Meadow.Foundation.Sensors.Light.Tcs3472x

Tcs3472x
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

Code Example

Tcs3472x sensor;
RgbPwmLed rgbLed;

public override Task Initialize()
{
    Console.WriteLine("Initialize...");

    sensor = new Tcs3472x(Device.CreateI2cBus());

    // instantiate our onboard LED
    rgbLed = new RgbPwmLed(
        Device,
        Device.Pins.OnboardLedRed,
        Device.Pins.OnboardLedGreen,
        Device.Pins.OnboardLedBlue,
        commonType: CommonType.CommonAnode);

    // Example that uses an IObservable subscription to only be notified when the filter is satisfied
    var consumer = Tcs3472x.CreateObserver(
        handler: result => Console.WriteLine($"Observer: filter satisifed: {result.New.AmbientLight?.Lux:N2}Lux, old: {result.Old?.AmbientLight?.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.AmbientLight.Value - old.AmbientLight.Value).Abs().Lux > 100);
            }
            return false;
        });
    sensor.Subscribe(consumer);

    // classical .NET events can also be used:
    sensor.Updated += (sender, result) => {
        Console.WriteLine($" Ambient Light: {result.New.AmbientLight?.Lux:N2}Lux");
        Console.WriteLine($" Color: {result.New.Color}");
        if (result.New.Color is { } color) { rgbLed.SetColor(color); }
    };

    return Task.CompletedTask;
}

public override async Task Run()
{
    var (AmbientLight, Color, Valid) = await sensor.Read();

    Console.WriteLine("Initial Readings:");
    Console.WriteLine($" Visible Light: {AmbientLight?.Lux:N2}Lux");
    Console.WriteLine($" Color: {Color}");
    if (Color is { } color) { rgbLed.SetColor(color); }

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

Sample project(s) available on GitHub