Arduino Due and Mobile Service

Let's see how the code works. We include in this case the library installed for the sensor DHT11, in this case the file dht11.h, while the other two libraries were already in the previous article. There are three variables of type const char *, that are nothing more than the name of the table, the server name and the code key, all you need to upload the data. With the preceding code, we specify in what format we are sending data and then type JSON and in the last piece of code, we specify the pattern, or what will meet in the table tabsensor when we're going to see if the data has been loaded properly. The Setup method we have already seen in the previous article and more interesting and the Loop method. Declare a variable of type int that does nothing but read the status of the sensor temperature and humidity, this means that the read method as a parameter requires the input pin. We recall then the method write_sensorvalue passing as parameters the values of temperature and humidity with DHT.temperature and DHT.humidity. The last instruction code is nothing more than a waiting time of ten seconds before starting a new reading. We have now completed the part relating to the code, we are now ready to do the function tests, but first, we must load the sketch code on the Arduino Due, to this procedure refer you to the previous article. Test application Let's have a look now inside the table tabsensor, we will find this situation. This is because we have not defined any record within it, but also any column. We can feed now Arduino Due in various ways, either with its power supply or by attacking the USB port of our PC, where we are now because we have previously uploaded the sketch code. If all goes correctly you should see the green LEDs flash card Ethernet Shield, this means that it went into operation, but especially when we go to the Azure portal and check if the data has been loaded and if all are done properly here is what we will see. We note that from the services of Azure has added for us humidityvalue and tempvalue fields with other fields, id, timestamp and version, the latter are not part of our code but are added automatically when you insert a new record into the tabsensor table, in other words, we did not need to worry about any of this, we let Azure do it.

Conclusion

In this second article, we saw how Arduino can interact with Microsoft Azure and Mobile Services by creating a simple circuit where we read, using sensor DHT11, the values of temperature and humidity and then saved the data in the table tabsensor. In the next article, we will create an application Windows Phone 8.1 that will ensure the display of the data and then take a specific action.