[
  {
    "type": "pcb_board",
    "pcb_board_id": "pcb_board_1",
    "width": 20,
    "height": 15,
    "thickness": 1.6,
    "center": { "x": 10, "y": 7.5 },
    "outline": [
      { "x": 2, "y": 3 },
      { "x": 18, "y": 3 },
      { "x": 18, "y": 7 },
      { "x": 20, "y": 7 },
      { "x": 10, "y": 15 },
      { "x": 0, "y": 7 },
      { "x": 2, "y": 7 }
    ]
  },
  {
    "type": "pcb_plated_hole",
    "pcb_plated_hole_id": "pcb_plated_hole_1",
    "shape": "circle",
    "outer_diameter": 2.0,
    "hole_diameter": 1.0,
    "x": 5,
    "y": 5,
    "layers": ["top", "bottom"]
  },
  {
    "type": "pcb_plated_hole",
    "pcb_plated_hole_id": "pcb_plated_hole_2",
    "shape": "circle",
    "outer_diameter": 2.5,
    "hole_diameter": 1.5,
    "x": 15,
    "y": 5,
    "layers": ["top", "bottom"]
  },
  {
    "type": "pcb_plated_hole",
    "pcb_plated_hole_id": "pcb_plated_hole_3",
    "shape": "circle",
    "outer_diameter": 3.0,
    "hole_diameter": 2.0,
    "x": 10,
    "y": 10,
    "layers": ["top", "bottom"]
  }
]