Temperature and Humidity Sensor Node Design
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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Plan
- Design a consumer USB-C powered low-power environmental sensor node using an ultra-low-power MCU with integrated dual 2.4 GHz Wi-Fi 802.11 b/g/n and BLE 5.x, paired with a digital temperature/humidity sensor. The design must incorporate a robust USB-C 5 V default sink power input featuring reverse polarity protection, overvoltage protection (OVP), undervoltage lockout (UVLO), and overcurrent protection (OCP), and be compatible with USB-C sources delivering from 0.5 A to 3 A.
#Implementation plan
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Project Initialization and Architecture
- Update the project description of 'Fragile Bronze Carbonite Freezer' to reflect the environmental sensor node design.
- Define system architecture arranging three primary subsystems: wireless MCU, digital temperature/humidity sensor, and protected USB-C power input.
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Adding and Configuring Core Components
- Select and add an ultra-low-power MCU with dual-radio capabilities (e.g., an ESP32-C3 module or equivalent) to address Wi-Fi 802.11 b/g/n and BLE 5.x connectivity.
- Select and add a digital temperature/humidity sensor (e.g., an SHT3x series sensor) to the schematic.
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USB-C Power Input and Protection Path
- Add a USB-C connector configured for a default 5 V sink.
- Design and add a robust power path that includes:
- Reverse polarity protection (using an appropriate MOSFET-based solution or diode).
- Overvoltage protection (e.g., TVS diode or dedicated OVP circuit).
- Undervoltage lockout (using a UVLO circuit or monitor integrated in the power management IC).
- Overcurrent protection (using a resettable fuse or PTC resistor).
- Ensure the power circuitry is planned to handle USB-C sources ranging from 0.5 A to 3 A.
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Integration and Interconnections
- Connect the MCU power input to the filtered and protected 5 V USB-C supply.
- Interface the digital sensor with the MCU via the appropriate digital communication bus (e.g., I²C), adding necessary pull-up resistors and bypass capacitors.
- Make sure additional decoupling and filtering components are placed around the MCU and sensor for reliable operation.
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Schematic Final Review
- Review connections for the power protection subsystem to ensure consumer-use robustness.
- Verify that interconnections between the MCU, sensor, and USB-C power path are correctly implemented.
#Success criteria
- A completed schematic that integrates an ultra-low-power MCU (ESPs with dual-radio), digital temperature/humidity sensor, and a robust USB-C power input with required protective features.
- Verified connectivity between power, sensor, and wireless subsystems ensuring consumer-grade reliability for a wide range of USB-C source currents (0.5 A to 3 A).
Add ESD protection
Use SHT41 sensor
Set up PCB
a day
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