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ESP32_Serial_Swiss_Army_Knife/hardware/PCB/serial-carrier.kicad_sch
T
Commander1024 c257158ada Record Accepted PCB Placement And Fit 
Align component groups, repair affected routing, and add preservation
audits.
Assign the confirmed U2 footprint and update pull-ups to 2 kΩ across
design files.
Document user acceptance, switch to an A3 worksheet, and refresh PCB
exports.
2026-09-22 10:28:08 +02:00

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(kicad_sch (version 20250114) (generator "eeschema") (uuid "c86e0d56-4290-5f2b-b790-14926c8cdeea") (paper "A3")
(title_block (title "ESP32 Serial Swiss Army Knife - Module Carrier") (date "2026-09-20") (rev "A0 DRAFT") (comment 1 "Not fabrication-ready: provisional module footprints and male RS-232 mapping"))
(lib_symbols (symbol "Carrier:HW678_N16R8" (pin_names (offset 0.762)) (in_bom yes) (on_board yes)
(property "Reference" "U" (at 0 34.29 0) (effects (font (size 1.27 1.27)) ))
(property "Value" "HW678_N16R8" (at 0 31.75 0) (effects (font (size 1.27 1.27)) ))
(property "Footprint" "Carrier:HW678_2x22_Provisional" (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" "HW-678 V0.0.0 / N16R8 carrier interface; project numbering; onboard USB/regulator retained" (at 0 0 0) (effects (font (size 1.27 1.27)) (hide yes)))
(symbol "HW678_N16R8_0_1" (rectangle (start -17.78 29.21) (end 17.78 -29.21) (stroke (width 0.254) (type default)) (fill (type background))))
(symbol "HW678_N16R8_1_1"
(pin power_out line (at -22.86 26.67 0) (length 5.08) (name "3V3" (effects (font (size 1.016 1.016)) )) (number "1" (effects (font (size 1.016 1.016)) )))
(pin passive line (at -22.86 24.13 0) (length 5.08) (name "3V3" (effects (font (size 1.016 1.016)) )) (number "2" (effects (font (size 1.016 1.016)) )))
(pin input line (at -22.86 21.59 0) (length 5.08) (name "EN" (effects (font (size 1.016 1.016)) )) (number "3" (effects (font (size 1.016 1.016)) )))
(pin input line (at -22.86 19.05 0) (length 5.08) (name "GPIO4" (effects (font (size 1.016 1.016)) )) (number "4" (effects (font (size 1.016 1.016)) )))
(pin input line (at -22.86 16.51 0) (length 5.08) (name "GPIO5" (effects (font (size 1.016 1.016)) )) (number "5" (effects (font (size 1.016 1.016)) )))
(pin input line (at -22.86 13.97 0) (length 5.08) (name "GPIO6" (effects (font (size 1.016 1.016)) )) (number "6" (effects (font (size 1.016 1.016)) )))
(pin output line (at -22.86 11.43 0) (length 5.08) (name "GPIO7" (effects (font (size 1.016 1.016)) )) (number "7" (effects (font (size 1.016 1.016)) )))
(pin output line (at -22.86 8.89 0) (length 5.08) (name "GPIO15" (effects (font (size 1.016 1.016)) )) (number "8" (effects (font (size 1.016 1.016)) )))
(pin input line (at -22.86 6.35 0) (length 5.08) (name "GPIO16" (effects (font (size 1.016 1.016)) )) (number "9" (effects (font (size 1.016 1.016)) )))
(pin output line (at -22.86 3.81 0) (length 5.08) (name "GPIO17" (effects (font (size 1.016 1.016)) )) (number "10" (effects (font (size 1.016 1.016)) )))
(pin input line (at -22.86 1.27 0) (length 5.08) (name "GPIO18" (effects (font (size 1.016 1.016)) )) (number "11" (effects (font (size 1.016 1.016)) )))
(pin input line (at -22.86 -1.27 0) (length 5.08) (name "GPIO8" (effects (font (size 1.016 1.016)) )) (number "12" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at -22.86 -3.81 0) (length 5.08) (name "GPIO3" (effects (font (size 1.016 1.016)) )) (number "13" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at -22.86 -6.35 0) (length 5.08) (name "GPIO46" (effects (font (size 1.016 1.016)) )) (number "14" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at -22.86 -8.89 0) (length 5.08) (name "GPIO9" (effects (font (size 1.016 1.016)) )) (number "15" (effects (font (size 1.016 1.016)) )))
