Google Weather on Graphical Display With Arduino




About: An experienced manager in Hi-Tech that never gets bored with technology or life

In this project, I am using an Arduino board to show forecast of the weather from Google Weather service on a VGA screen. The display is obviously graphical one, with icons and some colorful text. It is one of those gadgets I wanted to have for some time now – A weather forecasting display that is there just like the wall clock. Yes I know you got nicer looking things on your angry-birds machine... I simply enjoy doing it myself. Had some challenges to overcome, like Arduino has only 2KB of RAM limitation, pretty small for parsing XML data…

• Current and Forecast weather information graphically displayed
• Time display from the internet, using NTP protocol
• Does not require any PC to be involved
• Indoor temperature and humidity display
• Easy to connect and assembly, only Ethernet cable and power
• Supports DHCP for network connection
• Supports both VGA screens and small 3.2" screens
• Daylight-Saving support through a user button

Some more features include change of background color between night and day for the clocks and change background color of the weather data areas depending on temperatures.

I have a newer version of this at

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Step 1: What Is Required to Build This Gadget?

1. Arduino Ethernet Pro ( or Arduino with Ethernet Shield
2. 4D Systems display (uLCD-32PT) or display adaptor (uVGA II)
3. Arduino I/O headers socket
4. 5x Jumper wires (only 4 required for operation), note the display and display adaptor have male pins and Arduino typically takes female headers.
5. 2GB or less micro-SD (only needs about 150KB)
6. Power Supply
7. Ethernet Cable
8. DHT-22 Temperature and humidity sensor (optional, only if you want indoor temp)
9. Push button (optional)
10. 2x 10K Ohm resistor (optional, only if you want indoor temp)

Also for building the gadget, you will need the following
1. FTDI board, better use 5Volts one like this one.
2. PC for programming
3. A micro-SD reader device
4. Soldering Iron

Step 2: Where to Buy?

All of the items can be purchased at Sparkfun or your favorite electronic components store. As for the display or display adaptor, they come pre-loaded with one of the firmware types SGC or GFX. It doesn't really matter which one you buy, as converting from one firmware flavor to the other is very simple task performed by a tool on the PC.

Step 3: How to Assembly?

Please read this thoroughly as there could be notes on changes that you might want to do.
1. After purchasing the goods, download software to your PC including:
a. Arduino IDE (I use version 022)
b. 4D Systems tools for programming their adaptors or displays from
c. Arduino libraries including: NewSoftwareSerial, Arduino Time Library, Ethernet Library
2. Connect your display or display adaptor to the FTDI (Vcc to 5V, GND to GND, Rx to Tx and Tx to Rx, DTR on the FTDI to Reset pin) and the FTDI to USB on your PC
3. Upload the right firmware onto the LCD using PmmC Loader tool from 4D Systems (you need the GFX version)
4. Open the 4D systems Workshop tool; open the program file in the code\4D subdirectory of the ZIP file in this publication. Follow the steps as also shown in the picture for this tool to:
a. Select the right display or adaptor model
b. Select the right COM port (the one the FTDI generates)
c. Select destination as "Flash" and not "Ram" (don't forget this!)
d. Compile and Load the program to the display/adaptor
5. Place all the necessary Arduino libraries in the right location (if do not exist already)
6. Connect your Arduino to PC
7. Edit the Arduino files to match your time zone and place
a. Edit the file NTPAndTime.cpp and change variable timeZoneSeconds to reflect the difference of your time zone from GMT. If you are west to GMT then use negative values.
b. Change the variable dsSeconds to reflect the standard change from your time-zone
c. Edit the file NetArduino.pde and change the variable weatherDataGetString to match you location (change Tel-Aviv to be your city). I recommend checking in the browser that it works by typing: in your browser address field. You should see some XML reply in return if that works.
8. Open the Arduino sketch NetArduino.pde, compile and load the program to your Arduino
9. Connect your micro-SD reader to your PC with the micro-SD in it
10. Save all the files from the microSD subdirectory into the root directory of the micro-SD
11. Safely remove the micro-SD from the reader and place it in the display or display adaptor
12. Disconnect the display and Arduino from PC
13. Connect the display or display adaptor to your Arduino as following:
a. Vcc of the display/adaptor to +5V of Arduino
b. GND of the display/adaptor to one of the Arduino GND connections
c. Connect the Digital I/O pin 5 of Arduino to Rx pin (3rd pin from the right on the adaptor when VGA connector is on the top)
d. Connect the Digital I/O pin 4 of Arduino to Tx pin (2nd pin from the right on the adaptor)
14. Build a small circuit for the push button (see optional DHT sensor circuit too for schema) as following:
a. Push button connects to Vcc on one side and to resistor of 10K ohm on the other side.
b. Other side of the resistor connected to ground
c. Connect Arduino pin 2 to resistor/push-button junction
15. Connect the Ethernet cable to the Arduino
16. Connect the VGA display to the adaptor if you chose to use adaptor
17. Connect power supply to Arduino
18. Enjoy the weather

