Building your own IoT weather station with an Arduino is a great electronics project that allows you to get hands-on experience with IoT and sensor technology. With just a few inexpensive components, I can build a weather station that measures temperature, humidity, pressure, and more. This DIY IoT project is perfect for beginners looking to learn more about Arduino and IoT.


An IoT weather station is a device that uses various sensors to measure local weather conditions like temperature, humidity, and air pressure. The sensor data is then sent wirelessly over the internet to cloud platforms for logging, analysis, and visualization.

Building your own IoT weather station is an excellent way to get started with IoT projects. It teaches you the fundamentals of connecting sensors to a microcontroller, collecting sensor data, and transmitting it wirelessly. Best of all, it can be done on a budget using an Arduino and inexpensive components.

In this guide, I will show you how I built a low-cost DIY IoT weather station using an Arduino Uno, a breadboard, some basic sensors, and ESP8266 WiFi module.

Components Needed

To build the IoT weather station, you will need the following components:

In total, all these components cost around $35-$40. The Arduino Uno and ESP8266 make up the bulk of the cost. Overall, it is an inexpensive DIY IoT project.

Assembling the Circuit

With all my components gathered, it's time to assemble the circuit. This involves carefully connecting the sensors and modules to the Arduino on the breadboard using jumper wires.

Here are the steps I followed to assemble the circuit:

  1. Place the Arduino Uno in the center of the breadboard.

  2. Connect the ESP8266 WiFi module to the breadboard. This will communicate wirelessly with the Arduino.

  3. Connect the DHT11 temperature and humidity sensor. Make sure to use the 10K ohm resistors as specified in the datasheet.

  4. Connect the BMP180 pressure sensor following the pinout in the datasheet.

  5. Use LEDs and resistors to provide status indicators.

  6. Finally, connect the breadboard power supply to provide 5V power to the circuit.

I tested the connections as I went along by uploading simple Arduino programs to ensure each component functioned before moving to the next. Assembling the circuit carefully is important to avoid any wiring issues.

Coding the Arduino

With the physical hardware assembled, it's time to bring everything together with the software. This involves coding the Arduino to:

For this project, I coded the Arduino in the Arduino IDE using the C programming language.

The key functions my Arduino sketch needs are:

I tested the code incrementally as I developed it - verifying the initialization, WiFi connection, data readout, and data transmission functions one by one. Writing modular Arduino code with proper commenting made the development process easier.

Proper formatting and styling is also important for readability and maintability later on.

Viewing the Data

The last step is viewing the data collected by the IoT weather station!

For this project, I transmitted the sensor data wirelessly over WiFi to the ThingSpeak IoT platform. ThingSpeak allows you to visualize and analyze live IoT sensor data streams.

After creating a ThingSpeak channel for my weather station, I configured the ESP8266 to transmit data to it from the Arduino sketch.

Once the Arduino started collecting and transmitting sensor data, I could instantly view live graphs and visualizations of temperature, humidity, and pressure levels from anywhere on my phone or laptop through the ThingSpeak website or app.


Building a DIY IoT weather station using an Arduino and basic components was an excellent learning experience that gave me valuable hands-on practice with IoT concepts.

Some of the key lessons from this project include:

This beginner-friendly IoT project gave me the confidence to take on more advanced IoT builds in the future using the Arduino platform. The weather station also provides interesting and useful environment data that I can now track and monitor from anywhere!