(pin input line (at -22.86 -11.43 0) (length 5.08) (name "GPIO10" (effects (font (size 1.016 1.016)) )) (number "16" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at -22.86 -13.97 0) (length 5.08) (name "GPIO11" (effects (font (size 1.016 1.016)) )) (number "17" (effects (font (size 1.016 1.016)) )))
(pin output line (at -22.86 -16.51 0) (length 5.08) (name "GPIO12" (effects (font (size 1.016 1.016)) )) (number "18" (effects (font (size 1.016 1.016)) )))
(pin input line (at -22.86 -19.05 0) (length 5.08) (name "GPIO13" (effects (font (size 1.016 1.016)) )) (number "19" (effects (font (size 1.016 1.016)) )))
(pin input line (at -22.86 -21.59 0) (length 5.08) (name "GPIO14" (effects (font (size 1.016 1.016)) )) (number "20" (effects (font (size 1.016 1.016)) )))
(pin passive line (at -22.86 -24.13 0) (length 5.08) (name "5V" (effects (font (size 1.016 1.016)) )) (number "21" (effects (font (size 1.016 1.016)) )))
(pin power_out line (at -22.86 -26.67 0) (length 5.08) (name "GND" (effects (font (size 1.016 1.016)) )) (number "22" (effects (font (size 1.016 1.016)) )))
(pin passive line (at 22.86 26.67 180) (length 5.08) (name "GND" (effects (font (size 1.016 1.016)) )) (number "23" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at 22.86 24.13 180) (length 5.08) (name "GPIO43" (effects (font (size 1.016 1.016)) )) (number "24" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at 22.86 21.59 180) (length 5.08) (name "GPIO44" (effects (font (size 1.016 1.016)) )) (number "25" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at 22.86 19.05 180) (length 5.08) (name "GPIO1" (effects (font (size 1.016 1.016)) )) (number "26" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at 22.86 16.51 180) (length 5.08) (name "GPIO2" (effects (font (size 1.016 1.016)) )) (number "27" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at 22.86 13.97 180) (length 5.08) (name "GPIO42" (effects (font (size 1.016 1.016)) )) (number "28" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at 22.86 11.43 180) (length 5.08) (name "GPIO41" (effects (font (size 1.016 1.016)) )) (number "29" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at 22.86 8.89 180) (length 5.08) (name "GPIO40" (effects (font (size 1.016 1.016)) )) (number "30" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at 22.86 6.35 180) (length 5.08) (name "GPIO39" (effects (font (size 1.016 1.016)) )) (number "31" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at 22.86 3.81 180) (length 5.08) (name "GPIO38" (effects (font (size 1.016 1.016)) )) (number "32" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at 22.86 1.27 180) (length 5.08) (name "GPIO37" (effects (font (size 1.016 1.016)) )) (number "33" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at 22.86 -1.27 180) (length 5.08) (name "GPIO36" (effects (font (size 1.016 1.016)) )) (number "34" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at 22.86 -3.81 180) (length 5.08) (name "GPIO35" (effects (font (size 1.016 1.016)) )) (number "35" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at 22.86 -6.35 180) (length 5.08) (name "GPIO0" (effects (font (size 1.016 1.016)) )) (number "36" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at 22.86 -8.89 180) (length 5.08) (name "GPIO45" (effects (font (size 1.016 1.016)) )) (number "37" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at 22.86 -11.43 180) (length 5.08) (name "GPIO48" (effects (font (size 1.016 1.016)) )) (number "38" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at 22.86 -13.97 180) (length 5.08) (name "GPIO47" (effects (font (size 1.016 1.016)) )) (number "39" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at 22.86 -16.51 180) (length 5.08) (name "GPIO21" (effects (font (size 1.016 1.016)) )) (number "40" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at 22.86 -19.05 180) (length 5.08) (name "GPIO20" (effects (font (size 1.016 1.016)) )) (number "41" (effects (font (size 1.016 1.016)) )))
