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FaSTGLETree
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Simple christmas tree from 2 PCBs with pseudo-random blinkenlights. Soldering workshop subject.
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README.md

FaSTGLETree

Simple christmas tree from 2 PCBs with pseudo-random blinkenlights. Soldering workshop subject.

3D CAD rendering of an electronics-based christmas tree made from 2 PCBs slotted into each other to give it 3-dimensionality. There's a 3D printed star on top.

Features / Function

  • CR2023 coin cell for power
  • 1-pos SMD dip switch for on/off
  • button for manual shifting
  • 3 pin header with jumper for switching between timer and button for shifting
  • All ICs are low voltage (down to 2V / 2.5V) variants
    • 555 Timer set at ~.5Hz
    • SIPO 8 bit shift register for patterns
    • Pattern scrambling with 2x4 NAND gates
    • Feedback from 2 NANDs into shift register
  • 16 SMD LEDs connected to shift register and NAND outputs
  • 1 yellow THT LED always-on on top
    • Transparently 3D-printable star cap

Cost

~10€ BOM @ 30pcs

Licensing

Licensed under CERN OHL, see LICENSE.txt