Temperature and Humidity Sensor Design

1:10

Addressing user complaint.

Interpreting user requests.

Resolving PCB visibility issues.

Deciding on user requests.

Formulating a plan for user requests.

Preparing to respond to user inquiry.

I’ll refactor the schematic to visible, classical wiring, clear the red ERC issues, and make sure parts appear in PCB; then set 4‑layer rules and run Auto‑Layout.

Replace most portals with explicit wires and clear net labels; tidy groupings.
Fix ERC, ensure every part has a valid footprint, and sync so components show in PCB.
Configure 4‑layer roles, RF keep‑out, and selector-based rules (power/clock/vias).
Group USB‑C + VBUS protection; cluster charger/buck/load‑switch; CH340E near USB‑C; keep INMP441 away from power; microSD at edge. Run Auto‑Layout and review DRC.

Note: an “empty” PCB view is typically caused by missing footprints or unsynced schematic; this plan fixes both.

Click Start on the plan bar and I’ll execute these steps.

Plan

Goal

Refactor the schematic for the Careful Silver Tricorder project by replacing net portals with explicit wires and clear net labels, resolving ERC red concerns, and ensuring that all components have assigned footprints so they appear on the PCB. Then, prepare the PCB layout with a 4-layer stackup, defined layout rules (including RF keep-out restrictions), and use Auto-Layout with appropriate component grouping and routing.

Implementation plan

Schematic Refactoring
1. Replace most net portals with explicit wires and add clear net labels to all connections.
2. Verify and add any missing reference nets (e.g., for VBUS, SYS, 3V3, I2S_WS, SD_SCK, EN, and GND) and group related signal labels.
3. Run ERC and address red alert warnings by validating connections and ensuring all net labels match component pins.
Footprint and ERC/DRC Synchronization
1. Confirm that all schematic components (U1 ESP32-WROOM-32D, U7 INMP441, J1 microSD socket, U3 CH340E, etc.) have valid assigned footprints.
2. Synchronize the schematic to the PCB layout so that all components are visible.
PCB Layout Preparation
1. Set up a 4-layer PCB stackup, assigning proper roles to each layer (Top, Inner1, Inner2, Bottom).
2. Define PCB rules including trace width, spacing, specific rules for power and clock nets, and RF keep-out areas (especially around U1 antenna areas).
3. Apply guidelines for grouping: cluster USB-C with VBUS protection, place CH340E near USB-C, cluster U4/U5/U6 for power management, and properly position INMP441 and microSD for signal integrity and accessibility.
Auto-Layout & Review
1. Run the Auto-Layout tool to place and route components according to the defined rules and grouping plan.
2. Review the layout for clearance, routing conflicts, and manufacturability.
Addressing the Empty PCB View
1. Verify that all components in the schematic have valid footprints linked to the PCB layout.
2. Ensure schematic-to-PCB synchronization is complete; fix any missing component or footprint associations that result in an empty PCB view.

Success criteria

All red ERC concerns are resolved and explicit wiring is visible in the schematic.
Every component has a valid footprint and appears in the PCB layout.
The PCB stackup is properly configured as a 4-layer board with designated RF keep-out areas.
Auto-Layout completes with all parts placed and routed without errors, ensuring manufacturability and reliable operation.

Ask why schematic looks messy

Ask about red review issues

Ask why PCB is empty

Ask how to sync to PCB

Ask how to reduce portals

154 days

Started implementing a plan

# Goal

- Refactor the schematic for the Careful Silver Tricorder project by replacing net portals with explicit wires and clear net labels, resolving ERC red concerns, and ensuring that all components have assigned footprints so they appear on the PCB. Then, prepare the PCB layout with a 4-layer stackup, defined layout rules (including RF keep-out restrictions), and use Auto-Layout with appropriate component grouping and routing.

# Implementation plan

1. Schematic Refactoring

1. Replace most net portals with explicit wires and add clear net labels to all connections.

2. Verify and add any missing reference nets (e.g., for VBUS, SYS, 3V3, I2S_WS, SD_SCK, EN, and GND) and group related signal labels.

3. Run ERC and address red alert warnings by validating connections and ensuring all net labels match component pins.

2. Footprint and ERC/DRC Synchronization

1. Confirm that all schematic components (U1 ESP32-WROOM-32D, U7 INMP441, J1 microSD socket, U3 CH340E, etc.) have valid assigned footprints.

2. Synchronize the schematic to the PCB layout so that all components are visible.

3. PCB Layout Preparation

1. Set up a 4-layer PCB stackup, assigning proper roles to each layer (Top, Inner1, Inner2, Bottom).

2. Define PCB rules including trace width, spacing, specific rules for power and clock nets, and RF keep-out areas (especially around U1 antenna areas).

3. Apply guidelines for grouping: cluster USB-C with VBUS protection, place CH340E near USB-C, cluster U4/U5/U6 for power management, and properly position INMP441 and microSD for signal integrity and accessibility.

4. Auto-Layout & Review

1. Run the Auto-Layout tool to place and route components according to the defined rules and grouping plan.

2. Review the layout for clearance, routing conflicts, and manufacturability.

5. Addressing the Empty PCB View

1. Verify that all components in the schematic have valid footprints linked to the PCB layout.

2. Ensure schematic-to-PCB synchronization is complete; fix any missing component or footprint associations that result in an empty PCB view.

# Success criteria

- All red ERC concerns are resolved and explicit wiring is visible in the schematic.

