Last year we have built an interactive Christmas tree for the entrance hall of Czech Technical University in Prague at Karlovo namesti, this year we were asked by journalists from a technological on-line magazine Technet to put our tree on board of the service tram, so that even wider audience would enjoy it. This tram lubricates the rails all around Prague to minimize noise and is equipped with a camera streaming live video on the Internet. The installation was done in cooperation with Prague Public Transit Co. and Czech Slow TV. You can see the video stream and control the tree here
The Christmas tree is decorated by a string of individually addressable RGB LEDs (WS2811) controlled by Raspberry PI 2. Blinking of the lights is far from random, it is governed by a numerical model of wave equation simulating propagation of waves along the string. Everybody can influence this virtual environment by their own wave sent over a web interface. These waves interfere and create momentary colorful images born in interaction of all connected users.
Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.