diff --git a/loop-detector/fig1-methods.png b/loop-detector/fig1-methods.png
new file mode 100644
index 0000000..31edc96
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diff --git a/loop-detector/fig1-methods.svg b/loop-detector/fig1-methods.svg
new file mode 100644
index 0000000..5711dcd
--- /dev/null
+++ b/loop-detector/fig1-methods.svg
@@ -0,0 +1,87 @@
+
+
+
+
+
+
+
+ 环路车检器 · 检测方法对比与选型推荐
+ 选型核心：灵敏度（能否测摩托/自行车）× 抗干扰（变频器/电力谐波）× 成本。结论先行：主推 ①LC振荡+频率计数；复杂电磁环境上 ④；高灵敏需求上 ②。
+
+
+
+
+
+ ① LC振荡 + 频率计数 ★★★★★
+ 原理
+ 车辆进入 → 线圈等效电感↓ →
+ 振荡频率↑ → MCU 定时器测频/测周期
+ 灵敏度
+ ★★★☆ 轿车/SUV 稳定；调阈值可测摩托
+ 抗干扰
+ ★★★ 配自适应阈值 + 频偏跟踪
+ 成本
+ 低（MCU + 三极管/比较器即可）
+ 适用
+ 主流道闸/停车场/流量计数，市场 90%
+ 要点
+ 周期法优于计数法：低速/停留不丢车
+ 回差阈值防抖动；基准慢速自适应抗温漂
+ ✅ 推荐主方案：成熟、稳定、成本最优
+
+
+
+ ② PLL 锁相 / 相位比较 ★★★★
+ 原理
+ PLL 锁定振荡信号，车辆引起
+ 相位/频率误差 → 输出误差电压
+ 灵敏度
+ ★★★★★ 可测自行车/电动车/行人拖车
+ 抗干扰
+ ★★★ 环路锁定本身有滤波作用
+ 成本
+ 中（PLL IC 或 MCU 内置 PLL 外设）
+ 适用
+ 混行车道、ETC 车道、摩托车检测
+ 要点
+ 环路带宽要窄：抗抖但响应慢，需折中
+ 适合与 ① 组合做双通道校验
+ ✅ 高灵敏场景备选
+
+
+
+ ③ 电桥阻抗检测 ★★
+ 原理
+ 环路与参考臂构成平衡电桥，
+ 车辆使阻抗失衡 → 输出失调电压
+ 灵敏度
+ ★★ 中低，依赖桥臂匹配精度
+ 抗干扰
+ ★★ 温漂/老化使零位漂移严重
+ 成本
+ 低（纯模拟）
+ 适用
+ 早期产品 / 教学演示
+ 要点
+ 需定期人工调零，现场维护成本高
+ ⚠️ 不推荐量产
+
+
+
+ ④ 多频扫频 + 自适应调谐 ★★★★
+ 原理
+ DDS/扫频实时搜索谐振点，
+ 自动调谐避开干扰频段（变频器/谐波）
+ 灵敏度
+ ★★★★ 扫频带宽内全频段可调
+ 抗干扰
+ ★★★★★ 变频器干扰场景的终极解
+ 成本
+ 高（DDS/高精度 ADC + 算法）
+ 适用
+ 工业区/充电桩/变频器密集场所
+ 要点
+ 与 ① 兼容：频率计数做粗判，
+ 扫频谱特征做细判与干扰识别
+ ✅ 复杂电磁环境旗舰方案
+
\ No newline at end of file
diff --git a/loop-detector/fig2-schematic.png b/loop-detector/fig2-schematic.png
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index 0000000..8fa5f67
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diff --git a/loop-detector/fig2-schematic.svg b/loop-detector/fig2-schematic.svg
new file mode 100644
index 0000000..0d51366
--- /dev/null
+++ b/loop-detector/fig2-schematic.svg
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+
+
+
+
+
+
+
+ 环路车检器原理图 — LC 振荡 + 频率计数方案（推荐①）
+ 信号链：环形线圈 → 浪涌保护 → 匹配变压器 → 谐振/考毕兹振荡 → 比较器整形 → MCU 测频判车 → 光耦隔离 → 继电器输出
+
+
+
+ VCC 5V
+
+ GND
+
+ GND（电源地）
+
+
+
+
+ 路面（切割槽）
+
+
+
+ 环形线圈 3~5 匝
+ L≈50~200μH（待现场验证）
+
+
+
+ 引线（双绞屏蔽 ≤20m）
+
+
+
+ A
+
+ B
+
+ 浪涌保护
+
+
+
+
+
+
+
+
+ TVS1
+
+
+
+
+ RV1
+
+
+
+ T1 匹配变压器 1:1~1:2
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ C1 谐振电容
+ 100~470pF
+
+
+ Cc1 10pF
+
+
+
+
+
+
+
+
+ 考毕兹振荡器（基极调谐）
+
+
+
+
+ Rb1 100k
+
+
+
+
+ Rb2 47k
+
+
+
+
+
+
+
+
+
+ C3 100p
+
+
+
+
+
+
+
+ Q1
+ S9018
+
+
+
+
+ Rc 2.2k
+
+
+
+
+
+
+ Lx 谐振
+
+
+
+
+
+
+
+ C2 100p
+
+
+
+
+
+ Cc2
+
+
+
+ U1 比较器（带回差）
+
+
+
+
+ +
+ −
+
+
+
+
+
+
+
+
+
+ Vref 分压
+ (R3/R4)
+
+ 方波输出 f≈f₀
+
+
+
+ MCU
+ STM32/GD32F103
+ · 定时器输入捕获测周期
+ · f = Fclk / period → Δf
+ · 数字滤波 + 消抖
+ · 灵敏度阈值(多档)判断
+ · 存在/通过 状态机
+ · 基准频率慢速自适应(抗温漂)
+ · 继电器输出 + 自检/看门狗
+
+ PA0 捕获
+
+ PA1
+
+
+
+
+
+
+
+
+
+ D2 状态LED
+ R6 限流
+
+
+ VDD 3.3V
+
+
+
+ U2 光耦
+
+
+
+
+
+
+
+
+
+
+
+
+
+ R5
+
+
+
+
+
+
+
+
+
+ Q2
+ N-MOS
+
+
+ D
+ S
+
+
+
+ K1
+
+
+
+
+
+
+
+
+
+
+ NO
+ NC
+ COM
+ → 道闸/PLC
+
+
+ K1 线圈接 VCC(或外供)
+
+
+
+ 电源与保护
+
+ VIN 12~24V
+
+
+
+
+
+
+ D1 防反接
+ TVS2 吸收浪涌
+
+
+ U3 LDO 5V
+
+
+ U4 LDO 3.3V
+
+
+
+
+
+
+
+
+ Cin
+
+
+
+
+ C5
+
+
+
+
+ C6
+
+
+
+ 元件图例
+ L 电感（线圈符号）
+
+ C 电容
+
+ R 电阻
+
+ TVS 双向
+
+
+ NPN 三极管
+
+
+
+
+ MOS
+
+ 继电器
+
+
+ 关键设计点：① 环路经匹配变压器隔离耦合，直连会受地环路干扰；② 谐振电容 C1 决定频段，频率 f₀≈1/(2π√(LC))；③ 灵敏度=Δf 阈值，建议多档可调 + 回差；④ 基准频率上电自学习 + 慢速跟踪，抗温漂；⑤ 输出必须光耦隔离，防浪涌反灌烧 MCU；⑥ 软件加看门狗，继电器粘连检测。
