pcb: J3: Add non-PoE 5V power input header

Power over Ethernet (PoE) has the disadvantage that GND is significantly
below earth. This requires that GND of a PoE-powered device is never
attached to earthed devices.

In production use cases this is no problem. The earth lines are
isolated.

Nevertheless for debugging it is sometimes useful to connect measuring
equipment like logic analyzers and oscilloscopes to the board. This is
not possible with PoE. Thus an alternative earth-based 5V power input is
useful.

2 files changed, 281 insertions, 1 deletions

diff --git a/pcb/iot-contact.kicad_sch b/pcb/iot-contact.kicad_sch
index 685e732..5b4725a 100644
--- a/pcb/iot-contact.kicad_sch
+++ b/pcb/iot-contact.kicad_sch
@@ -359,6 +359,145 @@
 				)
 			)
 		)
+		(symbol "Connector_Generic:Conn_01x02"
+			(pin_names
+				(offset 1.016) hide)
+			(exclude_from_sim no)
+			(in_bom yes)
+			(on_board yes)
+			(property "Reference" "J"
+				(at 0 2.54 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "Value" "Conn_01x02"
+				(at 0 -5.08 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "Footprint" ""
+				(at 0 0 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(hide yes)
+				)
+			)
+			(property "Datasheet" "~"
+				(at 0 0 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(hide yes)
+				)
+			)
+			(property "Description" "Generic connector, single row, 01x02, script generated (kicad-library-utils/schlib/autogen/connector/)"
+				(at 0 0 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(hide yes)
+				)
+			)
+			(property "ki_keywords" "connector"
+				(at 0 0 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(hide yes)
+				)
+			)
+			(property "ki_fp_filters" "Connector*:*_1x??_*"
+				(at 0 0 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(hide yes)
+				)
+			)
+			(symbol "Conn_01x02_1_1"
+				(rectangle
+					(start -1.27 -2.413)
+					(end 0 -2.667)
+					(stroke
+						(width 0.1524)
+						(type default)
+					)
+					(fill
+						(type none)
+					)
+				)
+				(rectangle
+					(start -1.27 0.127)
+					(end 0 -0.127)
+					(stroke
+						(width 0.1524)
+						(type default)
+					)
+					(fill
+						(type none)
+					)
+				)
+				(rectangle
+					(start -1.27 1.27)
+					(end 1.27 -3.81)
+					(stroke
+						(width 0.254)
+						(type default)
+					)
+					(fill
+						(type background)
+					)
+				)
+				(pin passive line
+					(at -5.08 0 0)
+					(length 3.81)
+					(name "Pin_1"
+						(effects
+							(font
+								(size 1.27 1.27)
+							)
+						)
+					)
+					(number "1"
+						(effects
+							(font
+								(size 1.27 1.27)
+							)
+						)
+					)
+				)
+				(pin passive line
+					(at -5.08 -2.54 0)
+					(length 3.81)
+					(name "Pin_2"
+						(effects
+							(font
+								(size 1.27 1.27)
+							)
+						)
+					)
+					(number "2"
+						(effects
+							(font
+								(size 1.27 1.27)
+							)
+						)
+					)
+				)
+			)
+		)
 		(symbol "Connector_Generic:Conn_01x04"
 			(pin_names
 				(offset 1.016) hide)
@@ -1457,6 +1596,16 @@
 	)
 	(wire
 		(pts
+			(xy 133.35 170.18) (xy 139.7 170.18)
+		)
+		(stroke
+			(width 0)
+			(type default)
+		)
+		(uuid "c8f544bb-e101-4d38-a33a-f9058d2fd9e0")
+	)
+	(wire
+		(pts
 			(xy 137.16 130.81) (xy 133.35 130.81)
 		)