(pin bidirectional line (at 22.86 -21.59 180) (length 5.08) (name "GPIO19" (effects (font (size 1.016 1.016)) )) (number "42" (effects (font (size 1.016 1.016)) )))
(pin passive line (at 22.86 -24.13 180) (length 5.08) (name "GND" (effects (font (size 1.016 1.016)) )) (number "43" (effects (font (size 1.016 1.016)) )))
(pin passive line (at 22.86 -26.67 180) (length 5.08) (name "GND" (effects (font (size 1.016 1.016)) )) (number "44" (effects (font (size 1.016 1.016)) )))
)
)
(symbol "Carrier:MAX3243_Module_Reference" (pin_names (offset 0.762)) (in_bom yes) (on_board yes)
(property "Reference" "U" (at 0 22.86 0) (effects (font (size 1.27 1.27)) ))
(property "Value" "MAX3243_Module_Reference" (at 0 20.32 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" "Adafruit male 6253 intended; physical numbering from published female 5988 CAD, VERIFY MALE" (at 0 0 0) (effects (font (size 1.27 1.27)) (hide yes)))
(symbol "MAX3243_Module_Reference_0_1" (rectangle (start -15.24 17.78) (end 15.24 -17.78) (stroke (width 0.254) (type default)) (fill (type background))))
(symbol "MAX3243_Module_Reference_1_1"
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(pin input line (at -20.32 -3.81 0) (length 5.08) (name "RTS" (effects (font (size 1.016 1.016)) )) (number "8" (effects (font (size 1.016 1.016)) )))
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(pin input line (at -20.32 -13.97 0) (length 5.08) (name "OFF_N" (effects (font (size 1.016 1.016)) )) (number "12" (effects (font (size 1.016 1.016)) )))
)
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(symbol "Carrier:OLED_I2C_26mm" (pin_names (offset 0.762)) (in_bom yes) (on_board yes)
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(symbol "OLED_I2C_26mm_0_1" (rectangle (start -10.16 7.62) (end 10.16 -7.62) (stroke (width 0.254) (type default)) (fill (type background))))
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(property "Footprint" "Button_Switch_THT:SW_TH_Tactile_Omron_B3F-100x" (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" "Normally open contact; footprint duplicates pads 1 and 2 for internally common terminal pairs" (at 0 0 0) (effects (font (size 1.27 1.27)) (hide yes)))
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)
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(property "Status" "Header geometry nominal; outline/antenna clearance pending" (at 95.25 109.22 0) (effects (font (size 1.27 1.27)) (hide yes)))
(property "Pin_numbering" "Left 1-22; right 23-44; both top-to-bottom, antenna up" (at 95.25 109.22 0) (effects (font (size 1.27 1.27)) (hide yes)))
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(pin "12" (uuid "35b6d88b-5907-5977-aadc-eeb22f38e80a"))
(pin "13" (uuid "351de5e5-c93c-5146-ab20-04e74cf929e8"))
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(pin "2" (uuid "6bbc82d1-8cfb-5fd5-832c-8df2775a89c9"))
(instances (project "serial-carrier" (path "/c86e0d56-4290-5f2b-b790-14926c8cdeea" (reference "SW1") (unit 1)))))
(wire (pts (xy 322.58 104.14) (xy 309.88 104.14)) (stroke (width 0) (type default)) (uuid "5b028b05-8a36-55db-aaf9-9b382e614203"))
