Switch to 4-layer board, finish routing

buzzer_pcb/buzzer_pcb.kicad_pro

@@ -250,7 +250,20 @@
     "equivalence_files": []
   },
   "erc": {
-    "erc_exclusions": [],
+    "erc_exclusions": [
+      [
+        "lib_symbol_mismatch|1536700|1689100|bd17b751-5d46-49b7-9916-98862c41ac33|00000000-0000-0000-0000-000000000000|||",
+        "Geändert, wegen Power-Pins"
+      ],
+      [
+        "lib_symbol_mismatch|1905000|1485900|2fd53a97-4206-4f33-acb6-3c2cab9e8b1e|00000000-0000-0000-0000-000000000000|||",
+        ""
+      ],
+      [
+        "power_pin_not_driven|1435100|1549400|b607964f-b3ff-4433-be21-510bdb4653a0|00000000-0000-0000-0000-000000000000|/19263075-2e14-4c1c-b140-be1cece82e7d|/19263075-2e14-4c1c-b140-be1cece82e7d|",
+        "Wird über FB versorgt"
+      ]
+    ],
     "meta": {
       "version": 0
     },
@@ -465,6 +478,7 @@
       "single_global_label": "ignore",
       "unannotated": "error",
       "unconnected_wire_endpoint": "warning",
+      "undefined_netclass": "error",
       "unit_value_mismatch": "error",
       "unresolved_variable": "error",
       "wire_dangling": "error"

buzzer_pcb/buzzer_pcb.kicad_sch

@@ -5864,6 +5864,12 @@
 		(color 0 0 0 0)
 		(uuid "128959b9-b85f-423e-bcce-6e35d4b8fe21")
 	)
+	(junction
+		(at 46.99 19.05)
+		(diameter 0)
+		(color 0 0 0 0)
+		(uuid "1488d7e9-5025-4b6c-9529-17e87f16f7f7")
+	)
 	(junction
 		(at 137.16 168.91)
 		(diameter 0)
@@ -6062,6 +6068,12 @@
 		(color 0 0 0 0)
 		(uuid "b7fb4268-dc41-44e6-8655-4af1793f3a45")
 	)
+	(junction
+		(at 36.83 26.67)
+		(diameter 0)
+		(color 0 0 0 0)
+		(uuid "b89f260c-ff8c-474a-9211-3f978f506a9b")
+	)
 	(junction
 		(at 135.89 173.99)
 		(diameter 0)
@@ -6678,6 +6690,16 @@
 		)
 		(uuid "4ddffc87-7d98-4efb-ae5b-8ac35817cc3e")
 	)
+	(wire
+		(pts
+			(xy 36.83 26.67) (xy 46.99 26.67)
+		)
+		(stroke
+			(width 0)
+			(type default)
+		)
+		(uuid "4ef4d265-6c3c-47ce-b69e-991f46e08cec")
+	)
 	(wire
 		(pts
 			(xy 25.4 142.24) (xy 25.4 144.78)
@@ -7050,7 +7072,7 @@
 	)
 	(wire
 		(pts
-			(xy 21.59 26.67) (xy 46.99 26.67)
+			(xy 21.59 26.67) (xy 36.83 26.67)
 		)
 		(stroke
 			(width 0)
@@ -7368,6 +7390,16 @@
 		)
 		(uuid "be64ff02-a924-456a-a685-ca0998c793a1")
 	)
+	(wire
+		(pts
+			(xy 36.83 19.05) (xy 46.99 19.05)
+		)
+		(stroke
+			(width 0)
+			(type default)
+		)
+		(uuid "bfa8bea6-70fb-4896-9bfe-cd07d052da60")
+	)
 	(wire
 		(pts
 			(xy 241.3 132.08) (xy 259.08 132.08)
@@ -12353,6 +12385,76 @@
 			)
 		)
 	)
+	(symbol
+		(lib_id "Device:C")
+		(at 36.83 22.86 0)
+		(mirror y)
+		(unit 1)
+		(exclude_from_sim no)
+		(in_bom yes)
+		(on_board yes)
+		(dnp no)
+		(uuid "9ffc24a2-2f8a-4929-ab21-e26ae0091194")
+		(property "Reference" "C9"
+			(at 33.02 21.5899 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(justify left)
+			)
+		)
+		(property "Value" "100n"
+			(at 33.02 24.1299 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(justify left)
+			)
+		)
+		(property "Footprint" "Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder"
+			(at 35.8648 26.67 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(hide yes)
+			)
+		)
+		(property "Datasheet" "~"
+			(at 36.83 22.86 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(hide yes)
+			)
+		)
+		(property "Description" "Unpolarized capacitor"
+			(at 36.83 22.86 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(hide yes)
+			)
+		)
+		(pin "1"
+			(uuid "549d70fd-f8ff-4bef-98ab-904865548785")
+		)
+		(pin "2"
+			(uuid "ee331b33-c489-4d1f-94b5-449f30fda848")
+		)
+		(instances
+			(project "buzzer_pcb"
+				(path "/19263075-2e14-4c1c-b140-be1cece82e7d"
+					(reference "C9")
+					(unit 1)
+				)
+			)
+		)
+	)
 	(symbol
 		(lib_id "Device:C")
 		(at 223.52 154.94 0)