Meadow.Foundation.Sensors.Light.Si1145 1.2.1.11-beta

Meadow.Foundation.Sensors.Light.Si1145

SI1145 I2C ultraviolet and ambient light sensor

The Si1145 library is designed for the Wilderness Labs Meadow .NET IoT platform and is part of Meadow.Foundation

The Meadow.Foundation peripherals library is an open-source repository of drivers and libraries that streamline and simplify adding hardware to your C# .NET Meadow IoT application.

For more information on developing for Meadow, visit developer.wildernesslabs.co, to view all of Wilderness Labs open-source projects, including samples, visit github.com/wildernesslabs

Usage

Si1145 sensor;

public override Task Initialize()
{
    Resolver.Log.Info("Initialize...");

    sensor = new Si1145(Device.CreateI2cBus());

    // Example that uses an IObservable subscription to only be notified when the filter is satisfied
    var consumer = Si1145.CreateObserver(
        handler: result => Resolver.Log.Info($"Observer: filter satisifed: {result.New.VisibleLight?.Lux:N2}Lux, old: {result.Old?.VisibleLight?.Lux:N2}Lux"),
   
        // only notify if the visible light changes by 100 lux (put your hand over the sensor to trigger)
        filter: result => {
            if (result.Old is { } old) { //c# 8 pattern match syntax. checks for !null and assigns var.
                // returns true if > 100lux change
                return ((result.New.VisibleLight.Value - old.VisibleLight.Value).Abs().Lux > 100);
            }
            return false;
        });

    sensor.Subscribe(consumer);

    // classical .NET events can also be used:
    sensor.Updated += (sender, result) => {
        Resolver.Log.Info($" Visible Light: {result.New.VisibleLight?.Lux:N2}Lux");
        Resolver.Log.Info($" Infrared Light: {result.New.Infrared?.Lux:N2}Lux");
        Resolver.Log.Info($" UV Index: {result.New.UltravioletIndex:N2}Lux");
    };

    return Task.CompletedTask;
}

public override async Task Run()
{
    var (VisibleLight, UltravioletIndex, Infrared) = await sensor.Read();

    Resolver.Log.Info("Initial Readings:");
    Resolver.Log.Info($" Visible Light: {VisibleLight?.Lux:N2}Lux");
    Resolver.Log.Info($" Infrared Light: {Infrared?.Lux:N2}Lux");
    Resolver.Log.Info($" UV Index: {UltravioletIndex:N2}Lux");

    sensor.StartUpdating(TimeSpan.FromSeconds(1));
}