes sure there's steady current available to the LED control logic amidst the small surges and dips that can occur as the LED brightness changes.
ReplyDeleteIn minor projects like this, do not need them all, but in a major project may not work properly if the capacitors are not, especially if the number of LEDs is high.
beautiful project! congratulations for your work! and thanks for sharing the source code
ReplyDeleteWhat is the program that you use to design PBC???
ReplyDelete@phill chanapai
ReplyDeleteBecause the shape was a bit 'special', I used Adobe Illustrator, not a program for PCB