Build an arduino powered weather station
Build an Arduino-powered weather station to measure temperature, humidity, and air pressure using sensors, display readings, and learn basic coding and electronics.
About this activity
Build an Arduino-powered weather station to measure temperature, humidity, and air pressure using sensors, display readings, and learn basic coding and electronics.
What you need
Step by step
- 1
Step 1
Clear a clean workspace and lay out all materials so you can find each part easily.
- 2
Step 2
Plug the Arduino into the computer using the USB cable to power it and allow code uploads.
- 3
Step 3
Press the BME280 sensor and the I2C display gently into the breadboard so their pins are accessible.
- 4
Step 4
Connect the BME280 to the Arduino by wiring VCC to 5V GND to GND SDA to A4 and SCL to A5 on the Arduino.
- 5
Step 5
Connect the I2C display to the Arduino by wiring VCC to 5V GND to GND SDA to A4 and SCL to A5 so the display shares the I2C lines.
- 6
Step 6
Open the Arduino IDE on your computer and select Arduino Uno and the correct serial port from the Tools menu.
- 7
Step 7
Install the libraries Adafruit BME280 Adafruit Unified Sensor Adafruit GFX and Adafruit SSD1306 using the Library Manager in the Arduino IDE.
- 8
Step 8
Open or paste a weather station sketch that reads the BME280 and writes to the I2C display into the Arduino IDE.
- 9
Step 9
Check the sketch for I2C addresses and display settings and change any address numbers to match your modules if needed.
- 10
Step 10
Click Upload in the Arduino IDE to compile the sketch and send it to the Arduino and wait until the upload completes.
- 11
Step 11
Open the Serial Monitor and look at the display to verify temperature humidity and pressure readings appear and look reasonable.
- 12
Step 12
Share a photo and short description of your finished Arduino-powered weather station on DIY.org
Fun facts
How do I build an Arduino-powered weather station for kids?
Start by mounting an Arduino (Uno or Nano) and a BME280 sensor on a breadboard. Connect power (3.3–5V), ground, SDA and SCL to the Arduino I2C pins. Install Adafruit Unified Sensor and BME280 libraries, upload a simple sketch to read temperature, humidity and pressure, and print to Serial Monitor. Add an I2C OLED or 16x2 LCD for live display. Test, calibrate if needed, then move to a protoboard and enclosure. Turn off power before rewiring.
What materials do I need to make an Arduino weather station?
You'll need an Arduino Uno or Nano, a BME280 (temp/humidity/pressure) sensor or separate DHT22 and BMP280, jumper wires, a breadboard, USB cable, and an I2C OLED display or 16x2 LCD with I2C adapter. Optional items: SD card module for logging, RTC clock, battery pack or portable power, soldering tools, small enclosure, and basic hand tools (wire stripper, pliers). Libraries and example code are freely available online.
What ages is building an Arduino weather station suitable for?
Children aged 8–11 can participate with close adult help for wiring and coding; ages 12–15 can complete most steps with supervision; teens 16+ can work more independently. Adapt tasks by letting younger kids assemble parts and read displays while older kids write and modify Arduino code, log data, and design enclosures. Prior experience helps but isn’t required—use guided tutorials and pair programming to build skills and confidence.
What are the benefits and safety tips for this project?
This project teaches coding, electronics, data literacy, and scientific observation while encouraging troubleshooting and math skills. For safety, supervise soldering and hot tools, keep small parts away from very young children, disconnect power before wiring, and use safe power sources. Teach gentle component handling and basic electrical safety. Variations to extend learning include Wi‑Fi data upload, solar power, or adding wind and rain sensors.
Watch & Learn
Need help?
What can I use if I can't find the BME280 or the I2C display?
If you can't find a BME280, substitute a BMP280 for temperature and pressure (no humidity) or a DHT22 for temperature and humidity but you'll need to rewire the sensor to a digital pin, install the corresponding library, and update the sketch's sensor-reading lines accordingly.
What should I do if the display shows nothing or the sensor readings are wrong after uploading the sketch?
If readings don't appear or look wrong, first check that SDA is wired to A4 and SCL to A5 with a common GND and 5V, run an I2C scanner sketch to confirm the module address, ensure the Adafruit BME280/SSD1306/GFX libraries are installed, and then update the I2C address numbers in the sketch before uploading again.
How can I adapt this activity for different age groups?
For younger children have an adult plug in the Arduino and pre-insert the BME280 and I2C display while the child labels wires and watches the Serial Monitor, for middle-schoolers let them wire VCC/GND/SDA/SCL and install libraries with guidance, and for teens assign changing I2C addresses in the sketch and adding simple data-logging code as a challenge.
How can we extend or personalize the weather station after it works?
To extend the project add an SD card module and RTC to log timestamped readings, or replace the Uno with an ESP8266/ESP32 and modify the sketch and libraries to send temperature, humidity, and pressure to ThingSpeak or display graphs on the I2C screen, then mount the setup in a 3D-printed or weatherproof case.