(label "BTN_PREVIOUS" (at 309.88 104.14 0) (effects (font (size 1.016 1.016)) (justify left bottom)) (uuid "5e45c195-3cf8-5a7b-93e1-84b53b154824"))
(wire (pts (xy 332.74 104.14) (xy 345.44 104.14)) (stroke (width 0) (type default)) (uuid "4036fecd-dbe2-5786-a9b9-dce5b14fbf7f"))
(label "GND" (at 345.44 104.14 0) (effects (font (size 1.016 1.016)) (justify left bottom)) (uuid "d3b7a7cc-4c33-5080-b795-7892d393bb53"))
(text "Previous / back" (at 302.26 110.49 0) (effects (font (size 1.016 1.016)) (justify left top)) (uuid "d84df288-be52-5de4-899d-bf29ba78f4f2"))
(symbol (lib_id "Carrier:R") (at 327.66 124.46 0) (unit 1) (in_bom yes) (on_board yes) (dnp no) (uuid "405055c0-35ab-5334-ad4d-30d45c5ef6f2")
(property "Reference" "R2" (at 327.66 118.364 0) (effects (font (size 1.27 1.27)) ))
(property "Value" "2k 1%" (at 327.66 120.904 0) (effects (font (size 1.27 1.27)) ))
(property "Footprint" "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal" (at 327.66 124.46 0) (effects (font (size 1.27 1.27)) (hide yes)))
(property "Datasheet" "" (at 327.66 124.46 0) (effects (font (size 1.27 1.27)) (hide yes)))
(property "Rating" "Purchased metal-film 1%; design at least 0.125 W; actual MPN/wattage unspecified" (at 327.66 124.46 0) (effects (font (size 1.27 1.27)) (hide yes)))
(pin "1" (uuid "c23dbef2-d61d-56fa-a158-bb9912ef48ac"))
(pin "2" (uuid "f60eb205-60d1-5d8f-ac84-ca04f66e7106"))
(instances (project "serial-carrier" (path "/c86e0d56-4290-5f2b-b790-14926c8cdeea" (reference "R2") (unit 1)))))
(wire (pts (xy 322.58 124.46) (xy 309.88 124.46)) (stroke (width 0) (type default)) (uuid "eb68b8eb-dbe6-5133-8089-e9de01165396"))
(label "+3V3" (at 309.88 124.46 0) (effects (font (size 1.016 1.016)) (justify left bottom)) (uuid "5bef1a07-0985-5bb8-9b36-ed0c9e2c82ab"))
(wire (pts (xy 332.74 124.46) (xy 345.44 124.46)) (stroke (width 0) (type default)) (uuid "b3b13ef4-4203-52d8-889b-70534a4a1b28"))
(label "BTN_SELECT" (at 345.44 124.46 0) (effects (font (size 1.016 1.016)) (justify left bottom)) (uuid "e8d69aad-ffba-5ace-a414-b44ff7528289"))
(symbol (lib_id "Carrier:SW_NO") (at 327.66 139.7 0) (unit 1) (in_bom yes) (on_board yes) (dnp no) (uuid "c522a716-55a4-584d-a12e-ab135b4c08eb")
(property "Reference" "SW2" (at 327.66 132.08 0) (effects (font (size 1.27 1.27)) ))
(property "Value" "B3F-1000" (at 327.66 134.62 0) (effects (font (size 1.27 1.27)) ))
(property "Footprint" "Button_Switch_THT:SW_TH_Tactile_Omron_B3F-100x" (at 327.66 139.7 0) (effects (font (size 1.27 1.27)) (hide yes)))
(property "Datasheet" "" (at 327.66 139.7 0) (effects (font (size 1.27 1.27)) (hide yes)))
(property "Manufacturer" "Omron" (at 327.66 139.7 0) (effects (font (size 1.27 1.27)) (hide yes)))
(property "MPN" "B3F-1000" (at 327.66 139.7 0) (effects (font (size 1.27 1.27)) (hide yes)))
(property "Function" "Select / confirm" (at 327.66 139.7 0) (effects (font (size 1.27 1.27)) (hide yes)))
(property "Procurement" "User reports purchased" (at 327.66 139.7 0) (effects (font (size 1.27 1.27)) (hide yes)))
(pin "1" (uuid "19bafbc6-666f-5e53-a4ef-265057c6dc8a"))
(pin "2" (uuid "9e3f47ba-92ac-5503-9d87-6b5590a70ccb"))
(instances (project "serial-carrier" (path "/c86e0d56-4290-5f2b-b790-14926c8cdeea" (reference "SW2") (unit 1)))))
(wire (pts (xy 322.58 139.7) (xy 309.88 139.7)) (stroke (width 0) (type default)) (uuid "05f5a256-5e68-53ae-a051-81eab3a14d4d"))
(label "BTN_SELECT" (at 309.88 139.7 0) (effects (font (size 1.016 1.016)) (justify left bottom)) (uuid "a90ee2dc-ed10-5bb9-9082-99cdbfeac4c9"))
(wire (pts (xy 332.74 139.7) (xy 345.44 139.7)) (stroke (width 0) (type default)) (uuid "04211708-439f-5d65-a5c6-21cf89318109"))
