{
  "revision": "R5",
  "notation": "PCB.J1:n is an actual numbered PCB pad; other names are module silkscreen roles or explicitly assigned harness labels, never fabricated PCB references.",
  "nets": [
    { "name": "CELL+", "endpoints": ["BATT.+", "CHG.BAT+"] },
    { "name": "CELL-", "endpoints": ["BATT.-", "CHG.BAT-"] },
    {
      "name": "OUT+",
      "endpoints": [
        "CHG.OUT+",
        "PCB.J1:1",
        "PCB.SW@(34,45)",
        "BUTTON_PLUG.OUT+",
        "SW_REMOTE.contact_A"
      ]
    },
    { "name": "VSW", "endpoints": ["PCB.J1:2", "BOOST.VIN+", "ESP.5V"] },
    {
      "name": "GND",
      "endpoints": [
        "CHG.OUT-",
        "PCB.J1:3",
        "PCB.J1:6",
        "BOOST.VIN-",
        "BOOST.VOUT-",
        "ESP.GND",
        "DRV.GND"
      ]
    },
    { "name": "GATE", "endpoints": ["PCB.J1:4", "ESP.LATCH"] },
    { "name": "SENSE", "endpoints": ["PCB.J1:5", "ESP.BUTTON_ADC"] },
    {
      "name": "BTN_N",
      "endpoints": [
        "PCB.SW@(40.5,45)",
        "BUTTON_PLUG.BTN_N",
        "SW_REMOTE.contact_B"
      ]
    },
    { "name": "+12V", "endpoints": ["BOOST.VOUT+", "LED.+12V"] }
  ],
  "board_variants": {
    "C3": {
      "primary": true,
      "LATCH": 3,
      "BUTTON_ADC": 4,
      "G": 5,
      "R": 6,
      "B": 7,
      "WW": 10,
      "CW": 20,
      "optional_BATTERY_ADC": 1
    },
    "S3": {
      "primary": false,
      "LATCH": 9,
      "BUTTON_ADC": 8,
      "G": 5,
      "R": 4,
      "B": 6,
      "WW": 10,
      "CW": 11,
      "optional_BATTERY_ADC": 1
    }
  },
  "channels": [
    {
      "channel": "G",
      "Q": "Q1",
      "series": "Rg1",
      "pulldown": "Rp1",
      "C3_GPIO": 5,
      "S3_GPIO": 5
    },
    {
      "channel": "R",
      "Q": "Q2",
      "series": "Rg2",
      "pulldown": "Rp2",
      "C3_GPIO": 6,
      "S3_GPIO": 4
    },
    {
      "channel": "B",
      "Q": "Q3",
      "series": "Rg3",
      "pulldown": "Rp3",
      "C3_GPIO": 7,
      "S3_GPIO": 6
    },
    {
      "channel": "WW",
      "Q": "Q4",
      "series": "Rg4",
      "pulldown": "Rp4",
      "C3_GPIO": 10,
      "S3_GPIO": 10
    },
    {
      "channel": "CW",
      "Q": "Q5",
      "series": "Rg5",
      "pulldown": "Rp5",
      "C3_GPIO": 20,
      "S3_GPIO": 11
    }
  ],
  "channel_topology": {
    "PWM": "ESP channel GPIO -> Rg.a (100ohm)",
    "GATE": "Rg.b -> Q.G -> Rp.a (10k)",
    "RETURN": "Q.S -> Rp.b -> DRV.GND",
    "LED_RETURN": "Q.D -> LED channel pad"
  },
  "harness": {
    "button": "Two signal conductors, matched keyed plug/socket, strain relief both ends. PCB solder points selected by net and coordinates, not SW pad number alone.",
    "power": "Keep high-current VSW/+12V/return wiring short; do not share thin switch pigtail as LED supply",
    "routing": "Final case-coordinate wire paths are illustrative; measure length against dry assembly with service slack"
  },
  "forbidden_connections": [
    "CHG.BAT- to CHG.OUT- bypasses protection",
    "+12V to any ESP or latch PCB pad",
    "BATT.+ directly to ESP.3V3",
    "SW_REMOTE across GATE and GND",
    "PCBSW matching four-leg switch installed without resolving pad contact conflict"
  ]
}