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Mastering Internet of Things by Peter Waher

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Calculating basic statistics

A sensor normally reports more than the measured momentary value. It also calculates basic statistics on the measured input, such as peak values. It also makes sure to store measured values regularly, to allow its users to view historical measurements. We begin by defining variables to keep track of our peak values:

private int? lastMinute = null; 
private double? minLight = null; 
private double? maxLight = null; 
private DateTime minLightAt = DateTime.MinValue; 
private DateTime maxLightAt = DateTime.MinValue; 

We then make sure to update these after having calculated a new measurement:

DateTime Timestamp = DateTime.Now; if (!this.minLight.HasValue || Light < this.minLight.Value) { this.minLight = Light; this.minLightAt ...

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