与衰落的RGB LED的印刷电路板

A printed circuit board (PCB) is made into the shape of a christmas tree. On one side of the PCB, some LEDs are placed, which will gradually change color when power is applied to the circuit. 5V Power must be applied to the USB-mini connector. Project Inspiration ](http://christmastree.googlecode.com/files/vector-christmas-tree-digital-circuit.jpg) The main reason for starting this project was to find an original christmas card. Requirement specification Must be small enough to fit a standard envelope. Must be powered from an easy to get power source Preferably environmentally friendly Power consumption must be lower than 0.5W. Device must be able to survive in a tropical climate. Device must be in the shape of a christmas tree. There must be lights on that christmas