Arduino Uno Wireless Weather Station (





Introduction: Arduino Uno Wireless Weather Station (

In this Instructable I am going to show you how to build a Wireless Weather Station using Arduino

A Weather station is a device that collects data related to the weather and environment using many different sensors. We can measure many things like:

  • Temperature
  • Humidity
  • Wind
  • Barometric Pressure
  • UV index
  • Rain

Mine inspiration to create this weather station is Greg from Davis anemometer, wind speed and rain meter Arduino code copyright rights belong to him.

I'm using Arduino Uno as main board.

ESP8266 WiFi module will send data to

Weather Underground is a commercial weather service providing real-time weather information via the Internet.

I will use these sensors:

  • Temperature - Dallas DS18B20
  • Humidity, Pressure - BME280
  • UV, Solar - ML8511
  • Anenometer and wind speed - Davis 6410
  • Rain gauge - Ventus W174

Step 1: Parts

The parts needed in order to build this project are the following:

  1. Arduino Uno
  2. ESP8266
  3. BME280
  4. ML8511
  5. Davis 6410
  6. Ventus W174

Step 2: Schematic and Wiring Diagram

Step 3: PCB Arduino Uno Weather Station Shield

Design printed circuit board (PCB), I was used ,,Sprint-Layout" software.

To create this Arduino Uno weather station shield you will need:

  1. ML8511 UVB UV Rays Sensor Breakout UV Light Sensor Analog Output for Arduino Ebay
  2. Waterproof Digital Thermal Probe or Sensor DS18B20 Arduino Sensor Ebay
  3. JST-XH Kit 4Pin 2.54mm Terminal Housing PCB Header Wire Connectors Ebay
  4. Atmospheric Pressure Sensor Temperature Humidity Sensor Breakout BME280Ebay
  5. 1x ESP8266 ESP12F Ebay
  6. 1x 1k 0805 resistor
  7. 1x 120R 0805 resistor
  8. 8x 0R 1206 jumper ( resistor)
  9. copper board
  10. 2x 4.7K resistor
  11. 1x 10k resistor
  12. 1x 3mm led
  13. 1x RJ45 socket Ebay
  14. 1x 47uF electrolytic capacitor
  15. 1x 40pins header pins Ebay
  16. 1x Voltage Regulator Sot-223 Ams1117 Ams117-3.3 3.3V 1A Ebay
  17. 1x 2.54mm Pitch Switch DIP 2 Ebay

Step 4: Arduino Sensors Libraries, Manual and Other Information

1) Arduino weather station project

2) Davis 6410 anemometer manual

3) Adafruit BME280 Driver (Barometric Pressure Sensor) library

4) ML8511 UV Sensor Library

5) Arduino Library for Maxim Temperature Integrated Circuits DS18B20 DS18S20 - Please note there appears to be an issue with this series. DS1822 DS1820 MAX31820

6) Library for Dallas/Maxim 1-Wire Chips

7) Wunderground (Personal Weather Station Upload Protocol)

8) NodeMCU weather station

Step 5: Soldering PCB

Weather station shield I was ad in to Raspberry Pi case. I think it looks better.

Step 6: Installing Personal Weather Station

The location weather station is the most important part of
installation. If weather station is located under a tree or an overhang, the rainfall data measured by the station will not be correct. If you place your weather station in an alley, you could very well get a wind tunnel effect on the anemometer, resulting in erroneous wind data. Weather station should have good "fetch", or distance from any other tall object.

The standard wind measurement should be taken at 10 meters above the ground. A roof-top works the best for me.

Weather station is powered from solar panel. So it is autonomous.

The most common error in installing a weather station is associated with misplacing the thermometer sensor. Meteorologists define temperature as the temperature in shade with plenty of ventilation. When placing weather station, make sure:

  • The thermometer sensor never receives direct sunlight.
  • The thermometer receives plenty of ventilation and is not blocked from the wind.
  • If the thermometer is placed on a roof-top, make sure it is at least 1.5 meters above the roof-top.
  • If the thermometer is placed above grass, again, it should be at least 1.5 meters above the grass surface.
  • The thermometer is at least 15 meters from the nearest paved surface.

So I'm using weather shelter. I made it from PVC tube. This way, weather station can be placed in direct sunlight, with the thermometer located inside the shelter.

