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Schematic includes: - Power section: SS14 reverse protection, AMS1117-3.3 LDO - RP2040-Zero and OLED module headers - Trigger output: 74LVC1G17 Schmitt buffer - Return input: voltage divider, BAT54 clamps, MCP6001 buffer - Button with pull-up, power LED BOM updated with correct parts and LCSC numbers. ASCII schematic reference in hardware/kicad/README.md.