{
  "title": "Vaibik USB-powered breadboard prototype",
  "board_reference": "nice!nano v2 front view, USB at top",
  "firmware_target": "promicro_nrf52840/nrf52840/uf2",
  "grid": "30 rows, A-E and F-J form separate five-contact groups per row; power rails unused",
  "parts": {
    "TX.PTT": "C21",
    "TX.GND": "C23",
    "TX.CLK": "C25",
    "TX.DAT": "C26",
    "TX.3V3": "G24",
    "MIC.3V": "J6",
    "MIC.GND": "J7",
    "MIC.SEL": "J8",
    "MIC.CLK": "J9",
    "MIC.DAT": "J10",
    "SW.A1": "E13",
    "SW.A2": "F13",
    "SW.B1": "E15",
    "SW.B2": "F15"
  },
  "jumpers": [
    {
      "net": "PTT",
      "from": "A21",
      "to": "A13"
    },
    {
      "net": "GND",
      "from": "A23",
      "to": "G7"
    },
    {
      "net": "GND",
      "from": "H7",
      "to": "H8"
    },
    {
      "net": "GND",
      "from": "F7",
      "to": "J15"
    },
    {
      "net": "3V3",
      "from": "J24",
      "to": "F6"
    },
    {
      "net": "CLK",
      "from": "A25",
      "to": "F9"
    },
    {
      "net": "DAT",
      "from": "A26",
      "to": "F10"
    }
  ],
  "switch": "normally open; E13/F13 internally common and E15/F15 internally common in shown orientation; diagonal E13/F15 wired; press connects PTT to GND",
  "verified": "All five expected nets separate with button released. Press connects only PTT to GND."
}