Step 4: Completing the Assembly

If you also want the indoor temperature and humidity, follow these steps:
1. Build a small circuit with DHT22, Vcc goes to Arduino Vcc, GND to the Arduino GND and a 10K Ohm resistor from Vcc to the data pin.
2. Connect the data-pin of DHT22 to pin 3 of the Arduino

Step 5: Are You Using Celsius or Fahrenheit?

This program displays temperatures in Celsius. If however you are using Fahrenheit degrees, here are the changes you need to do (pretty simple)
1. Edit the 4GL display program file and change the function ShowCelsiusSymbol and change putstr("C"); to putstr("F");
2. Change the thresholds of temperatures for Hot and Cold indicators (TEMP_THHOT and TEMP_THCOLD constants) to what you think is good for you (89 and 68 is the equivalents of my current Celsius settings)
3. Edit the Arduino file NetArduino.pde and change the function _ProcessWeatherXMLLine so that instead of the line:
if ((location = matchXmlTag(ptr, PSTR("<temp_c data="))) != 0)
You will have
if ((location = matchXmlTag(ptr, PSTR("<temp_f data="))) != 0).
That is take the XML tag temp_f instead of temp_c
4. Change the function Far2Cel in the same file to basically return t; instead of all the lines in there.
5. Compile and load the programs to the devices

Step 6: Adding or Changing Icons

I downloaded many images, including snow.gif (last snow in Tel-Aviv was in 1950). However, it is possible that there are conditions I do not know about. Since the API of Google Weather is not documented, I honestly don't know if there are more. If you come across a missing one, here are the steps required to add an additional icon (see also pictures for using the tools):
1. Get the missing icon from Google by following these steps (see picture too):
a. Open your browser and point it to Google service by typing in your browser
b. See missing icon should be listed there in the XML in an entry similar to this: <icon data="/ig/images/weather/foobar.gif"/> with icon name instead of foobar of course.
c. Download the image by typing the following in the browser:, right click on the image and save it to the folder with the images (microSD folder).
d. Launch the 4D systems tool called Graphics Composer, open the file goowea.gcs
e. Push the Add button below the list of image files and add your new icon file
f. Save the file using the save button
g. Write down where the new icon file was added (before what and after what other file)
h. Push the build button (looks like a chip with red legs)
i. Exit the tool
2. Connect the micro-SD reader to your PC and save the folder of microSD on it again
3. Modify the 4D display program to know about the new icon and place the name in exactly the same place of order as saved from step 1.g above. So if the new icon name is foobar.gif then edit the file WeatherScreen.4dg in the 4D directory (assuming foobar.gif is the name and placed between coudy.gif and haze.gif. Change the lines:
byte i_Cloudy  "cloudy.gif",0
byte i_Haze    "haze.gif",0
byte i_Cloudy  "cloudy.gif",0
byte i_FooBar "foobar.gif",0
byte i_Haze    "haze.gif",0
And the lines
word IconNames
        i_coRain, i_coSnow, i_coStorm, i_Cloudy, i_Haze, i_mCloudy, i_mSunny, …
word IconNames
        i_coRain, i_coSnow, i_coStorm, i_Cloudy, i_FooBar, i_Haze, i_mCloudy, i_mSunny, …
4. Send me the data, please

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    57 Discussions


    7 years ago on Introduction

    After some period of time, I found few missing icons of weather and added those to the code. See the file


    3 years ago

    Hye zmashiah,

    i'm doing a similar project with this now, but i'm use a mbed LPC1768 and want to display the result on TV-LCD

    May I ask a question or your suggestions ?

    Do you think this project also can support with mbed board, is it possible ?

