I started these lights back in May … 2016 !!! Oh well, better late than never.
A small micro controller (PIC12F1840) drives a WS2801 LED chip which in turn drives the RGB LEDs.
In some ways this was easier than having the micro PWM the LEDs directly via transistors.
A centre cutout allows for the cable gland and power wires to the board.
The PCB was spray lacquered after programming and testing.
It was an interesting exercise positioning the 3 LEDs around the
circumference and drawing the curved tracks to connect them.
Sorry for the blurred photo.
It’s strong enough to hang the assembly from.
I cut them at 750mm, but in hindsight could have left them longer.
That would have allowed for easier positioning in the trees.
It was secures with 2 screws through the side of the cap.
The current draw is about 60mA @ 12V per tube.
8 T piece cables were used to connect them together.
12V power is fed to the tree via a flying cable.
I may change that to 30V and fit a small DC converter in the tree.