+ ⚠️ 数值为典型参考：线圈电感取决于尺寸/匝数/引线长度，谐振频率推荐 20~150kHz（越低抗干扰越差、灵敏度越高，需现场折中）。
+
\ No newline at end of file
diff --git a/loop-detector/inline_svg.py b/loop-detector/inline_svg.py
new file mode 100644
index 0000000..e474484
--- /dev/null
+++ b/loop-detector/inline_svg.py
@@ -0,0 +1,68 @@
+#!/usr/bin/env python3
+"""Extract SVGs from HTML, inline styles (light theme), output standalone .svg files."""
+import re, sys, html
+
+SRC = "/root/.openclaw/workspace/loop-detector/loop-detector-principle.html"
+
+CSS = {
+ "title": {"font-size": "20px", "font-weight": "650", "fill": "#172033"},
+ "label": {"font-size": "14px", "font-weight": "600", "fill": "#172033"},
+ "small": {"font-size": "12px", "fill": "#5b6475"},
+ "tiny": {"font-size": "11px", "fill": "#5b6475"},
+ "node": {"stroke": "#64748b", "stroke-width": "1"},
+ "neutral": {"fill": "#e2e8f0"},
+ "input": {"fill": "#bfdbfe"},
+ "process": {"fill": "#c7d2fe"},
+ "storage": {"fill": "#99f6e4"},
+ "external":{"fill": "#fde68a"},
+ "risk": {"fill": "#fecaca"},
+ "edge": {"stroke": "#64748b", "stroke-width": "1.5", "fill": "none"},
+ "wire": {"stroke": "#64748b", "stroke-width": "1.3", "fill": "none"},
+ "wireb": {"stroke": "#64748b", "stroke-width": "2", "fill": "none"},
+ "zone": {"fill": "none", "stroke": "#64748b", "stroke-width": "1",
+ "stroke-dasharray": "6 5", "opacity": "0.8"},
+ "comp": {"fill": "none", "stroke": "#172033", "stroke-width": "1.6"},
+ "compf": {"fill": "#172033", "stroke": "none"},
+ "rec": {"fill": "#172033", "stroke": "none"},
+ "rec-o": {"fill": "none", "stroke": "#172033", "stroke-width": "1.4"},
+ "badge": {"fill": "#16a34a"},
+ "badge-t": {"fill": "#ffffff", "font-size": "11px", "font-weight": "700"},
+ "hl": {"stroke": "#16a34a", "stroke-width": "2.5"},
+}
+
+def inline(el):
+ classes = el.get("class", "").split()
+ merged = {}
+ for c in classes:
+ if c in CSS:
+ merged.update(CSS[c])
+ # element-level attributes override classes (fill attr etc.)
+ for attr in ("fill", "stroke", "stroke-width", "opacity"):
+ v = el.get(attr)
+ if v is not None:
+ merged[attr] = v
+ if merged:
+ style = "; ".join(f"{k}: {v}" for k, v in merged.items())
+ old = el.get("style", "")
+ el.set("style", (old + ";" + style).strip(";") if old else style)
+ el.attrib.pop("class", None)
+ for child in el:
+ inline(child)
+
+def process(svg_text, out_path):
+ # drop ", "", svg_text, flags=re.S)
+ import xml.etree.ElementTree as ET
+ root = ET.fromstring(svg_text)
+ # add width/height for predictable output
+ root.set("xmlns", "http://www.w3.org/2000/svg")
+ inline(root)
+ tree = ET.ElementTree(root)
+ tree.write(out_path, encoding="utf-8", xml_declaration=True)
+ print("wrote", out_path)
+
+data = open(SRC, encoding="utf-8").read()
+svgs = re.findall(r"", data, flags=re.S)
+print("found", len(svgs), "svgs")
+process(svgs[0], "/root/.openclaw/workspace/loop-detector/fig1-methods.svg")
+process(svgs[1], "/root/.openclaw/workspace/loop-detector/fig2-schematic.svg")
diff --git a/loop-detector/loop-detector-kicad/gen_sch.py b/loop-detector/loop-detector-kicad/gen_sch.py
new file mode 100644
index 0000000..3b53cd4
--- /dev/null
+++ b/loop-detector/loop-detector-kicad/gen_sch.py
@@ -0,0 +1,258 @@
+#!/usr/bin/env python3
+"""Generate KiCad 7 schematic (.kicad_sch) for the loop vehicle detector."""
