Necessary tools:

• Arduino (or any other device capable of programming an ATmega328)

• soldering iron (preferably with temperature control)

• fine solder (not bigger than 0.5mm in diameter)

• flux pen

• multimeter

• fine tweezers

• pliers

• sandpaper

Optional (but handy) tools:

• Scotch tape

• fume extractor

• anti-static mat

Components for the tree:

• Custom design tree-shaped PCB; see further steps

• ATmega328P-AU

• 1× TI TPS-61070 DC/DC booster IC

• 12× dual color SMD side LED (KPBA-3010SURKCGKC)

• pin headers:

• 2 1×9 female

• 2 1×9 right-angled male

• DIP switch (DS-01)

• 4× AAA battery clips

• 3× P-type MOSFET SOT23 package (IRLML9303TRPBF)

• 0805 smd resistors:

• 4× 68 Ω (for red LEDs)

• 4× 62 Ω (for green LEDs)

• 2× 10 kΩ

• 1× 180 kΩ

• 1× 1 MΩ

• 0805 smd capacitors:

• 2× 0.1μF

• 2× 4.7 μF

• 1× 10 μF

• smd inductor:

• 1× 4.7 μH (L-USWE-TPC)

More about this project: http://www.instructables.com/id/PCB-Christms-Tree/