diff --git a/pcb/README.md b/pcb/README.md
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--- a/pcb/README.md
+++ b/pcb/README.md
@@ -11,7 +11,26 @@
 
 ## 当前项目
 
-（待补充——环路检测板 / 道闸控制板方案落地后按项目建子目录）
+### loop-detector（环路车检器）— 2026-08-21 唐磊产出
+
+KiCad 7.0.11 工程，A3 单页原理图，完整信号链：
+**线圈端子 → TVS 浪涌保护 → 匹配变压器 → 考毕兹振荡 → 比较器整形 → MCU 测频 → 光耦隔离 → 继电器输出**
+
+目录结构：
+```
+pcb/loop-detector/
+├── loop-detector-kicad/     ← KiCad 工程
+│   ├── loop-detector.kicad_sch   ← 原理图
+│   ├── loop-detector.kicad_pro   ← 工程文件
+│   ├── loopdet.kicad_sym         ← 自定义符号库（12 符号）
+│   ├── loop-detector.pdf         ← 导出 PDF
+│   ├── loop-detector-preview.png ← 预览图
+│   └── gen_sch.py                ← 程序化生成脚本
+├── loop-detector-principle.html  ← 原理图网页版（交互）
+├── fig1-methods.svg/png          ← 检测方法对比图
+├── fig2-schematic.svg/png        ← 系统框图
+└── inline_svg.py                 ← SVG 内联化工具
+```
 
 ---
 
diff --git a/loop-detector/fig1-methods.png b/pcb/loop-detector/fig1-methods.png
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diff --git a/loop-detector/fig1-methods.svg b/pcb/loop-detector/fig1-methods.svg
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diff --git a/loop-detector/fig2-schematic.png b/pcb/loop-detector/fig2-schematic.png
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diff --git a/loop-detector/inline_svg.py b/pcb/loop-detector/inline_svg.py
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diff --git a/loop-detector/loop-detector-kicad/gen_sch.py b/pcb/loop-detector/loop-detector-kicad/gen_sch.py
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diff --git a/loop-detector/loop-detector-kicad/loop-detector.kicad_pro b/pcb/loop-detector/loop-detector-kicad/loop-detector.kicad_pro
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diff --git a/loop-detector/loop-detector-kicad/loop-detector.kicad_sch b/pcb/loop-detector/loop-detector-kicad/loop-detector.kicad_sch
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diff --git a/loop-detector/loop-detector-kicad/loop-detector.pdf b/pcb/loop-detector/loop-detector-kicad/loop-detector.pdf
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diff --git a/loop-detector/loop-detector-kicad/loopdet.kicad_sym b/pcb/loop-detector/loop-detector-kicad/loopdet.kicad_sym
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diff --git a/loop-detector/loop-detector-kicad/sym-lib-table b/pcb/loop-detector/loop-detector-kicad/sym-lib-table
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diff --git a/loop-detector/loop-detector-principle.html b/pcb/loop-detector/loop-detector-principle.html
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