+import re, uuid, os
+
+BASE = "/root/.openclaw/workspace/loop-detector/loop-detector-kicad"
+SYM = os.path.join(BASE, "loopdet.kicad_sym")
+SCH = os.path.join(BASE, "loop-detector.kicad_sch")
+
+def uid():
+ return str(uuid.uuid4())
+
+# ---------- extract lib_symbols from .kicad_sym ----------
+data = open(SYM, encoding="utf-8").read()
+# only extract TOP-LEVEL (symbol "X" ...) blocks: track paren depth while scanning
+sym_blocks = []
+pat = re.compile(r'\(symbol "([^"]+)"')
+# find all matches, then filter to depth-1 (inside kicad_symbol_lib only)
+depth = 0
+top_starts = []
+for m in pat.finditer(data):
+ # compute depth at match start by counting parens before it
+ prefix = data[:m.start()]
+ d = prefix.count('(') - prefix.count(')')
+ if d == 1: # directly inside kicad_symbol_lib
+ top_starts.append(m.start())
+for start in top_starts:
+ depth = 0
+ j = start
+ while j < len(data):
+ if data[j] == '(':
+ depth += 1
+ elif data[j] == ')':
+ depth -= 1
+ if depth == 0:
+ break
+ j += 1
+ sym_blocks.append(data[start:j+1])
+
+# embedded symbol names must carry the library prefix (e.g. "loopdet:C") so that
+# lib_id "loopdet:C" resolves to the embedded definition without hitting the table
+import re as _re
+def _prefix(sym_block):
+ return _re.sub(r'\(symbol "([^"]+)"', r'(symbol "loopdet:\1"', sym_block, count=1)
+lib_symbols = "(lib_symbols\n" + "\n".join(" " + _prefix(b) for b in sym_blocks) + "\n)\n"
+
+# ---------- components ----------
+# (lib, ref, value, x, y, rot, ref_at, val_at)
+COMPONENTS = [
+ ("CONN2", "J1", "CONN_2P", 40, 130, 0, (40, 136), (40, 124)),
+ ("TVS_BI", "TVS1", "TVS_BIDI", 62, 130, 0, (62, 136), (62, 124)),
+ ("XFMR", "T1", "1:1", 90, 130, 0, (90, 138), (90, 120)),
+ ("C", "C1", "100~470p", 107, 130, 90, (113, 136), (113, 124)),
+ ("Q_NPN", "Q1", "S9018", 130, 130, 0, (126.5, 136),(126.5, 124)),
+ ("R", "Rc", "2.2k", 138, 126.19,0, (134.5, 132),(134.5, 120)),
+ ("R", "Rb1", "100k", 124.92,121.5,90, (131, 121.5),(131, 117)),
+ ("R", "Rb2", "47k", 124.92,137.5,90, (131, 137.5),(131, 133)),
+ ("R", "Re", "1k", 132.54,139.5,90, (138.5, 139.5),(138.5, 135)),
+ ("C", "C2", "100p", 138, 135.5, 90, (144, 135.5),(144, 131)),
+ ("C", "Cc2", "10p", 148, 126.19,0, (148, 132), (148, 120)),
+ ("COMP", "U1", "LM393", 170, 130, 0, (170, 137), (170, 123)),
+ ("R", "R3", "10k", 150, 124, 90, (156, 124), (156, 119.5)),
+ ("R", "R4", "10k", 150, 138.5, 90, (156, 138.5),(156, 134)),
+ ("MCU", "MCU1", "STM32F103C8", 215, 130, 0, (215, 143), (215, 117)),
+ ("R", "R5", "1k", 245, 124.92,0, (245, 131), (245, 119)),
+ ("OPTO", "U2", "PC817", 265, 124.92,0, (265, 131), (265, 119)),
+ ("MOS_N", "Q2", "N-MOS", 300, 126.19,0, (296.5, 132),(296.5, 120)),
+ ("RELAY_SPDT","K1", "SPDT 12V", 325, 122.38,0, (325, 130), (325, 116)),
+ ("R", "R6", "1k", 245, 130, 0, (245, 136), (245, 124)),
+ ("LED", "D2", "LED", 280, 130, 0, (280, 136), (280, 124)),
+]
+
+# ---------- wires ----------
+WIRES = [
+ # A net: J1.p1 - TVS1.p1 - T1.p1
+ ((37.46, 127.46), (82.38, 127.46)),
+ ((59.46, 127.46), (59.46, 130)),
+ # B net: J1.p2 - TVS1.p2 - T1.p2
+ ((37.46, 132.54), (82.38, 132.54)),
+ ((64.54, 132.54), (64.54, 130)),
+ # T1 sec upper: p3 - C1.p1 - base input
+ ((97.62, 127.46), (110, 127.46)),
+ ((110, 127.46), (110, 130)),
+ ((110, 130), (124.92, 130)),
+ # T1 sec lower: p4 - C1.p2 - GND
+ ((97.62, 132.54), (107, 132.54)),
+ ((107, 132.54), (107, 145)),
+ # VCC bus
+ ((100, 115), (320, 115)),
+ ((140.54, 126.19), (140.54, 115)),
+ ((124.92, 118.96), (124.92, 115)),
+ ((150, 121.46), (150, 115)),
+ ((317.38, 119.84), (317.38, 115)),
+ # GND bus
+ ((100, 145), (340, 145)),
+ ((124.92, 140.04), (124.92, 145)),
+ ((132.54, 142.04), (132.54, 145)),
+ ((138, 138.04), (138, 145)),
+ ((257.38, 127.46), (257.38, 145)),
+ ((302.54, 130), (302.54, 145)),
+ ((282.54, 130), (282.54, 145)),
+ # base net
+ ((124.92, 124.04), (124.92, 134.96)),
+ # collector net
+ ((132.54, 126.19), (145.46, 126.19)),
+ ((138, 126.19), (138, 132.96)),
+ # emitter
+ ((132.54, 133.81), (132.54, 136.96)),
+ # comp in+
+ ((150.54, 126.19), (162.38, 126.19)),
+ ((162.38, 126.19), (162.38, 127.46)),
+ # vref
+ ((150, 126.54), (150, 135.96)),
+ ((150, 132.54), (162.38, 132.54)),
+ # comp out -> PA0
+ ((177.62, 130), (177.62, 124.92)),
+ ((177.62, 124.92), (202.3, 124.92)),
+ # PA1 -> R5
+ ((227.7, 124.92), (242.46, 124.92)),
+ # R5 -> OPTO.1
+ ((247.54, 124.92), (257.38, 124.92)),
+ ((257.38, 124.92), (257.38, 122.38)),
+ # OPTO.4 -> gate
+ ((272.62, 122.38), (294.92, 122.38)),
+ ((294.92, 122.38), (294.92, 126.19)),
+ # drain -> K1.A2
+ ((302.54, 122.38), (317.38, 122.38)),
+ ((317.38, 122.38), (317.38, 124.92)),
+ # PA2 -> R6
+ ((227.7, 130), (242.46, 130)),
+ # R6 -> D2.A
+ ((247.54, 130), (277.46, 130)),
+]
+
+# ---------- net labels ----------
+LABELS = [
