After the database provider has been successfully registered, the persistence layer is ready to be used. We now continue with the first step in acquiring the sensor data: sampling. Sampling is normally done using a short regular time interval. Since we use the Arduino, we get values as they change. While such values can be an excellent source for event-based algorithms, they are difficult to use in certain kinds of statistical calculations and error-correction algorithms. To set up the regular sampling of values, we begin by creating a
Timer object from the
System.Threading namespace, after the successful initialization of the Arduino:
this.sampleTimer = new Timer(this.SampleValues, null, 1000 - DateTime.Now.Millisecond, 1000);
This timer will call the
SampleValues method every thousand milliseconds, starting the next second. The second parameter allows us to send a state object to the timer callback method. We will not use this, so we let it be
null. We then...