Technological Christmas decoration made with 56 LED Neopixel and controllable with any Arduino board (not included), suitable to be placed on top of the tree or where you want, for example on the front door.
The Neopixel LEDs are connected in cascade and fed in parallel; This configuration allows you to address each and every LED individually and choose the color among the 256 possible combinations for each basic color RGB (so we have 256x256x256 combinations!) resulting in a total of 16,777,216 colors. The sketch that we have written and which you can download at the bottom of the page, allows you to create different effects as soon as power is applied.
Power supply: 5 V DC
Dimensions (mm): 148x148

The Neopixel technology allows to produce RGB LED "intelligent" with onboard controller can be easily integrated into the environment thanks to Arduino libraries that Adafruit (www.adafruit.com) makes freely available. A peculiarity of Neopixel LEDs is that they can be connected in cascade so that the data line from one to the next steps, but the price to pay is that beyond a certain number of LEDs, the management of the speed must be reduced significantly; because of that, if you must create matrices to show the fastest graphics it is necessary to use several lines with a few LEDs each. Each RGB LED can be controlled individually via a dedicated command inserted into the serial data stream and can produce up to 256 shades of their color, resulting in a total of 16,777,216 color combinations. Neopixel is basically a solution that provides for the integration of a driver and the corresponding LED RGB in a SMD homes, allowing for direct LED control to LED. The data channel used for communication with the LEDs neopixel and then with the strip is similar to the One-Wire type. The supply provided for Neopixel LED is at 5 volts; communication takes place in a maximum of 800 kbps. The system of Neopixel command protocol involves sending groups of three bytes in a 24-bit string, each of which contains the state of illumination of each base color (first eight bits of green, then those of the red and finally those green).

• Sketch
• Post on openblog