Temperature and Humidity Sensor Node Design

ivanstankoff

ivanstankoff

Make me a temperature and humidity sensor node with Wifi and Bluetooth, powered by USB-C (5V) for consumer use.
It should be a low-power environmental node with a digital T/RH sensor, ultra-low-power MCU with Wi-Fi + Bluetooth (dual-radio) — 2.4 GHz 802.11 b/g/n plus BLE 5.x powered by USB-C (5 V) — USB-C receptacle 5 V default; include reverse/OVP/UVLO/OCP protection and plan for 0.5–3 A sources.

flux

I’ll create a low‑power USB‑C 5 V environmental node with a digital T/RH sensor and a dual‑radio Wi‑Fi/BLE MCU, including robust input protection sized for 0.5–3 A sources.
Plan:
  1. Add MCU, digital T/RH sensor, USB‑C receptacle, 3.3 V regulator, eFuse/load switch, and passives; include bidirectional USB data‑line TVS with capacitance below 1 pF per line.
  2. Implement USB‑C sink (CC pull‑downs), VBUS reverse/OVP/UVLO/OCP, and ESD; size power path for up to 3 A sources.
  3. Power: 5 V to 3.3 V with low quiescent current; observe minimum load requirements; decouple per ICs.
  4. RF/I/O: choose antenna type and keepouts; route I2C with pull‑ups; add programming/status.
  5. Connect nets, run ERC/DRC, and prep placement isolating switcher returns from sensor grounds to prevent ground bounce coupling.
Questions to finalize before I start:
  • Any preference for antenna (chip, PCB trace, or external connector)?
  • Target sensor accuracy (for RH/Temp) and measurement cadence?
  • Size constraints or enclosure considerations? Click Start on the plan bar when ready.
Pick specific MCU
Choose sensor part
Antenna decision
USB-C protection parts
Form factor constraints
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