Temperature and Humidity Sensor Node Design
Thought
Work done
- Created and named the project USB-C WiFi BLE Environmental Sensor and updated the project description.
- Verified an existing schematic already contains the main design blocks: ESP32-S3-WROOM-1-N16R8, SHT31-DIS, USB-C receptacle, TPS25200 5V eFuse/protection, AP2112K-3.3 regulator, UART/debug header, decoupling capacitors, I2C pull-ups, CC pull-downs, mounting holes, and power/reset/boot support.
- Confirmed key nets are present:
VBUS_USB,5V_PROTECTED,3V3,GND,I2C_SDA,I2C_SCL,USB_DP,USB_DN, UART, reset, boot, and eFuse fault/enable/current-limit nets. - Added component role metadata for passives, ICs, connector, power protection, regulator, sensor, MCU, and debug header to support review and placement intent.
- Created the Project Specification project file with architecture, implementation choices, firmware pin map, and layout requirements.
- Set PCB outline to 90 mm × 60 mm, rounded corners, compact consumer form factor, and 4-layer stackup with a ground reference suitable for RF/EMI.
- Applied baseline manufacturable layout rules: 0.20 mm default trace width, 0.15 mm minimum trace width, 0.15 mm keepout, and 0.50 mm board inset margin.
- Checked datasheets for the protection/regulator/RF-module assumptions: TPS25200 provides UVLO/OVLO/OVP clamp/OCP/reverse blocking while disabled; AP2112K-3.3 supports a 600 mA 3.3 V rail; ESP32-S3-WROOM-1 has antenna keepout placement requirements.
- ✅ Schematic includes USB-C 5 V input, CC pull-downs, protected 5 V path, 3.3 V regulation, MCU, sensor, I2C, debug, and support passives.
- ✅ Dual-radio MCU and digital T/RH sensor are integrated and interconnected in the schematic.
- ⚠️ PCB layout setup is partially complete: board size, stackup, and baseline rules are set, but final component placement/routing/review could not be completed.
- ⚠️ Final production review is not complete; ERC/DRC/airwire review and routing verification still remain.
- Place components on the 90 mm × 60 mm PCB with the ESP32-S3 antenna at a board edge and ~5 mm antenna overhang/keepout, USB-C at an accessible edge, power components clustered near USB-C, and SHT31 away from heat sources.
- Route the board, using wide copper/traces for the 5 V protected path and short decoupling loops.
- Run final ERC/DRC/airwire review and resolve any remaining issues before manufacturing export.
Thought for 2 mins 56 sec
Placed 27 component(s): U1, C3, C6, C7, H3, H2, J1, R5, C5, R2, H4, U4, C2, R3, R1, C4, U3, R7, J2, H1, R9, U2, R6, R8, R4, C8, C1
Thought for 3 sec
Work done
- Built the schematic for the USB-C powered Wi‑Fi/BLE temperature/humidity node: ESP32‑S3 module, SHT31 sensor, USB‑C default-sink input, TPS25200 protection, AP2112 3.3V regulation, decoupling, I²C pull-ups, boot/reset, USB data, and UART debug access.
- Configured a compact 50 mm × 50 mm 4-layer PCB setup and placed all components with USB‑C at the edge, ESP32 antenna facing outward, sensor away from the power section, and mounting holes in the corners.
- Added documentation: Project Specification, Firmware Pin Map, and Design Review Results.
- ✅ Complete protected USB-C power-path schematic and 3.3V rail are present.
- ✅ Dual-radio MCU, digital T/RH sensor, support passives, and debug/programming connections are integrated.
- ⚠️ PCB placement is complete, but final routed PCB production readiness is not complete yet.
- ⚠️ Final checks found remaining PCB routing airwires and one copper-overlap item that must be resolved before fabrication.
Route the PCB traces, inspect the copper-overlap item, then rerun final checks before manufacturing export.
Route remaining airwires
Inspect copper overlap
Run final review
Check antenna placement
Export production files
