Emailing from your Arduino Yún is easy

We'll show you how to send an email via Gmail from your Arduino Yún. Then imagine all the notes you can have it send—reminders, alerts, sweet nothings, etc. This sketch uses our Google > Gmail > SendEmail Choreo.

Get Set Up

1Make sure you have a Temboo account. If you don't already have one, you can register for free.

2Next, we recommend creating a new Gmail account for sending email programmatically—you can do that here. After you've created your new account, you can skip to step 10.

If you'd like to use an existing Gmail account, you'll need to enable 2-Step Verification and generate an App Password for Temboo. Steps 3 - 9 walk you through this process.

3Sign in to your Google Account settings page by clicking on your name or picture in the upper right corner of the screen and then clicking Account.

4Scroll down to the "Signing in" box.

5Click 2-Step Verification. This will bring you to the 2-Step Verification settings page.

6You will then see a step-by-step guide which will guide you through the setup process.

7After you've enabled 2-Step Verification, you'll be prompted to create an App Password.

8In the Select app dropdown menu, choose "Other", and give this app a name (e.g., TembooApp).

9Click "Generate". You'll be given a 16-digit passcode that can be used to access your Google Account from Temboo.

Note: If you wish to authenticate with OAuth credentials, you should use the Google > Gmailv2 Choreos.

10Make sure that you have the latest version of the Arduino IDE. You should also be sure that you have the newest version of the Temboo Library by checking the Arduino Library Manager

11Make sure that your Yún is connected to the Internet. Arduino has a helpful guide if you need assistance.

Write the Sketch

Copy the sketch code below into a new tab in your Arduino IDE. This code calls the SendEmail Choreo, and you will need to replace the placeholder values in the code with your own Gmail account details.


  Demonstrates sending an email via a Google Gmail account using the Temboo Arduino Yun SDK.

  This example code is in the public domain.

#include <Bridge.h>
#include <Temboo.h>
#include "TembooAccount.h" // contains Temboo account information


// Note that for additional security and reusability, you could
// use #define statements to specify these values in a .h file.

// your Gmail username, formatted as a complete email address, eg ""
const String GMAIL_USER_NAME = "xxxxxxxxxx";

// your Gmail App-Specific Password
const String GMAIL_PASSWORD = "xxxxxxxxxx";

// the email address you want to send the email to, eg ""
const String TO_EMAIL_ADDRESS = "xxxxxxxxxx";

boolean success = false; // a flag to indicate whether we've sent the email yet or not

void setup() {

  // for debugging, wait until a serial console is connected


void loop()
  // only try to send the email if we haven't already sent it successfully
  if (!success) {

    Serial.println("Running SendAnEmail...");
    TembooChoreo SendEmailChoreo;

    // invoke the Temboo client
    // NOTE that the client must be reinvoked, and repopulated with
    // appropriate arguments, each time its run() method is called.
    // set Temboo account credentials

    // identify the Temboo Library choreo to run (Google > Gmail > SendEmail)

    // set the required choreo inputs
    // see 
    // for complete details about the inputs for this Choreo

    // the first input is your Gmail email address
    SendEmailChoreo.addInput("Username", GMAIL_USER_NAME);
    // next is your Gmail App-Specific password.
    SendEmailChoreo.addInput("Password", GMAIL_PASSWORD);
    // who to send the email to
    SendEmailChoreo.addInput("ToAddress", TO_EMAIL_ADDRESS);
    // then a subject line
    SendEmailChoreo.addInput("Subject", "ALERT: Greenhouse Temperature");

     // next comes the message body, the main content of the email   
    SendEmailChoreo.addInput("MessageBody", "Hey! The greenhouse is too cold!");

    // tell the Choreo to run and wait for the results. The 
    // return code (returnCode) will tell us whether the Temboo client 
    // was able to send our request to the Temboo servers
    unsigned int returnCode =;

    // a return code of zero (0) means everything worked
    if (returnCode == 0) {
        Serial.println("Success! Email sent!");
        success = true;
    } else {
      // a non-zero return code means there was an error
      // read and print the error message
      while (SendEmailChoreo.available()) {
        char c =;

    // do nothing for the next 60 seconds

Create Your Header File

The sketch above references the TembooAccount.h header file, which contains your Temboo account information.

If you are currently logged in, you'll see your account details in the code snippet below (otherwise you'll see placeholder values). Copy the code snippet into a new tab in Arduino and call it TembooAccount.h.

#define TEMBOO_ACCOUNT "ACCOUNT_NAME"  // your Temboo account name 
#define TEMBOO_APP_KEY_NAME "APP_NAME"  // your Temboo app key name
#define TEMBOO_APP_KEY  "APP_KEY"  // your Temboo app key

With both files in place you are ready to upload the sketch and send an email from your Yún. No need to send us thank you notes.

Convert the sketch to work with the Yún Shield

If you're working with the Yún Shield paired with another Arduino board, you'll need to make some small changes to the Yún sketch above it so that it's compatible with the Arduino Yún Shield.

1First, change the include statement #include <Temboo.h> to #include <TembooYunShield.h>. Your include statements should look like this:

#include <Bridge.h>
#include <TembooYunShield.h>
#include "TembooAccount.h" 

2Next, change the Temboo object name from TembooChoreo to TembooYunShieldChoreo. Your code should look like this:

TembooYunShieldChoreo  SendEmailChoreo;

3Now your code is ready to run on your Yún Shield!

What's Next?

Now that your Yún is sending emails, why not check out the other 2000+ Choreos in our Library and start thinking about all the possibilities for your next Yún project.

Need Help?

We're always happy to help. Just email us at, and we'll answer your questions.