(label "GND" (at 345.44 139.7 0) (effects (font (size 1.016 1.016)) (justify left bottom)) (uuid "7f92da60-87bd-5c50-afc0-4046d0c67767"))
(text "Select / confirm" (at 302.26 146.05 0) (effects (font (size 1.016 1.016)) (justify left top)) (uuid "c28f2639-f392-552b-858e-b031aabc8c0a"))
(symbol (lib_id "Carrier:R") (at 327.66 160.02 0) (unit 1) (in_bom yes) (on_board yes) (dnp no) (uuid "78f9a74f-5d91-5687-b50e-68176333df23")
(property "Reference" "R3" (at 327.66 153.924 0) (effects (font (size 1.27 1.27)) ))
(property "Value" "2k 1%" (at 327.66 156.464 0) (effects (font (size 1.27 1.27)) ))
(property "Footprint" "Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal" (at 327.66 160.02 0) (effects (font (size 1.27 1.27)) (hide yes)))
(property "Datasheet" "" (at 327.66 160.02 0) (effects (font (size 1.27 1.27)) (hide yes)))
(property "Rating" "Purchased metal-film 1%; design at least 0.125 W; actual MPN/wattage unspecified" (at 327.66 160.02 0) (effects (font (size 1.27 1.27)) (hide yes)))
(pin "1" (uuid "d871ee2e-bc82-5f23-a436-7b7ab74b73a9"))
(pin "2" (uuid "96528b84-ba49-5f38-8445-b6ca2cadc93b"))
(instances (project "serial-carrier" (path "/c86e0d56-4290-5f2b-b790-14926c8cdeea" (reference "R3") (unit 1)))))
(wire (pts (xy 322.58 160.02) (xy 309.88 160.02)) (stroke (width 0) (type default)) (uuid "ad7355d6-b196-5b55-b518-28095d4cd010"))
(label "+3V3" (at 309.88 160.02 0) (effects (font (size 1.016 1.016)) (justify left bottom)) (uuid "08ba6112-d16a-5597-b3f3-8794ed1ea849"))
(wire (pts (xy 332.74 160.02) (xy 345.44 160.02)) (stroke (width 0) (type default)) (uuid "7a2af359-d23d-5777-9193-ff203ac538d8"))
(label "BTN_NEXT" (at 345.44 160.02 0) (effects (font (size 1.016 1.016)) (justify left bottom)) (uuid "5011a121-e49f-5298-8cc1-2998dfa40f7d"))
(symbol (lib_id "Carrier:SW_NO") (at 327.66 175.26 0) (unit 1) (in_bom yes) (on_board yes) (dnp no) (uuid "35caa6bb-42a6-512c-848c-f1e4457aa97f")
(property "Reference" "SW3" (at 327.66 167.64 0) (effects (font (size 1.27 1.27)) ))
(property "Value" "B3F-1000" (at 327.66 170.18 0) (effects (font (size 1.27 1.27)) ))
(property "Footprint" "Button_Switch_THT:SW_TH_Tactile_Omron_B3F-100x" (at 327.66 175.26 0) (effects (font (size 1.27 1.27)) (hide yes)))
(property "Datasheet" "" (at 327.66 175.26 0) (effects (font (size 1.27 1.27)) (hide yes)))
(property "Manufacturer" "Omron" (at 327.66 175.26 0) (effects (font (size 1.27 1.27)) (hide yes)))
(property "MPN" "B3F-1000" (at 327.66 175.26 0) (effects (font (size 1.27 1.27)) (hide yes)))
(property "Function" "Next" (at 327.66 175.26 0) (effects (font (size 1.27 1.27)) (hide yes)))
(property "Procurement" "User reports purchased" (at 327.66 175.26 0) (effects (font (size 1.27 1.27)) (hide yes)))
(pin "1" (uuid "85beb3b7-e16f-5450-ba94-5711245a7b25"))
(pin "2" (uuid "300c4196-eb91-5e58-a9aa-c84b8f7c4219"))
(instances (project "serial-carrier" (path "/c86e0d56-4290-5f2b-b790-14926c8cdeea" (reference "SW3") (unit 1)))))
(wire (pts (xy 322.58 175.26) (xy 309.88 175.26)) (stroke (width 0) (type default)) (uuid "899495f9-e27d-5c7f-9961-bda42dd5b5b5"))
(label "BTN_NEXT" (at 309.88 175.26 0) (effects (font (size 1.016 1.016)) (justify left bottom)) (uuid "4917cd5a-7d37-54f4-8139-7ae4739c44c4"))
(wire (pts (xy 332.74 175.26) (xy 345.44 175.26)) (stroke (width 0) (type default)) (uuid "f48c99dc-9974-5205-8a87-3b1278a4fdfd"))
(label "GND" (at 345.44 175.26 0) (effects (font (size 1.016 1.016)) (justify left bottom)) (uuid "3c7713ca-d8f2-53fd-8e98-6fd376e4570c"))
(text "Next" (at 302.26 181.61 0) (effects (font (size 1.016 1.016)) (justify left top)) (uuid "0db41e9e-455f-5007-82ee-b485aacda4c4"))
