How to connect an Arduino Yun to Altair SmartCore and build an Alert System.

0. Introduction

This easy tutorial helps you build an Alert System for your home or office.
To do this, we use an Arduino Yun able to detect light and the Altair SmartCore Engine to send alerts by email.
In this project you will learn how to:

  • Connect an Arduino Yun to Altair SmartCore to send data streams using Altair SmartCore and cURL
  • Build an Alert App on Altair SmartCore by programming a Listener to send an email using the SDK



  • 1 x An Arduino Yun
  • 1 x Tiny Breadboard
  • 1 x Resitance. Range between 200KΩ and 10KΩ
  • 1 x Foto Sensor. Try to improve the project with a motion detection sensor

Music to listen: Regina Spektor - Fidelity


1. Project Schema

This project is a quick way to create an alarm app and understand the basics of combining Arduino Yun and Altair SmartCore.

Here is the overall diagram of the project:

  • Schema

The Arduino Yun is programmed to send a data stream to Altair SmartCore stating whether or not it's receiving light.

All the data streams sent by Arduino Yun are collected and stored in Altair SmartCore. Altair SmartCore is a huge database that collects all the information that your sensors send.

In addition to storing data, the true power of Altair SmartCore is to let you build Apps very quickly with few lines of Groovy code. In this scenario we are going to build a very simple Alert App that sends an email to you when Arduino Yun detects light.

With Altair SmartCore you can build very complex Apps to support all the logic of your product on the cloud and integrate it with other devices and IT systems. But for now let’s keep it simple.

Although this Alert App is very simplistic, you can use it to detect if someone enters a dark room and turns on the lights. In fact this project is quite useful in our data-center, where the lights are always turned off.


2. Arduino Yun. Connections description

The connections in Arduino Yun are extremely simple. You can see in the diagram below.

  • Diagram


3. Altair SmartCore Project and Device Registration


If you're registered in Altair SmartCore, you have a default device already created for you.
Check your control panel and see what it looks like.
Basically you need the device id_developer that might be something like defaultDevice@myusername.
But if you want, you can create a new device and use it in this example.


Now, go to your control panel “My account menu” and check your Apikey.
Its a big alphanumeric token like:
You need this number to complete the example.


4. Data Transferred from Arduino Yun to Altair SmartCore

In this tutorial we will use Linino's installed cURL. If you are not familiar with cURL you might want to check the official page: for further details. You can also follow this tutorial with other REST clients such as hurl ( or Poster plugin ( to check that you're doing thing right.

Your payload, the stream to send to Altair SmartCore, will be:

This is the Arduino code to build the payload (see the whole code here):

If you want more information about how to send streams to Altair SmartCore using the Arduino Yun, use the "How to send streams" → "ArduinoYUN" tutorial (Arduino Yun Streams Tutorial)


5. Code implemented on Arduino Yun

This is the code for the Arduino Yun. Note that some values should be replaced by your own values.


6. Checking Data is collected in Altair SmartCore

If you get here, your device must be sending streams when you turn on and turn off the lights.

Its time to test our control panel and check if we have new streams.
Go to “Data management” → “Data streams” and you will see your data.

  • menu option
  • new data


7. Creating an Alert with Altair SmartCore Listeners

A listener in Altair SmartCore can be associated to any hierarchy entity, from Project to Device. If you associate a listener to a project, all devices below the services of that project will be affected. If you associate a listener to a service, all devices below the groups of that service will be affected. And so on.

In this example, we create a listener associated with our device. This listener waits for an event to occur in the context of the device and then it evaluates the content.

To create a listener go to the control panel, then to “Rules” → “Listeners” and click on the new button. Select "Device" as "entity type" and select your device on the "Id" field.

Fill the fields with the following values and save the new listener

  • Name: The name that you prefer
  • Description: The description that you prefer
  • Entity type: Device
  • Entity id: Your device id
  • Event to listen: data_persisted
  • If expression:"ON"
  • Then expression:
    def email = new Email ();"YOUR EMAIL HERE";
    email.message="Alarm ON";
  • Then rule: leave empty
  • Else expression:
    def email = new Email ();"YOUR EMAIL HERE";
    email.message="Alarm OFF";
  • Else rule: leave empty
  • Be sure to have your listener enabled if you want it to be executed

Its time to test our listener. Send a data stream to this device, check your control panel and your email!!!


8. From here on: Enhancing the project

Now you know how to connect an Arduino Yun device to send data to Altair SmartCore and how to create a simple App with a single Listener and some SDK programing in Groovy. But you can enhance this project in many ways:

  • Try to add a motion sensor to the Arduino Yun and send at least two values: light and motion status
  • Create your own control panel to check the status of the Arduino Yun, by building an HTML page with a request to our API to ask for the status value of your device
  • Create another device that you can interact with (like a sound alarm) and build an app combining actions between the two devices through Altair SmartCore