+ ("VCC", (100, 115), 0),
+ ("GND", (100, 145), 0),
+ ("VCC", (227.7, 135.08), 0),
+ ("GND", (202.3, 135.08), 0),
+ ("COM", (332.62, 122.38), 0),
+ ("NO", (332.62, 117.3), 0),
+ ("NC", (332.62, 127.46), 0),
+]
+
+# ---------- texts ----------
+TEXTS = [
+ ("环路车检器原理图 — LC 振荡 + 频率计数方案（推荐①）", (20, 20), 3.5),
+ ("信号链：环形线圈 → T1 匹配变压器 → 考毕兹振荡 → 比较器整形 → MCU 测频判车 → 光耦隔离 → 继电器输出", (20, 30), 1.5),
+ ("接路面环形线圈（3~5匝，双绞屏蔽线 ≤20m）", (20, 108), 1.27),
+ ("→ 道闸控制器 / PLC 输入", (340, 114), 1.27),
+ ("【设计说明】", (20, 165), 1.5),
+ ("1) 线圈经 T1 匹配变压器隔离耦合，抗地环路干扰；", (20, 173), 1.27),
+ ("2) 谐振频率 f0 ≈ 1/(2π√(L·C1))，建议 20~150kHz（待现场验证）；", (20, 181), 1.27),
+ ("3) MCU 周期法测频（输入捕获），灵敏度阈值多档可调 + 回差防抖；", (20, 189), 1.27),
+ ("4) 基准频率上电自学习 + 慢速跟踪，抗温漂（雨雪/昼夜温差）；", (20, 197), 1.27),
+ ("5) 输出经光耦 U2 隔离驱动继电器 K1，防浪涌反灌烧 MCU；", (20, 205), 1.27),
+ ("6) 软件加看门狗；继电器粘连/掉线检测；", (20, 213), 1.27),
+ ("7) 电源：VIN 12~24V → 防反接 + TVS → LDO 5V → LDO 3.3V（本页未画出）；", (20, 221), 1.27),
+ ("8) 相邻车道串扰：线圈间距 ≥1m，必要时交替频率；", (20, 229), 1.27),
+ ("【关键参数（参考值，待现场验证）】", (240, 165), 1.5),
+ ("C1: 100~470pF C2: 100pF", (240, 173), 1.27),
+ ("Rb1: 100k Rb2: 47k", (240, 181), 1.27),
+ ("Rc: 2.2k Re: 1k", (240, 189), 1.27),
+ ("Q1: S9018/2N3904 Q2: N-MOS", (240, 197), 1.27),
+ ("U1: LM393 比较器 U2: PC817 光耦", (240, 205), 1.27),
+ ("K1: SPDT 12V/24V 继电器", (240, 213), 1.27),
+ ("MCU: STM32F103/GD32F103", (240, 221), 1.27),
+]
+
+# ---------- build ----------
+def fmt_xy(p):
+ return f"(xy {p[0]:g} {p[1]:g})"
+
+parts = []
+ROOT_UUID = uid()
+parts.append("(kicad_sch")
+parts.append(" (version 20230121)")
+parts.append(' (generator eeschema)')
+parts.append(f" (uuid {ROOT_UUID})")
+parts.append(' (paper "A3")')
+parts.append(" (title_block")
+parts.append(' (title "Loop Vehicle Detector")')
+parts.append(' (date "2026-08-21")')
+parts.append(' (rev "1.0")')
+parts.append(' (company "xde")')
+parts.append(' (comment 1 "LC Oscillation + Frequency Counting")')
+parts.append(" )")
+parts.append("")
+# lib_symbols (indent 2)
+parts.append(lib_symbols.rstrip("\n"))
+parts.append("")
+# components
+for lib, ref, value, x, y, rot, ref_at, val_at in COMPONENTS:
+ parts.append(" (symbol")
+ parts.append(f" (lib_id \"loopdet:{lib}\")")
+ parts.append(f" (at {x:g} {y:g} {rot})")
+ parts.append(" (unit 1)")
+ parts.append(" (in_bom yes)")
+ parts.append(" (on_board yes)")
+ parts.append(" (dnp no)")
+ parts.append(f" (uuid {uid()})")
+ parts.append(f" (property \"Reference\" \"{ref}\" (at {ref_at[0]:g} {ref_at[1]:g} 0) (effects (font (size 1.27 1.27)) (justify left)))")
+ parts.append(f" (property \"Value\" \"{value}\" (at {val_at[0]:g} {val_at[1]:g} 0) (effects (font (size 1.27 1.27)) (justify left)))")
+ parts.append(f" (property \"Footprint\" \"\" (at {x:g} {y:g} 0) (effects (font (size 1.27 1.27)) hide))")
+ parts.append(f" (property \"Datasheet\" \"\" (at {x:g} {y:g} 0) (effects (font (size 1.27 1.27)) hide))")
+ # pin uuids (number of pins depends on lib)
+ PINMAP = {
+ "R": ["1", "2"], "C": ["1", "2"], "TVS_BI": ["1", "2"], "LED": ["A", "K"],
+ "Q_NPN": ["B", "C", "E"], "MOS_N": ["G", "D", "S"],
+ "XFMR": ["1", "2", "3", "4"], "OPTO": ["1", "2", "4", "3"],
+ "COMP": ["+", "-", "OUT"],
+ "MCU": ["PA0", "GND", "PA1", "PA2", "VDD"],
+ "RELAY_SPDT": ["A1", "A2", "COM", "NO", "NC"],
+ "CONN2": ["1", "2"],
+ }
+ for pn in PINMAP[lib]:
+ parts.append(f" (pin \"{pn}\" (uuid {uid()}))")
+ parts.append(" (instances")
+ parts.append(" (project \"loop-detector\"")
+ parts.append(f" (path \"/{ROOT_UUID}\"")
+ parts.append(f" (reference \"{ref}\") (unit 1)")
+ parts.append(" )")
+ parts.append(" )")
+ parts.append(" )")
+ parts.append(" )")
+parts.append("")
+# wires
+for p1, p2 in WIRES:
+ parts.append(" (wire")
+ parts.append(f" (pts {fmt_xy(p1)} {fmt_xy(p2)})")
+ parts.append(" (stroke (width 0) (type default))")
+ parts.append(f" (uuid {uid()})")
+ parts.append(" )")
+parts.append("")
+# net labels
+for name, pos, ang in LABELS:
+ parts.append(" (label")
+ parts.append(f" \"{name}\" (at {pos[0]:g} {pos[1]:g} {ang})")
+ parts.append(" (effects (font (size 1.27 1.27)) (justify left bottom))")
+ parts.append(f" (uuid {uid()})")
+ parts.append(" )")
+parts.append("")
+# texts
+for s, pos, size in TEXTS:
+ parts.append(" (text")
+ parts.append(f" \"{s}\" (at {pos[0]:g} {pos[1]:g} 0)")
+ parts.append(f" (effects (font (size {size:g} {size:g})))")
+ parts.append(f" (uuid {uid()})")
+ parts.append(" )")
+parts.append("")
+parts.append(" (sheet_instances")
+parts.append(' (path "/" (page "1"))')
+parts.append(" )")
+parts.append(")")
+
+out = "\n".join(parts) + "\n"
+open(SCH, "w", encoding="utf-8").write(out)
+print("wrote", SCH, len(out), "bytes")
diff --git a/loop-detector/loop-detector-kicad/loop-detector-preview.png b/loop-detector/loop-detector-kicad/loop-detector-preview.png
new file mode 100644
index 0000000..b82d1e2
