Temperature and Humidity Sensor Design

heixiaopengyou

heixiaopengyou

the schematic should be a classical connection, visible, not just end points because from the review section, i see a lot of red concerns. moreover, why am i not seeing anything in the pcb section?
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60 days

flux

1:10

General
Chat History
Project
Plan

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.
60 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.

60 days

Stopping...

Show Plan

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U1 IO21 - J1 DAT0
U1 IO25 - J1 CD/DAT3
U4 OUT - U5 VIN
U1
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
U3
U7 WS - U1 IO15
U1 IO19 - J1 CLK
U1 IO0 - R4 P1
U6 PDT - U1 3.3V
F1 P2 - U9 IN
F1 P2 - U9 IN
J2 DB- - U3 UD-
TP_SYS
U8
U1 IO0 - R4 P1
J3 PIN1 - U4 BAT
J2 DB- - U3 UD-
J2
TP_I2S_WS
U1 EN - R3 P1
U7 L/R - GND GND
U1 IO2 - LED2 A
J2 DB+ - U3 UD+
U6 PDT - U1 3.3V
TP_3V3
TP_VBUS
U2
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Inspect

Careful Silver Tricorder

Careful Silver Tricorder
Description

Created
Last updated by heixiaopengyou
1 Contributor(s)
heixiaopengyou

Controls

Properties

System Architecture
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 V
Connectivity
WiFi, Bluetooth, USB
Power Tree Organization
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 Requirements
USB, Battery
Board Stackup
Standard 4 Layer
Software
Arduino
Inductor Saturation 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 Current 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. mA

Availability & Pricing

DistributorQty 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

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