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FaSTGLETree
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Oskar Winkels 2023-01-09 02:41:40 +01:00
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# FaSTGLETree
Simple christmas tree from 2 PCBs with pseudo-random blinkenlights. Soldering workshop subject.
# 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