More information about installing weather station here

Step 7: ESP8266 AT Commands

First it need prepare ESP8266 wifi modulle. Change CWMODE into 1 = Station mode(Client) and connect ESP8266 to you WiFi router.
I'm using usb to ttl serial adapter. Its need only connect 4 wire ( +3.3V, GND TX,RX)

AT commands:




AT+CWJAP="your ssd","password"

more AT commands here

Step 8: Arduino Code

  1. Before upload code into your Arduino Uno register in to obtain a WU station ID and key/password
  2. Change this ID and key/password into your weather station Arduino code.
  • char ID [] = "xxxxxxxx"; //wunderground weather station ID
  • String PASSWORD = "xxxxxxxx"; // wunderground weather station password
  • #define DEBUG 0 // If you want debug change it from 0 to 1

I'm using 30 second loop time sending data to

25 seconds I will take to measure wind speed. Other time is for read sensor data

Step 9: Result

It is working and sending sensors data to I'm very happy ;)



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    4 Questions

    Hi There! Thanks for the incredible instructable.

    I'm working on a remote weather station that will use a GSM cell module to send data to wunderground. Do you have an estimate of how much data each update uses?

    I want to figure out what kind of refresh rate would be usable and affordable over the cellular network.


    If I am right it use about 3kB

    What did you encapsulate the UV sensor with, and did you have to
    compensate for the material you used. How well has the encapsulation
    held up, 7 months on?

    Sorry I posted this in a comment at first, then saw the "Ask Question" button.

    I was used clear plastic with silicone to encapsulate UV sensor. I can't compare UV sensor value with another UV sensor. So I can't confirm that UV sensors show data is correct.


    Hi - has anyone got Gerber files done for the board used in this article?

    Hello, as I was having issues with WiFi in your project, I had to debug WU upload a bit and it seems to me that WU upload routine in your project is not working.

    At the beginning of the code you have definition for WU:
    char server [] = "";
    char WEBPAGE [] = "GET /weatherstation/updateweatherstation.php?";

    ...but it is not used in the code below. Instead of this there is manual initialization:
    String cmd1 = "AT+CIPSTART=\"TCP\",\"";
    cmd1 += ""; // wunderground
    cmd1 += "\",80";

    If I use provided code, it says "data send" in debug mode, but no data were sent at all.

    Can you please check whether provided scetch is up to date ? I would like to finish this great project.

    Thanks, Petr


    WiFi initialization code I used:

    #define SSID "SSID"
    #define PASS "password"

    WiFi init:
    String cmd_wifi="AT+CWJAP=\"";
    Serial.println("OK, Connected to WiFi.");


    Great Project - I'm doing something similar but with nrf24l01+ modules. What did you encapsulate the UV sensor with, and did you have to compensate for the material you used. How well has the encapsulation held up, 7 months on?

    For anyone that wants to know about re-purposing old wind and rain gagues. You need to use a meter on the pins of the cables to figure out what goes to what pin - there's some good info on sparkfun's weather station pages and a good expanation of how these devices work.

    If your wind / rain gague has been outside for some time, you may need to replace the reed switches inside it, so be prepared to get your tools out and make sure you don't lose any ball bearings when dismantling things.

    P.S. Reed switches are made of glass so don't try to bend the wires without a holding the wire near to the body with a pair of fine nosed pliers.

    I have some problems to connect the W174. Its a wireless Rainmeter but in the tutorial you connect it with cables. Can you help me to connect the Rainmeter?

    Thanks for answers!

    I was used W174 rainmeter. But you can use another. You just only neeed to conect +5V, GND and 10k pull up resistor.

    About ,,wireless" I mean that WiFi modulle ESP8266 send weather station data to internet without cable.

    Ok I think I made it. I have the W174 and it is for a wireless connection. But i made two cables to the reed lever and connectet it like you. Sorry for my bad english.


    Hi, having same issue as you had. Did you connect any power/batteries to wireless sensor VCC ? It seems that wireless version of this sensor runs from 3V power source and I am affraid what happen if I send there 5V from Arduino. Thanks, Petr

    Maybe this help you

    Untitled Sketch_bb.png

    Put this library inside cod to work:

    #include <dht.h>

    I have all the sensors of a wireless Oregon Scientific station on my roof, but the weather station itself is "dead" and expensive to replace. Would it be possible to build your weather station with other sensors than the ones you listed? (in my cas, OS sensors). Thanks for your answer!

    Everything it is possible. but you will need figured out how connect it properly to Arduino.

    Great! I started a weather station project with Arduino + ESP8266 + Thingspeak some time ago. I'll try to use Weather Underground and use your project as inspiration.