A compact weather station PCB built around an ESP32-WROOM-32 module reads temperature, humidity, pressure, light, and display data from four I2C sensors. The board is powered from a USB 5V rail with a fuse, regulated down to 3.3V, and all sensors share SDA/SCL with pull-up resistors.
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Use I2C pull-up resistors (4.7k) to 3.3V on SDA and SCL
Power the ESP32 and all sensors from a regulated 3.3V rail decoupled with 100nF and 10uF capacitors
Protect the USB input with a 500mA fuse before the LDO regulator
Label the ESP32 and each sensor with clear reference designators and labels for readability
Use this schematic pattern for any ESP32-based sensor hub project with multiple I2C devices sharing a 3.3V rail, including weather stations, environmental monitors, and smart home nodes.