Article

Programmable Christmas Tree

Brings (blue) light into the darkness

The dark days before Christmas are approaching rapidly. So it has become that time again that we as electronics engineers provide some more unusual mood lighting for the home. Naturally we will assist you again this year, in the form of a nice Christmas tree which conjures up all sorts of beautiful patterns on its 62 LEDs.

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Materials

www.eurocircuits.com/blog/171-PCB-PIXture-launched

www.elektor-magazine.com/140371

www.st.com/web/en/catalog/tools/FM147/CL1794/SC961/SS1533/PF257916

www.eurocircuits.com/x-mas

www.elektor.com/X-mas-tree

140371-11.zip

Component list

Component List
Resistors
R1–R16 = 82–100Ohm (SMD 0805)
R17–R24 = 100Ohm (SMD 0603)
R25–R28 = 10kOhm (SMD 0603)
Capacitors
C1,C2 = 10µF 6.3V tantalum (SMD A)
C3–C9 = 100nF 10V ceramic (SMD 0603)
Semiconductors
LED1–LED62 = LED blue (SMD 1206)
Q1–Q4 = FDV304P (SOT23)
IC1 = STM32F042C6 (LQFP48)
IC2 = W25Q80BVSNIG (SO8)
IC3 = LD1117S33TR (SOT223)
Miscellaneous
USB1 = micro USB connector, PCB mount (47346-0001)
SW1 = pushbutton, PCB mount (TACTB-64K-F)
PCB # 140371-1