Binary files /dev/null and b/loop-detector/loop-detector-kicad/loop-detector-preview.png differ
diff --git a/loop-detector/loop-detector-kicad/loop-detector.kicad_pro b/loop-detector/loop-detector-kicad/loop-detector.kicad_pro
new file mode 100644
index 0000000..ae4cda7
--- /dev/null
+++ b/loop-detector/loop-detector-kicad/loop-detector.kicad_pro
@@ -0,0 +1,83 @@
+{
+ "board": {
+ "design_settings": {
+ "defaults": {
+ "apply_defaults_to_fp_fields": false,
+ "apply_defaults_to_new_footprints": false
+ }
+ }
+ },
+ "boards": [],
+ "cvpcb": {
+ "equivalence_files": []
+ },
+ "erc": {
+ "erc_exclusions": [],
+ "meta": {
+ "version": 0
+ }
+ },
+ "libraries": {
+ "pinned_footprint_libs": [],
+ "pinned_symbol_libs": []
+ },
+ "meta": {
+ "filename": "loop-detector.kicad_pro",
+ "version": 1
+ },
+ "net_settings": {
+ "classes": [
+ {
+ "bus_width": 12,
+ "clearance": 0.2,
+ "diff_pair_gap": 0.25,
+ "diff_pair_via_gap": 0.25,
+ "diff_pair_width": 0.2,
+ "line_style": 0,
+ "microvia_diameter": 0.3,
+ "microvia_drill": 0.1,
+ "name": "Default",
+ "pcb_color": "rgba(0, 0, 0, 0.000)",
+ "schematic_color": "rgba(0, 0, 0, 0.000)",
+ "track_width": 0.25,
+ "via_diameter": 0.8,
+ "via_drill": 0.4,
+ "wire_width": 6
+ }
+ ],
+ "meta": {
+ "version": 3
+ },
+ "net_colors": null,
+ "netclass_assignments": null,
+ "netclass_patterns": []
+ },
+ "pcbnew": {
+ "last_paths": {
+ "gencad": "",
+ "netlist": "",
+ "plot": "",
+ "pos": "",
+ "specctra_dsn": "",
+ "step": "",
+ "svg": "",
+ "vrml": ""
+ },
+ "page_layout_descr_file": ""
+ },
+ "schematic": {
+ "legacy_lib_dir": "",
+ "legacy_lib_list": [],
+ "meta": {
+ "version": 1
+ },
+ "page_layout_descr_file": ""
+ },
+ "sheets": [
+ [
+ "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa",
+ "Root"
+ ]
+ ],
+ "text_variables": {}
+}
diff --git a/loop-detector/loop-detector-kicad/loop-detector.kicad_sch b/loop-detector/loop-detector-kicad/loop-detector.kicad_sch
new file mode 100644
index 0000000..25d4097
--- /dev/null
+++ b/loop-detector/loop-detector-kicad/loop-detector.kicad_sch
@@ -0,0 +1,1227 @@
+(kicad_sch
+ (version 20230121)
+ (generator eeschema)
+ (uuid 917e639c-8969-4741-a7cd-e315437b423c)
+ (paper "A3")
+ (title_block
+ (title "Loop Vehicle Detector")
+ (date "2026-08-21")
+ (rev "1.0")
+ (company "xde")
+ (comment 1 "LC Oscillation + Frequency Counting")
+ )
+
+(lib_symbols
+ (symbol "loopdet:R"
+ (pin_numbers hide) (pin_names (offset 0))
+ (in_bom yes)
+ (on_board yes)
+ (property "Reference" "R" (at 0 2.54 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Value" "R" (at 0 -2.54 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Footprint" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (property "Datasheet" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (symbol "R_0_1"
+ (rectangle (start -1.27 -1.27) (end 1.27 1.27)
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ )
+ (symbol "R_1_1"
+ (pin passive line (at -2.54 0 0) (length 1.27)
+ (name "~" (effects (font (size 1.27 1.27))))
+ (number "1" (effects (font (size 1.27 1.27)))))
+ (pin passive line (at 2.54 0 0) (length 1.27)
+ (name "~" (effects (font (size 1.27 1.27))))
+ (number "2" (effects (font (size 1.27 1.27)))))
+ )
+ )
+ (symbol "loopdet:C"
+ (pin_numbers hide) (pin_names (offset 0))
+ (in_bom yes)
+ (on_board yes)
+ (property "Reference" "C" (at 0 2.54 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Value" "C" (at 0 -2.54 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Footprint" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (property "Datasheet" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (symbol "C_0_1"
+ (polyline (pts (xy -0.635 -1.905) (xy -0.635 1.905))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 0.635 -1.905) (xy 0.635 1.905))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ )
+ (symbol "C_1_1"
+ (pin passive line (at -2.54 0 0) (length 1.27)
+ (name "~" (effects (font (size 1.27 1.27))))
+ (number "1" (effects (font (size 1.27 1.27)))))
+ (pin passive line (at 2.54 0 0) (length 1.27)
+ (name "~" (effects (font (size 1.27 1.27))))
+ (number "2" (effects (font (size 1.27 1.27)))))
+ )
+ )
+ (symbol "loopdet:Q_NPN"
+ (pin_numbers hide) (pin_names (offset 0))
+ (in_bom yes)
+ (on_board yes)
+ (property "Reference" "Q" (at -5.08 6.35 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Value" "Q" (at -5.08 -6.35 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Footprint" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (property "Datasheet" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (symbol "Q_NPN_0_1"
+ (circle (center 0 0) (radius 1.27)
