Meadow.Foundation.Sensors.Light.Bh1745 1.12.8

Meadow.Foundation.Sensors.Light.Bh1745

Bh1745 I2C luminance and color light sensor

The Bh1745 library is included in the Meadow.Foundation.Sensors.Light.Bh1745 nuget package and is designed for the Wilderness Labs Meadow .NET IoT platform.

This driver is part of the Meadow.Foundation peripherals library, an open-source repository of drivers and libraries that streamline and simplify adding hardware to your C# .NET Meadow IoT applications.

For more information on developing for Meadow, visit developer.wildernesslabs.co.

To view all Wilderness Labs open-source projects, including samples, visit github.com/wildernesslabs.

Installation

You can install the library from within Visual studio using the the NuGet Package Manager or from the command line using the .NET CLI:

dotnet add package Meadow.Foundation.Sensors.Light.Bh1745

Usage

Bh1745 sensor;
RgbPwmLed rgbLed;

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

    sensor = new Bh1745(Device.CreateI2cBus());

    // instantiate our onboard LED that we'll show the color with
    rgbLed = new RgbPwmLed(
        Device.Pins.OnboardLedRed,
        Device.Pins.OnboardLedGreen,
        Device.Pins.OnboardLedBlue,
        commonType: CommonType.CommonAnode);

    // Example that uses an IObservable subscription to only be notified
    var consumer = Bh1745.CreateObserver(
        handler: result => Resolver.Log.Info($"Observer: filter satisfied: {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)
            {
                // 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) =>
    {
        Resolver.Log.Info($"  Ambient Light: {result.New.AmbientLight?.Lux:N2}Lux");
        Resolver.Log.Info($"  Color: {result.New.Color}");

        if (result.New.Color is { } color)
        {
            rgbLed.SetColor(color);
        }
    };

    return Task.CompletedTask;
}

public override async Task Run()
{
    var result = await sensor.Read();

    Resolver.Log.Info("Initial Readings:");
    Resolver.Log.Info($" Visible Light: {result.AmbientLight?.Lux:N2}Lux");
    Resolver.Log.Info($" Color: {result.Color}");

    if (result.Color is { } color)
    {
        rgbLed.SetColor(color);
    }

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

How to Contribute

• Found a bug? Report an issue
• Have a feature idea or driver request? Open a new feature request
• Want to contribute code? Fork the Meadow.Foundation repository and submit a pull request against the develop branch

Need Help?

If you have questions or need assistance, please join the Wilderness Labs community on Slack.

About Meadow

Meadow is a complete, IoT platform with defense-grade security that runs full .NET applications on embeddable microcontrollers and Linux single-board computers including Raspberry Pi and NVIDIA Jetson.

Build

Use the full .NET platform and tooling such as Visual Studio and plug-and-play hardware drivers to painlessly build IoT solutions.

Connect

Utilize native support for WiFi, Ethernet, and Cellular connectivity to send sensor data to the Cloud and remotely control your peripherals.

Deploy

Instantly deploy and manage your fleet in the cloud for OtA, health-monitoring, logs, command + control, and enterprise backend integrations.