Temperature and Humidity Sensor Node Design
continue
Thought for 3 sec
I’ll inspect the current schematic and project docs, run design checks, then fix any schematic issues I find before summarizing what remains for layout.
Worked for 52 sec
I’m blocked because the account has no available ACUs, so I can’t continue AI layout actions right now.
Completed this session:
- Verified the schematic/ERC state: no open errors or warnings were reported.
- Set up the PCB as a 45 mm × 30 mm rounded rectangle with a standard 4-layer stackup and 0.5 mm board keepout.
- Confirmed the board area is workable, though routing may be tight around the ESP32/power section.
Remaining work:
- Place components with ESP32 antenna keepout, USB-C edge placement, compact buck/eFuse layout, and isolated SHT41 placement.
- Route the PCB.
- Run DRC and airwire checks.
- Fix any routing or layout violations before manufacturing export.
Review placement constraints
Check ACU balance
Run layout checks
Estimate board size
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Board Bring-Up Plan
Pre-Power Checks
- Inspect USB-C connector, eFuse, buck regulator, and ESP32 module soldering.
- Check resistance from VBUS_RAW to GND and 3V3 to GND; confirm no hard short.
- Confirm CC1 and CC2 each measure about 5.1 kΩ to GND.
First Power
- Power from a current-limited 5 V bench supply or USB current meter.
- Verify VBUS_RAW at J1 and VBUS_PROT at U3 OUT.
- Verify 3V3 rail at U1 3V3 and U2 VDD.
- Confirm eFuse does not current-limit during idle boot.
Programming
- Connect USB-C to a development machine.
- Hold BOOT, tap RESET, release BOOT if manual download mode is needed.
- Flash the firmware starter using PlatformIO.
- Confirm serial console over native USB.
Functional Tests
- Read SHT41 over I2C and verify plausible T/RH values.
- Verify Wi-Fi association and reconnect behavior.
- Verify BLE provisioning behavior when implemented.
- Confirm status LED current and firmware duty cycle.
Power/Signal Validation
- Scope 3V3 during Wi-Fi transmit; verify no brownout dips.
- Check buck switch node for excessive ringing.
- Check USB D+/D− enumeration reliability.
- Validate sensor thermal offset with enclosure installed.
Pass Criteria
- 3V3 remains within regulator tolerance under Wi-Fi bursts.
- USB enumeration and firmware upload are reliable.
- Sensor readings are stable and not heat-biased by board placement.
- No abnormal heating in U3/U4/L1 during continuous Wi-Fi operation.
Pre-Power Checks
First Power
Programming
Functional Tests
Power/Signal Validation
Pass Criteria