- Every component has a valid footprint and appears in the PCB layout.

- The PCB stackup is properly configured as a 4-layer board with designated RF keep-out areas.

- Auto-Layout completes with all parts placed and routed without errors, ensuring manufacturability and reliable operation.

154 days

Stopped due to a problem. Please try again.

U1 IO21 - J1 DAT0

U1 IO25 - J1 CD/DAT3

U4 OUT - U5 VIN

U7 SCK - U1 IO14

U1 EN - R3 P1

J2 CC2 - R2 P1

U1 IO23 - J1 CMD

J2 DB+ - U3 UD+

J2 CC1 - R1 P1

U7 SD - U1 IO32

U6 PDT - U1 3.3V

U7 WS - U1 IO15

U1 IO19 - J1 CLK

U1 IO0 - R4 P1

U6 PDT - U1 3.3V

F1 P2 - U9 IN

J2 DB- - U3 UD-

U1 IO0 - R4 P1

J3 PIN1 - U4 BAT

J2 DB- - U3 UD-

U1 EN - R3 P1

U7 L/R - GND GND

U1 IO2 - LED2 A

J2 DB+ - U3 UD+

U6 PDT - U1 3.3V

TP_SYS

TP_I2S_WS

TP_3V3

TP_VBUS

Reviews

Ground
A common return path for electric current. Commonly known as ground.
jharwinbarrozo
20.5M
Net Portal
Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
jharwinbarrozo
43.0M
Power Net Portal
Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
jharwinbarrozo
11.4M
Generic Resistor
A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Capacitor
A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Inductor
A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
jharwinbarrozo
15.8k
Terminal
An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
natarius
RMCF0805JT47K0
General Purpose Thick Film Standard Power and High-Power Chip Resistor 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film Features: - RMCF – standard power ratings - RMCP – high power ratings - Nickel barrier terminations standard - Power derating from 100% at 70ºC to zero at +155ºC - RoHS compliant, REACH compliant, and halogen free - AEC-Q200 compliant
jharwinbarrozo
1.2M
875105359001
10 µF 16 V Aluminum - Polymer Capacitors Radial, Can - SMD 30mOhm 2000 Hrs @ 105°C #commonpartslibrary #capacitor #aluminumpolymer #radialcan
jharwinbarrozo
1.2M
CTL1206FYW1T
Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric)
jharwinbarrozo
1.1M

Project Name

Careful Silver Tricorder

Description

ESP32 I2S Audio Logger With Advanced USB-C VBUS Protection and Extensive Test Points

Properties

System Ar…itecture

graph TD subgraph USB-C & Power USBC(USB-C Connector) CC1([CC1 5.1kΩ pull-down]) CC2([CC2 5.1kΩ pull-down]) ESD_DN([ESD Protection D+/D-]) USBC -- VBUS --> BQ(BQ24074) USBC -- GND --> BQ USBC -- D+ --> CH340E USBC -- D- --> CH340E USBC -- CC1 --> CC1 USBC -- CC2 --> CC2 end subgraph VBUS Protection Chain J2((USB-C VBUS)) PTC[PTC Fuse] TVS[Bidirectional TVS (<1pF)] EFuse[eFuse] U4IN(BQ24074 IN) J2 --> PTC --> TVS --> EFuse --> U4IN end subgraph Test-Point Subsystems TP_VBUS[Test Point: VBUS] TP_SYS[Test Point: SYS] TP_3V3[Test Point: 3.3V] TP_I2SWS[Test Point: I2S_WS] TP_SDSCK[Test Point: SD_SCK] TP_EN[Test Point: EN] TP_GND[Test Point: GND] end

RF Keep-Out Area

To be defined by layout for ESP32 and I2S audio lines, ensure no copper pours or traces except required signals. Refer to ESP32 datasheet for recommended keep-out around chip/antenna and sensitive I2S lines.

ERC/DRC status

Latest ERC and DRC results retrieved for review verification.

Operating Voltage

3.3

Connectivity

WiFi, Bluetooth, USB

Power Tr…nization

USB-C_IN → [VBUS Protection: PTC (F1), TVS (U8), eFuse (U9)] → BQ24074 (U4) → [SYS rail, Battery] → TPS560430 (U5) Buck → 3.3V Rail → Loads (ESP32, Peripherals, Logic, Test Points). Group protection elements (F1, U8, U9) with J2 and U4 input; group SYS and battery power with U5 and down-stream 3.3V loads (U1, U3, U7, LED2, etc.). Separate digital rails and test points for PCB layout guidance. RF keep-out for ESP32 and sensitive I2S/Audio traces as defined.

Power R…rements

USB, Battery

Board Stackup

Standard 4 Layer

Software

Arduino

Inductor…n Margin

Inductor saturation current (Isat) must be ≥ 1.2× regulator peak inductor current. Note: Select inductor so Isat ≥ 1.2 × I_peak with ripple current 20–40% of Iout for TPS560430 buck output.

Domain

Consumer Electronics

Charge C…t Target

Target charge current for BQ24074 (U4). Note: Set based on battery, USB source, and safe ratings for protection circuit; typical 500–1000 mA for single-cell Li-ion.

Pricing & Availability

Distributor	Qty 1
Arrow	$7.65–$14.37
Digi-Key	$9.26–$12.65
LCSC	$17.13
Mouser	$15.08
TME	$7.33
Verical	$8.67–$14.71

Controls

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heixiaopengyou / Careful Silver Tricorder

Schematic

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