Meadow.Foundation.Sensors.Atmospheric.Bh1900Nux

Bh1900Nux
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

Code Example

private Bh1900Nux _sensor;

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

    _sensor = new Bh1900Nux(Device.CreateI2cBus(), Bh1900Nux.Addresses.Default);

    var consumer = Bh1900Nux.CreateObserver(
        handler: result =>
        {
            Resolver.Log.Info($"Observer: Temp changed by threshold; new temp: {result.New.Celsius:N2}C, old: {result.Old?.Celsius:N2}C");
        },
        filter: result =>
        {
            if (result.Old is { } old)
            {
                return (result.New - old).Abs().Celsius > 0.5;
            }
            return false;
        }
    );
    _sensor.Subscribe(consumer);

    _sensor.Updated += (sender, result) =>
    {
        Resolver.Log.Info($"  Temperature: {result.New.Celsius:N2}C");
    };

    return Task.CompletedTask;
}

public async override Task Run()
{
    var conditions = await _sensor.Read();
    Resolver.Log.Info("Initial Readings:");
    Resolver.Log.Info($"  Temperature: {conditions.Celsius:N2}C");

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

Sample project(s) available on GitHub

Wiring Example

To wire a Adafruit Bh1900Nux Sensor to your Meadow board, connect the following:

Bh1900Nux	Meadow Pin
GND	GND
VCC	3.3V
SCL	D08
SDA	D07

Class Bh1900Nux

Represents a Bh1900Nux temperature sensor

Assembly: Bh1900Nux.dll

View Source

Declaration

public class Bh1900Nux : ByteCommsSensorBase<Temperature>, IObservable<IChangeResult<Temperature>>, IDisposable, ITemperatureSensor, ISamplingSensor<Temperature>, ISensor<Temperature>, ISensor, ISamplingSensor, II2cPeripheral

Inheritance: System.Object -> Meadow.Foundation.ObservableBase<UNIT>

Implements:
System.IObservable<Meadow.IChangeResult<Meadow.Units.Temperature>>, System.IDisposable, Meadow.Peripherals.Sensors.ITemperatureSensor, Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.Temperature>, Meadow.Peripherals.Sensors.ISensor<Meadow.Units.Temperature>, Meadow.Peripherals.Sensors.ISensor, Meadow.Peripherals.Sensors.ISamplingSensor, Meadow.Hardware.II2cPeripheral

Properties

Temperature

The current temperature

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Declaration

public Temperature? Temperature { get; }

DefaultI2cAddress

The default I2C address for the peripheral

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Declaration

public byte DefaultI2cAddress { get; }

MeasurementMode

The measurement mode

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Declaration

public Bh1900Nux.MeasurementModes MeasurementMode { get; set; }

FaultQueueDepth

The fault queue depth

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Declaration

public Bh1900Nux.FaultQueue FaultQueueDepth { get; set; }

AlertPolarity

The alert polarity

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Declaration

public Bh1900Nux.Polarity AlertPolarity { get; set; }

AlertIsActive

Is the alert active

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Declaration

public bool AlertIsActive { get; }

LowLimit

The temperature low limit

View Source

Declaration

public Temperature LowLimit { get; set; }

HighLimit

The temperature high limit

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Declaration

public Temperature HighLimit { get; set; }

Methods

Reset()

Reset the sensor

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Declaration

public void Reset()

Sleep()

Set the sensor to sleep state

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Declaration

public void Sleep()

Wake()

Wake the device

View Source

Declaration

public void Wake()

ReadSensor()

Read the temperature

View Source

Declaration

protected override Task<Temperature> ReadSensor()

Returns

System.Threading.Tasks.Task<Meadow.Units.Temperature>: The current temperature value

Implements

• System.IObservable<Meadow.IChangeResult<Meadow.Units.Temperature>>
• System.IDisposable
• Meadow.Peripherals.Sensors.ITemperatureSensor
• Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.Temperature>
• Meadow.Peripherals.Sensors.ISensor<Meadow.Units.Temperature>
• Meadow.Peripherals.Sensors.ISensor
• Meadow.Peripherals.Sensors.ISamplingSensor
• Meadow.Hardware.II2cPeripheral