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy -3.81 0) (xy -1.27 0))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 0 0) (xy 1.27 -2.54) (xy 1.27 -3.81))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 0 0) (xy 1.27 2.54) (xy 1.27 3.81))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 1.02 1.78) (xy 1.45 1.65) (xy 1.35 2.2))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ )
+ (symbol "Q_NPN_1_1"
+ (pin passive line (at -5.08 0 0) (length 1.27)
+ (name "B" (effects (font (size 1.27 1.27))))
+ (number "B" (effects (font (size 1.27 1.27)))))
+ (pin passive line (at 2.54 -3.81 90) (length 1.27)
+ (name "C" (effects (font (size 1.27 1.27))))
+ (number "C" (effects (font (size 1.27 1.27)))))
+ (pin passive line (at 2.54 3.81 270) (length 1.27)
+ (name "E" (effects (font (size 1.27 1.27))))
+ (number "E" (effects (font (size 1.27 1.27)))))
+ )
+ )
+ (symbol "loopdet:MOS_N"
+ (pin_numbers hide) (pin_names (offset 0))
+ (in_bom yes)
+ (on_board yes)
+ (property "Reference" "Q" (at -5.08 6.35 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Value" "Q" (at -5.08 -6.35 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Footprint" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (property "Datasheet" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (symbol "MOS_N_0_1"
+ (polyline (pts (xy -3.81 0) (xy -1.27 0))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy -1.27 -3.81) (xy -1.27 3.81))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 0 -3.81) (xy 0 3.81))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 0 -3.81) (xy 2.54 -3.81))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 0 3.81) (xy 2.54 3.81))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 1.27 1.2) (xy 0.45 0) (xy 1.27 -1.2))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ )
+ (symbol "MOS_N_1_1"
+ (pin passive line (at -5.08 0 0) (length 1.27)
+ (name "G" (effects (font (size 1.27 1.27))))
+ (number "G" (effects (font (size 1.27 1.27)))))
+ (pin passive line (at 2.54 -3.81 90) (length 1.27)
+ (name "D" (effects (font (size 1.27 1.27))))
+ (number "D" (effects (font (size 1.27 1.27)))))
+ (pin passive line (at 2.54 3.81 270) (length 1.27)
+ (name "S" (effects (font (size 1.27 1.27))))
+ (number "S" (effects (font (size 1.27 1.27)))))
+ )
+ )
+ (symbol "loopdet:LED"
+ (pin_numbers hide) (pin_names (offset 0))
+ (in_bom yes)
+ (on_board yes)
+ (property "Reference" "D" (at 0 2.54 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Value" "D" (at 0 -2.54 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Footprint" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (property "Datasheet" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (symbol "LED_0_1"
+ (polyline (pts (xy -1.27 -1.27) (xy -1.27 1.27) (xy 1.27 0) (xy -1.27 -1.27))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 1.27 -1.27) (xy 1.27 1.27))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 1.27 0) (xy 2.54 0))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy -2.29 -1.02) (xy -1.52 -0.51))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy -2.29 -1.4) (xy -1.52 -0.89))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ )
+ (symbol "LED_1_1"
+ (pin passive line (at -2.54 0 0) (length 1.27)
+ (name "A" (effects (font (size 1.27 1.27))))
+ (number "A" (effects (font (size 1.27 1.27)))))
+ (pin passive line (at 2.54 0 0) (length 1.27)
+ (name "K" (effects (font (size 1.27 1.27))))
+ (number "K" (effects (font (size 1.27 1.27)))))
+ )
+ )
+ (symbol "loopdet:TVS_BI"
+ (pin_numbers hide) (pin_names (offset 0))
+ (in_bom yes)
+ (on_board yes)
+ (property "Reference" "TVS" (at 0 2.54 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Value" "TVS" (at 0 -2.54 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Footprint" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (property "Datasheet" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (symbol "TVS_BI_0_1"
+ (polyline (pts (xy -1.27 -1.27) (xy -1.27 1.27) (xy 0 0) (xy -1.27 -1.27))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 1.27 -1.27) (xy 1.27 1.27) (xy 0 0) (xy 1.27 -1.27))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy -3.81 0) (xy -1.27 0))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 1.27 0) (xy 3.81 0))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ )
+ (symbol "TVS_BI_1_1"
+ (pin passive line (at -2.54 0 0) (length 1.27)
+ (name "~" (effects (font (size 1.27 1.27))))
+ (number "1" (effects (font (size 1.27 1.27)))))
+ (pin passive line (at 2.54 0 0) (length 1.27)
+ (name "~" (effects (font (size 1.27 1.27))))
+ (number "2" (effects (font (size 1.27 1.27)))))
+ )
+ )
+ (symbol "loopdet:XFMR"
+ (pin_numbers hide) (pin_names (offset 0))
+ (in_bom yes)
+ (on_board yes)
+ (property "Reference" "T" (at -7.62 5.08 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Value" "T" (at -7.62 -5.08 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Footprint" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (property "Datasheet" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (symbol "XFMR_0_1"
