USB-C Wi-Fi/Bluetooth Sensor Node
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.
81 days
1:38
Planning the project.
Focusing on low power requirements.
Addressing component mentions.
Following tool priorities.
Checking knowledge base.
Crafting the knowledge queries.
I’ll create your low‑power USB‑C (5 V) Wi‑Fi/BLE environmental T/RH node. Here’s the plan:
- Add core components: dual‑radio Wi‑Fi/BLE MCU, digital T/RH sensor, USB‑C Receptacle, antenna placeholder.
- Power input: USB‑C sink CC terminations, reverse/OVP/UVLO/OCP (eFuse/ideal‑diode), 5 V→3.3 V buck, ESD on VBUS/CC.
- Support passives: decoupling; I2C pull‑ups 4.7k Resistor respecting 400 pF bus limit.
- Connect nets: power rails, I2C, required boot/program pins; set properties.
- Layout prep: RF antenna keepout/ground clearance; place decoupling at pins; run ERC/DRC and availability checks.
Click Start to run the plan, or let me know if you want any changes.
Plan
- Design a low‑power environmental temperature and humidity sensor node powered by USB‑C (5 V) with integrated dual‑radio Wi‑Fi (802.11 b/g/n) + BLE 5.x connectivity and a digital T/RH sensor. The design will include robust USB‑C sink input protection (reverse polarity, OVP, UVLO, OCP) and support 0.5–3 A sources for consumer use.
#Implementation plan
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Core Component Integration
- Select and add a dual‑radio Wi‑Fi/BLE MCU (e.g., ESP32 or equivalent) to the schematic.
- Select and add a digital T/RH sensor (e.g., Si7021 or SHTC3) and configure its I²C connections to the MCU.
- Add an RF antenna (chip, PCB, or modular placeholder) ensuring required clearance for RF integrity.
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USB‑C Power Input & Protection Circuit
- Add a USB‑C receptacle with CC terminations to the schematic.
- Implement a USB‑C sink circuit including reverse polarity protection using a diode or eFuse system.
- Integrate overvoltage (OVP), undervoltage lockout (UVLO), and overcurrent protection (OCP) protection hardware suited for 0.5–3 A input capability.
- Place relevant decoupling (input/output capacitors) and ESD protection on the VBUS and CC lines.
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Power Regulation
- Add a 5 V to 3.3 V buck converter circuit for powering the MCU and sensor, ensuring proper input and output capacitor support.
- Insert required supporting passives (decoupling capacitors near MCU and sensor, I²C pull‑up resistors of 4.7kΩ with appropriate bus capacitance limits).
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Schematic Connections and PCB Considerations
- Connect the MCU, sensor, USB‑C circuitry, and buck converter ensuring proper net connections (e.g., I2C buses, power rails).
- Enforce proper naming and properties for nets to support ERC/DRC verification.
- Define RF antenna keepout zones and ground clearances in PCB layout rules.
#Success criteria
- A complete schematic featuring a dual‑radio Wi‑Fi/BLE MCU, digital T/RH sensor, robust USB‑C sink with protection circuitry, and a buck converter that meets all outlined specifications.
- Successful ERC/DRC checks and establishment of clear RF guidelines for antenna placement and decoupling best practices on the PCB.
Choose MCU module
Pick T/RH sensor
Select USB-C protection
Choose 3.3V regulator
USB-C CC resistors
81 days
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