How to Build a DIY IoT Weather Station with an ESP8266 and Arduino

Building your own IoT weather station with an ESP8266 and Arduino is a fun electronics project that allows you to get hands-on experience with IoT and microcontroller programming. Here is a step-by-step guide on how I built my own and got it working.

Gather the Required Components

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

Optional components:

For power, I used a 5V USB phone charger along with a power bank to make the station portable.

Assemble the Circuit

Here are the steps I followed to assemble the circuit on a breadboard:

  1. Connect the Arduino's 5V and GND pins to power the components.

  2. Connect the digital output of the rain sensor to a digital pin on the Arduino.

  3. Connect the DHT22 sensor's data pin to a digital pin per its requirements.

  4. Connect the SDA/SCL pins of the BMP180 to the Arduino's I2C pins.

  5. Connect the photoresistor and anode resistor to an analog input pin.

  6. Connect the ESP8266's CH_PD and RST pins to enable communication.

  7. Connect the TX/RX pins between the ESP8266 and Arduino for software serial.

Install Required Libraries

The Arduino will need the following libraries installed to compile the code:

Install these through the Arduino IDE's Library Manager.

Write the Arduino Sketch

The Arduino sketch has the following key functions:

Create a Backend to Receive the Data

To store and display the weather data sent by the Arduino, you need a backend service with a REST API.

Popular options include:

For my project, I used Node-RED to create a simple MQTT broker and dashboard to display the received data.

Power and Enclose the Project

With the circuit complete and code working, the final steps are:

And that's it! With all the steps complete, you now have your own fully functional IoT weather station! Feel free to customize it by adding more sensors and capabilities.