+ (polyline (pts (xy -2.54 -2.54) (xy -1.27 -1.27) (xy -3.81 -1.27) (xy -1.27 1.27) (xy -3.81 1.27) (xy -2.54 2.54))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 2.54 -2.54) (xy 1.27 -1.27) (xy 3.81 -1.27) (xy 1.27 1.27) (xy 3.81 1.27) (xy 2.54 2.54))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy -0.635 -2.54) (xy -0.635 2.54))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 0.635 -2.54) (xy 0.635 2.54))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (circle (center -2.54 -2.54) (radius 0.4)
+ (stroke (width 0.254) (type default)) (fill (type outline)))
+ (circle (center 2.54 -2.54) (radius 0.4)
+ (stroke (width 0.254) (type default)) (fill (type outline)))
+ (polyline (pts (xy -6.35 -2.54) (xy -2.54 -2.54))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy -6.35 2.54) (xy -2.54 2.54))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 2.54 -2.54) (xy 6.35 -2.54))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 2.54 2.54) (xy 6.35 2.54))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ )
+ (symbol "XFMR_1_1"
+ (pin passive line (at -7.62 -2.54 0) (length 1.27)
+ (name "~" (effects (font (size 1.27 1.27))))
+ (number "1" (effects (font (size 1.27 1.27)))))
+ (pin passive line (at -7.62 2.54 0) (length 1.27)
+ (name "~" (effects (font (size 1.27 1.27))))
+ (number "2" (effects (font (size 1.27 1.27)))))
+ (pin passive line (at 7.62 -2.54 180) (length 1.27)
+ (name "~" (effects (font (size 1.27 1.27))))
+ (number "3" (effects (font (size 1.27 1.27)))))
+ (pin passive line (at 7.62 2.54 180) (length 1.27)
+ (name "~" (effects (font (size 1.27 1.27))))
+ (number "4" (effects (font (size 1.27 1.27)))))
+ )
+ )
+ (symbol "loopdet:OPTO"
+ (pin_numbers hide) (pin_names (offset 0))
+ (in_bom yes)
+ (on_board yes)
+ (property "Reference" "U" (at -7.62 5.08 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Value" "U" (at -7.62 -5.08 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Footprint" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (property "Datasheet" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (symbol "OPTO_0_1"
+ (rectangle (start -5.08 -3.81) (end 5.08 3.81)
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (text "OPTO" (at 0 0 0) (effects (font (size 1.27 1.27))))
+ (polyline (pts (xy -6.35 -2.54) (xy -4.32 -2.54))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy -4.32 -2.54) (xy -3.3 -2.54) (xy -3.81 -1.4) (xy -4.32 -2.54))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy -6.35 2.54) (xy -3.81 2.54) (xy -3.81 -1.4))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (circle (center 2.54 0) (radius 1.27)
+ (stroke (width 0.254) (type default)) (fill (type none)))
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diff --git a/loop-detector/loop-detector-kicad/loop-detector.pdf b/loop-detector/loop-detector-kicad/loop-detector.pdf
new file mode 100644
index 0000000..14de51f
Binary files /dev/null and b/loop-detector/loop-detector-kicad/loop-detector.pdf differ
diff --git a/loop-detector/loop-detector-kicad/loopdet.kicad_sym b/loop-detector/loop-detector-kicad/loopdet.kicad_sym
new file mode 100644
index 0000000..9a2f791
--- /dev/null
+++ b/loop-detector/loop-detector-kicad/loopdet.kicad_sym
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+ (on_board yes)
+ (property "Reference" "K" (at -7.62 6.35 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Value" "K" (at -7.62 -6.35 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Footprint" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (property "Datasheet" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (symbol "RELAY_SPDT_0_1"
+ (rectangle (start -5.08 -2.54) (end 2.54 2.54)
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy -5.08 -1.9) (xy 2.54 1.9))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy -6.35 -2.54) (xy -5.08 -2.54))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy -6.35 2.54) (xy -5.08 2.54))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 2.54 0) (xy 5.08 0))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 5.08 0) (xy 5.08 5.08))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 5.08 5.08) (xy 6.35 5.08))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (polyline (pts (xy 5.08 -5.08) (xy 6.35 -5.08))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (circle (center 5.08 0) (radius 0.4)
+ (stroke (width 0.254) (type default)) (fill (type outline)))
+ (circle (center 5.08 -5.08) (radius 0.4)
+ (stroke (width 0.254) (type default)) (fill (type outline)))
+ (circle (center 5.08 5.08) (radius 0.4)
+ (stroke (width 0.254) (type default)) (fill (type outline)))
+ )
+ (symbol "RELAY_SPDT_1_1"
+ (pin passive line (at -7.62 -2.54 0) (length 1.27)