 		(stroke
@@ -1467,6 +1616,16 @@
 	)
 	(wire
 		(pts
+			(xy 133.35 172.72) (xy 139.7 172.72)
+		)
+		(stroke
+			(width 0)
+			(type default)
+		)
+		(uuid "ce67f6f6-3c2a-497a-9499-3432f39f8c5e")
+	)
+	(wire
+		(pts
 			(xy 166.37 53.34) (xy 166.37 63.5)
 		)
 		(stroke
@@ -1506,6 +1665,16 @@
 		)
 		(uuid "1ae7143f-cee0-4e2f-9140-99129bd7c48f")
 	)
+	(text "external 5V power input for development\nNEVER use together with PoE!"
+		(exclude_from_sim no)
+		(at 104.648 170.942 0)
+		(effects
+			(font
+				(size 1.27 1.27)
+			)
+		)
+		(uuid "56f4af8c-1572-4497-98f2-10a81ab55e1d")
+	)
 	(symbol
 		(lib_id "Switch:SW_Push")
 		(at 142.24 130.81 0)
@@ -1811,7 +1980,7 @@
 				(hide yes)
 			)
 		)
-		(property "Description" "UART"
+		(property "Description" "3V3 UART"
 			(at 161.29 48.26 0)
 			(effects
 				(font
@@ -2021,6 +2190,75 @@
 		)
 	)
 	(symbol
+		(lib_id "Connector_Generic:Conn_01x02")
+		(at 128.27 170.18 0)
+		(mirror y)
+		(unit 1)
+		(exclude_from_sim no)
+		(in_bom yes)
+		(on_board yes)
+		(dnp no)
+		(fields_autoplaced yes)
+		(uuid "82545faa-f3c8-4796-a053-beafee983540")
+		(property "Reference" "J3"
+			(at 128.27 163.83 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+			)
+		)
+		(property "Value" "Conn_01x02"
+			(at 128.27 166.37 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+			)
+		)
+		(property "Footprint" "Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical"
+			(at 128.27 170.18 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(hide yes)
+			)
+		)
+		(property "Datasheet" "~"
+			(at 128.27 170.18 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(hide yes)
+			)
+		)
+		(property "Description" "Non-PoE 5V power input"
+			(at 128.27 170.18 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(hide yes)
+			)
+		)
+		(pin "1"
+			(uuid "5ad9f74b-eb27-4e36-b5d4-49dee1a29853")
+		)
+		(pin "2"
+			(uuid "99d89cd0-4ca4-430b-a60c-5b6f32e59f4b")
+		)
+		(instances
+			(project ""
+				(path "/5defd195-0277-4d04-9f5f-69e505c9845c"
+					(reference "J3")
+					(unit 1)
+				)
+			)
+		)
+	)
+	(symbol
 		(lib_id "power:+3V3")
 		(at 157.48 58.42 90)
 		(unit 1)
@@ -2791,6 +3029,26 @@
 				(justify left top)
 			)
 		)
+		(pin "EXT_5V" input
+			(at 139.7 172.72 180)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(justify left)
+			)
+			(uuid "11dd0a29-5492-4d6f-9acc-6ab015287d8c")
+		)
+		(pin "EXT_GND" input
+			(at 139.7 170.18 180)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(justify left)
+			)
+			(uuid "9a44079c-d24e-41f2-8229-98b9bddeee4a")
+		)
 		(instances
 			(project "iot-contact"
 				(path "/5defd195-0277-4d04-9f5f-69e505c9845c"
diff --git a/pcb/power.kicad_sch b/pcb/power.kicad_sch
index d4c47db..2fc67a5 100644
--- a/pcb/power.kicad_sch
+++ b/pcb/power.kicad_sch
@@ -5,4 +5,26 @@
 	(uuid "04efbab4-4b09-41dd-b889-e48452d150e7")
 	(paper "A4")
 	(lib_symbols)
+	(hierarchical_label "EXT_GND"
+		(shape input)
+		(at 50.8 116.84 180)
+		(effects
+			(font
+				(size 1.27 1.27)
+			)
+			(justify right)
+		)
+		(uuid "63f6c991-7d4d-49ef-849f-23837f200404")
+	)
+	(hierarchical_label "EXT_5V"
+		(shape input)
+		(at 50.8 114.3 180)
+		(effects
+			(font
+				(size 1.27 1.27)
+			)
+			(justify right)
+		)
+		(uuid "f4c611bb-4ee4-414a-8506-b9578937609d")
+	)
 )