IntermediateSensors and IoT
ESP32 Wi-Fi Weather Station
Read temperature, humidity, and pressure with a BME280, then serve a small live dashboard from the ESP32.
Parts from the database
- ESP32-WROOM-32 Ć 1Use on a development board
- BME280 Ć 1Temperature, humidity, and pressure sensor
- SSD1306 Ć 1Optional small OLED display controller
Other supplies
- ESP32 development boardCommon build supply
- BME280 breakout explicitly marked 3.3 V compatibleCommon build supply
- USB power supplyCommon build supply
- jumper wiresCommon build supply
- optional SSD1306 OLED breakoutCommon build supply
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Connections
- BME280 VIN to 3V3, GND to GND, SDA to GPIO 21 and SCL to GPIO 22 on a classic ESP32 DevKit.
- If using SSD1306 too, connect its SDA/SCL to the same bus; verify the two devices have different IĀ²C addresses.
- Do not connect 5 V pull-ups to ESP32 I/O.
Build steps
- Install Adafruit BME280 and Unified Sensor libraries; test the sensor example over USB first.
- Set the sensor address (usually 0x76 or 0x77) based on the breakout's SDO jumper.
- Add Wi-Fi credentials locally in the sketch and start the ESP32 web server.
- Open the displayed local IP address on a device on the same network; refresh and compare with the serial output.
Software and firmware setup
Firmware is required, but a complete combined web-server sketch is not included yet. Bring up the BME280 readout on the ESP32 first, then add a local web-server handler that reports the latest readings. Keep Wi-Fi credentials in a local, uncommitted copy of the sketch.
Test your build
The page should show live sensor readings and refresh without requiring a cloud account. Expect indoor pressure/weather trends, not a certified forecast.
Troubleshooting
- If begin() fails, try address 0x76 then 0x77 and check the module label.
- If the ESP32 never joins Wi-Fi, verify 2.4 GHz network support and the SSID/password.
- If the browser cannot load the page, confirm the phone/computer is on the same local network.
Safety and limitations
Use a 3.3 V-compatible sensor breakout and keep Wi-Fi credentials out of public source code. Do not treat hobby readings as weather warnings.
Manufacturer and platform documentation
Community Notes for This Project
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