+ (name "A1" (effects (font (size 1.27 1.27))))
+ (number "A1" (effects (font (size 1.27 1.27)))))
+ (pin passive line (at -7.62 2.54 0) (length 1.27)
+ (name "A2" (effects (font (size 1.27 1.27))))
+ (number "A2" (effects (font (size 1.27 1.27)))))
+ (pin passive line (at 7.62 0 180) (length 1.27)
+ (name "COM" (effects (font (size 1.27 1.27))))
+ (number "COM" (effects (font (size 1.27 1.27)))))
+ (pin passive line (at 7.62 -5.08 180) (length 1.27)
+ (name "NO" (effects (font (size 1.27 1.27))))
+ (number "NO" (effects (font (size 1.27 1.27)))))
+ (pin passive line (at 7.62 5.08 180) (length 1.27)
+ (name "NC" (effects (font (size 1.27 1.27))))
+ (number "NC" (effects (font (size 1.27 1.27)))))
+ )
+ )
+ (symbol "CONN2"
+ (pin_numbers hide) (pin_names (offset 0))
+ (in_bom yes)
+ (on_board yes)
+ (property "Reference" "J" (at -2.54 5.08 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Value" "J" (at -2.54 -5.08 0) (effects (font (size 1.27 1.27)) (justify left)))
+ (property "Footprint" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (property "Datasheet" "" (at 0 0 0) (effects (font (size 1.27 1.27)) hide))
+ (symbol "CONN2_0_1"
+ (polyline (pts (xy -3.81 -3.81) (xy -3.81 3.81))
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (circle (center -2.54 -2.54) (radius 1.27)
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ (circle (center -2.54 2.54) (radius 1.27)
+ (stroke (width 0.254) (type default)) (fill (type none)))
+ )
+ (symbol "CONN2_1_1"
+ (pin passive line (at -2.54 -2.54 0) (length 1.27)
+ (name "~" (effects (font (size 1.27 1.27))))
+ (number "1" (effects (font (size 1.27 1.27)))))
+ (pin passive line (at -2.54 2.54 0) (length 1.27)
+ (name "~" (effects (font (size 1.27 1.27))))
+ (number "2" (effects (font (size 1.27 1.27)))))
+ )
+ )
+)
diff --git a/loop-detector/loop-detector-kicad/sym-lib-table b/loop-detector/loop-detector-kicad/sym-lib-table
new file mode 100644
index 0000000..55f1de1
--- /dev/null
+++ b/loop-detector/loop-detector-kicad/sym-lib-table
@@ -0,0 +1,4 @@
+(sym_lib_table
+ (version 7)
+ (lib (name "loopdet")(type "KiCad")(uri "${KIPRJMOD}/loopdet.kicad_sym")(options "")(descr "Loop detector custom symbols"))
+)
diff --git a/loop-detector/loop-detector-principle.html b/loop-detector/loop-detector-principle.html
new file mode 100644
index 0000000..1b51247
--- /dev/null
+++ b/loop-detector/loop-detector-principle.html
@@ -0,0 +1,474 @@
+
+
+
+环路车检器：检测方法推荐 + 原理图
+
+
+
+
+
+
+
+
+
+
diff --git a/memory/2026-08-21.md b/memory/2026-08-21.md
new file mode 100644
index 0000000..e66024a
--- /dev/null
+++ b/memory/2026-08-21.md
@@ -0,0 +1,38 @@
+# 2026-08-21 工作日志
+
+## 环路车检器方案 + 原理图
+
+- 老大咨询环路车检器检测方法选型与原理图绘制
+- 输出：检测方法对比（LC振荡+频率计数 主推 / PLL 高灵敏 / 电桥 不推荐 / 多频扫频 抗变频器干扰旗舰）+ LC振荡频率计数方案完整原理图
+- 文件：`/root/.openclaw/workspace/loop-detector/`
+ - `loop-detector-principle.html`（源文件，含图1方法对比 + 图2原理图）
+ - `fig1-methods.svg/.png`、`fig2-schematic.svg/.png`
+ - `inline_svg.py`（SVG 样式内联转换脚本，librsvg 不支持 CSS 变量）
+- 关键设计点：匹配变压器隔离耦合、谐振 20~150kHz、周期法测频、基准频率自适应抗温漂、光耦隔离输出、回差阈值
+
+## 服务器安装 KiCad
+
+- **KiCad 7.0.11** 安装完成（apt 官方源，35 个包，库占 363MB）
+- 组件：kicad / kicad-cli / eeschema / pcbnew，符号库+封装库完整
+- 无 GPU：3D 查看器软渲染慢，原理图/PCB 编辑不受影响
+- 图形界面走向日葵远程桌面使用
+
+## KiCad 环路车检器原理图工程（已交付）
+
+- 目录：`/root/.openclaw/workspace/loop-detector/loop-detector-kicad/`
+ - `loopdet.kicad_sym` — 自定义符号库（R/C/Q_NPN/MOS_N/LED/TVS_BI/XFMR/OPTO/COMP/MCU/RELAY_SPDT/CONN2）
+ - `loop-detector.kicad_sch` — 原理图（A3，LC振荡+频率计数完整信号链）
+ - `loop-detector.kicad_pro` — 工程文件
+ - `loop-detector.pdf` — 导出的 PDF
+ - `loop-detector-preview.png` — 预览图
+ - `gen_sch.py` — 程序化生成脚本（改参数后重跑即可）
+ - `sym-lib-table` — 工程级符号库表；全局表在 `~/.config/kicad/7.0/sym-lib-table`
+- **KiCad 7 文件格式踩坑记录（重要！）**：
+ 1. 文件头 `(kicad_sch (version 20230121) (generator eeschema)`，uuid/generator 都不带引号
+ 2. 内嵌 lib_symbols 符号名必须带库前缀（`"loopdet:C"`），与 lib_id 一致才能解析
+ 3. pin 必须带电气/图形类型：`(pin passive line (at ...) (length ...) (name "~" ...) (number "1" ...))`
+ 4. symbol 实例必须有 `(instances (project ... (path ... (reference ...) (unit 1))))` 块
+ 5. 网络标签是 `(label "VCC" (at ...) (effects ...) (uuid ...))`，不是 net_label
+ 6. 顶层文本是 `(text "内容" (at ...) ...)`，字符串前置，不是 (string ...) 子块
+- 调试方法：kicad-cli sch export pdf 验证；用 top_children 拆分文件做二分测试定位解析错误
+- 经验：kicad-cli 查库表加载缺失库会段错误（t11 测试），尽量内嵌符号
diff --git a/pcb/README.md b/pcb/README.md
new file mode 100644
index 0000000..62e226f
--- /dev/null
+++ b/pcb/README.md
@@ -0,0 +1,18 @@
+# pcb/ — PCB 设计文档目录
+
+> 本目录存放 PCB 设计相关文档（原理图、布局、Gerber、评审记录等）。
+> 由硬件同事**唐磊**提交的文档统一归档于此，随 xdeSpace 每日自动同步（每天 02:30）。
+
+## 归档约定
+
+- 原理图 / 布局文件：KiCad 工程（`.kicad_sch` / `.kicad_pcb`）或嘉立创EDA 导出文件
+- 评审记录：Markdown，命名建议 `YYYY-MM-DD-主题.md`
+- 生产文件：Gerber / BOM / 坐标文件，按项目子目录存放
+
+## 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）
+
+---
+
+_维护：小德（自动归档）_