27 lines
738 B
Markdown
27 lines
738 B
Markdown
# FaSTGLETree
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Simple christmas tree from 2 PCBs with pseudo-random blinkenlights. Soldering workshop subject.
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# Features / Function
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- CR2023 coin cell for power
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- 1-pos SMD dip switch for on/off
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- button for manual shifting
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- 3 pin header with jumper for switching between timer and button for shifting
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- All ICs are low voltage (down to 2V / 2.5V) variants
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- 555 Timer set at ~.5Hz
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- SIPO 8 bit shift register for patterns
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- Pattern scrambling with 2x4 NAND gates
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- Feedback from 2 NANDs into shift register
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- 16 SMD LEDs connected to shift register and NAND outputs
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- 1 yellow THT LED always-on on top
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- Transparently 3D-printable star cap
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# Cost
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~10€ BOM @ 30pcs
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# Licensing
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Licensed under CERN OHL, see LICENSE.txt
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