Picture of How to use Google docs for data logging
I have a Netduino+ hooked up on the Internet with data logging  via Google docs.
Before i found this i was collecting the data via a SD card, on the Netduino.

I read almost every day Hackaday here i stumbled up at http://hackaday.com/2012/05/31/data-logging-directly-to-google-docs-google-drive/

But this didn't work for me, but i knew i was on the right trail.

After a lot of googleling  it worked for me, this (story) is how i did it.

I have tried to simply the whole thing in only text, with links to more relevant documents.
Please ask in the comments and i will try to answer these.

If something relevant is asked i maybe will change this instructable to clarify some streps, so please read first then ask.

This way of collecting is also useful with writing software with a database, you don't need a server with SQL or other language.

Step 1: Filling a spreadsheet

Picture of Filling a spreadsheet
Filling a spreadsheet in google docs goes always via a form:
After hitting the Submit button on this form the URL is send to Google docs:

When you change the URL with the right values then you can send your data from a micro-controller or software to the spreadsheet.
igagnon5 months ago


I believe the format for the URL's for google's forms has changed. There is no longer a formkey, or it is not specified as it used to be. Does anyone know how to identify the formkey in the new URL format?


sukinesh7 months ago

is it possible to create the link you created and run it in browser itself?

or can it be used in a html webpage as submittion button?

morthole (author)  sukinesh7 months ago
As in step 2 and 3 you see it is a conversion from HTML to C.
In step 6 you see the link itself created from de HTML Form tag.
sukinesh7 months ago

is it possible to create the link you created and run it in browser itself?

or can it be used in a html webpage as submittion button?

PiyaliD8 months ago


I am trying to send arduino data (of a sensor) to google spreadsheets using WiFi shield. But the data is not been saved in the spreadsheet. Here is my code:

#include <WiFi.h>

int SensorIn1 = 1;

int led_pin = 13;

char ssid[] = "**********";//Network name

char pass[] = "*********";// Network Password

int status = WL_IDLE_STATUS;

WiFiServer server(80);

void setup() {

Serial.begin (9600);

while ( status != WL_CONNECTED) {

Serial.print("Attempting to connect to WPA SSID: ");


// Connect to WPA/WPA2 network:

status = WiFi.begin(ssid, pass);

// wait 10 seconds for connection:



Serial.print("You're connected to the network");

server.begin(); // initialise the server

// print out your network data




void loop() {

WiFiClient client = server.available();

int val;

val = analogRead(SensorIn1);


delay (100);

if (client) {

Serial.println("new client");

boolean currentLineIsBlank = true;

while (client.connected()) {

if (client.available()) {

char c = client.read();


//if (client.connected()) {


// send a standard http response header

String data = "&entry.1515954247=";

data = data + val;

data = data + "&submit=Submit";

client.print("POST /forms/d/1tUMKnf1HYY5tCuG_lG93N9kJhd4voQ1elRmTXYzLm/formResponse?");

client.println("ifq HTTP/1.1\r\n");

client.println("Host: docs.google.com");

client.println("User-Agent: Arduino/1.0");

client.println("Content-Type: application/x-www-form-urlencoded");

client.println("Connection: close");

client.println("Refresh: 1");


//client.print("Content-Length: ");







delay (100);


Serial.println("client disconnected");



void printWifiData() {

// print your WiFi shield's IP address:

IPAddress ip = WiFi.localIP();

Serial.print("IP Address: ");


// print your MAC address:

byte mac[6];


Serial.print("MAC address: ");













void printCurrentNet() {

// print the SSID of the network you're attached to:

Serial.print("SSID: ");


// print the received signal strength:

long rssi = WiFi.RSSI();

Serial.print("signal strength (RSSI):");


// print the encryption type:

byte encryption = WiFi.encryptionType();

Serial.print("Encryption Type:");




Can anyone help me in debugging this. I have seen many references from google but nothing is working out.

morthole (author)  PiyaliD7 months ago

You send your values to docs.google.com instead of spreadsheets.google.com

maybe this is what goes wrong.

PiyaliD morthole7 months ago

I tried with docs.google.com as well but the problem is still the same. I can give you the spreadsheet key and the form key separately if that helps.

morthole (author)  PiyaliD7 months ago

per 04 januari 2015:


Here comes the form key


This still works

It is important that you replicate the exact structure in your code like in Step 4 there are a few variable you missed.

Write out your code as a URL and put it in your browser navigation then you can see what goes wrong.

Step 4:

const string FormKey = "Here comes the form key"; // Important DON't use the spreadsheet key. this is a different key

static string GoogleIP = "spreadsheets.google.com"; // Google adress

static Int32 GooglePort = 80; // Port Number 443=https 80=http

Fill the parameters:

formdata = "&entry.0.single=" + value.ToString();

formdata += "&entry.1.single=" + value.ToString();

formdata += "&entry.2.single=" + value.ToString();

formdata += "&entry.3.single=" + value.ToString();

formdata +=
"&pageNumber=0&backupCache=&submit=insturen"; // close with
this these are hidden on the form

Also important is last line with the pagenumber=0 variable it is for me a few years ago it worked for me on the moment i'am not using it anymore maybe googledocs has changed dramatic. the trick is to replicate the HTML form data in your C code.

PiyaliD morthole7 months ago

Hi, I am getting trouble in executing client.connect(server, 80)

The console in not getting inside this block since client.connect(server, 80) returns false in my case. The issue you are addressing might be there after establishing a connection. But there is no connection established in this case. Find attached a simple code here with pushingbox as the intermediate way to the server. This is the output I get with the code attached.









morthole (author)  PiyaliD7 months ago

I'am sending the data directly to google and not via an intermediate as pushingbox.

In your example code you are trying to login by pushingbox and not directly by google. All the error codes are from pushinbox and not from google i think.

I have seen somewhere on internet a example via pushingbox, i didn't want to make a account on the pushingbox site so i didn't dig deeply into that. I have not read the articles about pushingbox, mayby has the pushingbox site the right answer for you.

It is important that your code behave as a webbrowser the only check i now have, is via an URL and that is still working, my Netduino is not anymore connected to internet so i'am not 100% sure that my code still works.I'am only sure the URL typed in the webbrowser is working.

morthole (author)  morthole7 months ago

In reply to myself: this is maybe the answer it seems google is using port 443 ssl connection, arduino based boards are not powerfull enough for this kind of connections:


found via:


cwalger2 years ago
Thanks for the great description :-) Does this still work with Google Drive? Thanks!
morthole (author)  cwalger2 years ago
Hi cwalger,
i have tried it with my code and it still works:
spreadsheets.google.com/formResponse?formkey=Here comes your formkey&ifq&entry.0.single=10&entry.1.single=20&entry.2.single=30&entry.3.single=40&pageNumber=0&backupCache=&submit=insturen
Does this still work as of September 2013? I'm trying to follow, but not finding instances to "entry.#.single" in the source coding for the form.
morthole (author)  SpacemanSpiff_604061 year ago
Hi Spaceman,
I have looked at it and have make a new form to test i think the idea from above instructable stil works.
Look at the form source code find the tag of your field here you find the parameter name="entry.#"
# mean a randomnumber(?) generated by googledocs/drive
See step 2 of my instructable. I hope i have answered your question?
DouglasG12 years ago
does it regularly update the data? If so is there a set time for the update?
morthole (author)  DouglasG12 years ago
You decide when to update.
When you send data to the spreadsheet it is updated immediately.
I hope i answered your question?

The netduino in this example sends every minute the data to the spreadsheet.