Low-Power Wi-Fi/BLE Sensor Node Design

wrongcolor

wrongcolor

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.

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Got it. I’ve prepared a plan to build your low‑power Wi‑Fi/BLE environmental T/RH node with protected USB‑C 5 V input.
  • Add blocks: MCU module (Wi‑Fi b/g/n + BLE 5.x), digital T/RH sensor, USB‑C receptacle, protected power path (reverse/OVP/UVLO/OCP), 5 V→3.3 V buck, ESD/TVS, programming header, button/LED, passives.
  • Power: implement USB‑C CC; add eFuse/load‑switch protection; pick a low‑Iq buck with 25% current margin and account for minimum‑load; add bulk/decoupling.
  • Connectivity: I2C with pull‑ups; MCU boot/programming; optional USB D+/D−; clear net/power rail labels; RF antenna keepout.
  • Integrate/wire, run ERC/parts checks, verify footprints, add USB low‑cap TVS (<1 pF/line), then start AutoLayout.
Click Start on the plan bar to begin. Quick choices before we proceed:
  1. MCU family preference (ESP32‑C3 vs ESP32‑S3), or should I choose?
  2. Sensor class (ultra‑low‑power SHT4x vs high‑accuracy class)?
  3. Use USB data for firmware/CDC, or power‑only?
Choose ESP32-S3
Choose SHT40
Use USB data
Find ESP32-S3 part
Find SHT40 sensor
  • Generic Inductor
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  • Generic Resistor
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