(text "MODULE CARRIER - INITIAL SCHEMATIC" (at 15.24 15.24 0) (effects (font (size 2.54 2.54)) (justify left top)) (uuid "81374533-4a9c-521b-8834-9fa30bb907b5"))
(text "Native KiCad 10 schematic. Named wire labels join matching nets on this sheet.\nRead hardware/PCB/README.md before layout or fabrication." (at 15.24 24.13 0) (effects (font (size 1.27 1.27)) (justify left top)) (uuid "d9d89d85-2a9c-5e76-bd60-48c81ac7f524"))
(text "U1: complete development board" (at 53.34 57.15 0) (effects (font (size 1.778 1.778)) (justify left top)) (uuid "320a8f4e-ff8b-5100-845b-dfe249b39a2e"))
(text "Antenna up / USB down: left row 1-22, right row 23-44.\nNC marks mean unused on carrier, not unused inside module." (at 53.34 64.77 0) (effects (font (size 1.016 1.016)) (justify left top)) (uuid "649df1fa-48c0-580d-aeb8-d019ffd0b61d"))
(text "U2: complete RS-232 breakout" (at 177.8 57.15 0) (effects (font (size 1.778 1.778)) (justify left top)) (uuid "5226007c-1904-547d-8ddb-008d14b83d51"))
(text "Male 6253 selected. Numbers from published 5988 female CAD.\nMale mapping user-reviewed; reference footprint assigned.\nDE-9 and charge pump are already on the module." (at 177.8 64.77 0) (effects (font (size 1.016 1.016)) (justify left top)) (uuid "9b62e7ca-695a-51af-bbbe-e7ee4ee45c08"))
(text "Controls: active-low, firmware-debounced" (at 292.1 57.15 0) (effects (font (size 1.778 1.778)) (justify left top)) (uuid "9d91985c-7375-5177-9a5e-8280e3bcaff6"))
(text "External 2k 1% pull-ups: ~1.65 mA at 3.3 V.\nChosen for B3F-1000 rated contact load; internal\npull-ups may remain enabled. Exact resistor MPN pending." (at 292.1 64.77 0) (effects (font (size 1.016 1.016)) (justify left top)) (uuid "b2dd72f5-86fc-5ce1-b09a-67a6fe9404d4"))
(text "DS1: front view GND / VCC / SCL / SDA" (at 177.8 128.27 0) (effects (font (size 1.524 1.524)) (justify left top)) (uuid "7b57748d-38ca-5712-97f9-bf6dab6dafaf"))
(text "Power at 3.3 V only. Onboard I2C pull-ups user-confirmed;\nresistance and rail unmeasured; no external pull-ups." (at 177.8 165.1 0) (effects (font (size 1.016 1.016)) (justify left top)) (uuid "fb23ec11-40f8-56c7-b78b-0da2d40e4b72"))
(text "POWER / RECOVERY\nPower only through U1's existing USB ports. No carrier 5 V input.\nU1 regulator supplies +3V3; GND pins are common on the module.\nPin 1 +3V3 and pin 22 GND model the onboard supply for ERC.\nGPIO19/20 native USB and GPIO43/44 UART0 remain onboard.\nUSB nonisolated accepted; backfeed safety not verified.\nKeep both USB connectors and reset/boot buttons accessible." (at 15.24 185.42 0) (effects (font (size 1.27 1.27)) (justify left top)) (uuid "cadf6b77-e888-5f04-b4f6-3873114844ca"))
(text "RS-232 / ELECTRICAL LIMITS\nTX/RX and modem labels are at the ESP32 logic side.\nOFF_N is active low; GPIO9 must remain open-drain.\nBreakout provides its OFF pull-up. No galvanic isolation.\nNo carrier connection to raw RS-232 voltages.\nCarrier GND, USB GND and RS-232 signal ground are common.\nNever power OLED or MAX3243 logic from 5 V." (at 152.4 185.42 0) (effects (font (size 1.27 1.27)) (justify left top)) (uuid "0f7da388-3edb-5cc3-9937-13492397a221"))
(text "USER ACCEPTANCE / EVIDENCE LIMITS\nModule mapping and visual fit accepted by user.\nB3F-1000 and 2k 1% metal-film resistors purchased.\nM3 carrier/module hardware; M2 display hardware.\nRF/power routing accepted, not qualified.\nRegulator margin and USB backfeed safety unverified.\nERC is not hardware or fabrication approval." (at 292.1 185.42 0) (effects (font (size 1.27 1.27)) (justify left top)) (uuid "1df2bd9e-fbff-5047-92a9-09f33d7cd7ac"))
)
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