    Thank you

    1 reply

    Reply 3 years ago

    Hi Kashsya,
    I don't have first hand experience with mbed however if it has "network access" and more than 4K or RAM, it is possible.
    Do note that Google stopped their weather service and I have another similar project using WeatherUnderground as the source for the weather data instead.


    4 years ago

    Hi there zmashiah!

    First of all I want to say that it is a really great project!

    I have a few questions.

    I'm using Arduino Mega for this project+ Ethernet Shield how should I connect the the display (i'm using uLCD-32PT display as you suggested) to the arduino with the shield on? just to note the shield uses pins number 0-13 on the pwm side and 0-7 on the analog side. can I use Rx1 and Tx1 instead the pins you recommended? and should i change something in the code if I do so?

    another question will I still be able to see the weather? since I can't really see if google still supports weather service.

    Thanks alot!

    1 reply

    Reply 4 years ago

    Thank Rocky575,

    Please note that Google end-of-life the weather web service. I have published another similar project that is based on Netduino Plus, with similar display as in here and it relies on Weather-Underground as weather data provider. The code there is easily ported to any of the newer Netduino members (C# coding is much simpler).

    With respect to your question: You can modify the code to use different Serial port (UART), but as I am not familiar with shields you use, I can say if you can keep them stacked on the Mega with no collisions or not.


    4 years ago

    Is there a way to make this an updatable file? I need a file/s that not only can run Google maps but also a compass, weather display and temperature monitoring feature with display.

    1 reply

    Reply 4 years ago

    Not sure what you mean updateable file. You can extend this as you like pretty easily. Having said that note that Google stopped supporting this weather service. I have another project on Instructables that uses Netduin+ to lookup weather data from WeatherUnderground. That one is pretty neat and work smoothly.


    Reply 5 years ago on Introduction

    Pretty confident you can. I don't have one and never tried it, but I would think that aside from setup() that needs to initialize the WiFi shield instead of the Ethernet all the rest would be the same.


    Reply 5 years ago on Introduction

    I'm going to buy a wifi shield and give it a try, if it work, I'll post it. Thanks!


    Reply 5 years ago on Introduction

    Just before you build this one, take a look at a different one I built that uses Netduino Plus and gets the data from Weather Underground. Much better if you ask me, and the latter is working in my living room for almost 3 years now


    5 years ago on Introduction

    This is an extremely impressive project. Thanks for sharing it! The LCD display is so cool!

    1 reply

    7 years ago on Introduction

    Really great work thanks for instructions.

    I'm also doing one application which may need to use some of your ideas. I'm not using any ethernet support in my application so i'll go with Arduino Uno and uVGA II.
    In my application i've to write code for Arduino and connect to VGA monitor through uVGA.

    The catch here is data which is going to display on monitor ll be data transfered by some other system to my main Arduino board (may be via wireless media) and one more thing is i need to produce output with resolution 1024*768 or higher...

    Any one can help me out. Will the same setup support my requirements?????.


    5 replies

    Reply 7 years ago on Introduction

    From what I know the uVGA does not have such high resolution.From their site you will see the supported resolutions:
    Supports the following resolutions,
    - 320 x 240 (QVGA)
    - 640 x 480 (VGA)
    - 800 x 480 (WVGA)
    If the required resolution is a strong requirement, go for Rasbery PI (but it has HDMI connection not VGA).


    Reply 7 years ago on Introduction

    Is any other vga controllers avilable with 1024*768 or higher resolution compatible to any other boards????


    Reply 7 years ago on Introduction

    Not that I know of. Please remember you have ONLY 2KB of RAM on Arduino (unless you are using Arduino Mega). There is very little you can do with it for driving a detailed 1024x768 resolution screen.

    Rasbery PI is a nice embedded board, cost in same range of Arduino and running Linux. I think it is the best choice if you need to drive hi-res screen.


    Reply 7 years ago on Introduction

    Tanks for suggestions.

    Can we interface other modules like zigbee, sensors etc?????

    I'm checking, but i'm not getting any datasheet or full specifications.

    last but not least, my application can run on any 16/32 bit controller. But getting output in monitor with high resolution is my first constraint.


    Reply 7 years ago on Introduction

    Given Rasbery PI is Linus there will be support for Zigbee through open source libraries. I know there is at least one such library. You need to have UART support on the board to interface with these modules.


    7 years ago on Introduction

    Thanks for the great work.

    I am using the LCD-43 and does not update the data on the screen.

    I changed the rx and tx pins but still not working, any ideas?