Remarks

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.Address.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 =>
        {
            //c# 8 pattern match syntax. checks for !null and assigns var.
            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

Characteristic	Locus
Inheritance	System.Object ObservableBase<Units.Temperature> SamplingSensorBase<Units.Temperature> PollingSensorBase<Units.Temperature> ByteCommsSensorBase<Units.Temperature> > Bh1900Nux
Implements	ISamplingSensor<Units.Temperature> ISamplingSensor<Units.Temperature> IDisposable ITemperatureSensor
Inherited Members	ByteCommsSensorBase<Units.Temperature>.Peripheral ByteCommsSensorBase<Units.Temperature>.ReadBuffer ByteCommsSensorBase<Units.Temperature>.WriteBuffer ByteCommsSensorBase<Units.Temperature>.Init(Int32, Int32) ByteCommsSensorBase<Units.Temperature>.Dispose(Boolean) ByteCommsSensorBase<Units.Temperature>.Dispose() PollingSensorBase<Units.Temperature>.StartUpdating(Nullable<TimeSpan>) PollingSensorBase<Units.Temperature>.StopUpdating() SamplingSensorBase<Units.Temperature>.samplingLock SamplingSensorBase<Units.Temperature>.Updated SamplingSensorBase<Units.Temperature>.SamplingTokenSource SamplingSensorBase<Units.Temperature>.Conditions SamplingSensorBase<Units.Temperature>.IsSampling SamplingSensorBase<Units.Temperature>.UpdateInterval SamplingSensorBase<Units.Temperature>.RaiseEventsAndNotify(IChangeResult<>) SamplingSensorBase<Units.Temperature>.Read() ObservableBase<Units.Temperature>.observers ObservableBase<Units.Temperature>.NotifyObservers(IChangeResult<>) Meadow.Foundation.ObservableBase<Units.Temperature>.Subscribe(IObserver<>) Meadow.Foundation.ObservableBase<Units.Temperature>.CreateObserver(Action<>, System.Nullable<Predicate<IChangeResult<UNIT>>>)
Namespace	Meadow.Foundation.Sensors.Atmospheric
Assembly	Bh1900Nux.dll

Syntax

public class Bh1900Nux : ByteCommsSensorBase<Units.Temperature>, ISamplingSensor<Units.Temperature>, ISamplingSensor<Units.Temperature>, IDisposable, ITemperatureSensor

Constructors

Bh1900Nux(II2cBus, Bh1900Nux.Address)

Create a new Bh1900Nux object

Declaration

public Bh1900Nux(II2cBus i2cBus, Bh1900Nux.Address address)

Parameters

Type	Name	Description
II2cBus	i2cBus	The I2C bus
Bh1900Nux.Address	address	The I2C address

Bh1900Nux(II2cBus, Byte)

Create a new Bh1900Nux object

Declaration

public Bh1900Nux(II2cBus i2cBus, byte address)

Parameters

Type	Name	Description
II2cBus	i2cBus	The I2C bus
System.Byte	address	The I2C address

Properties

AlertIsActive

Is the alert active

Declaration

public bool AlertIsActive { get; }

Property Value

Type	Description
System.Boolean

AlertPolarity

The alert polarity

Declaration

public Bh1900Nux.Polarity AlertPolarity { get; set; }

Property Value

Type	Description
Bh1900Nux.Polarity

FaultQueueDepth

The fault queue depth

Declaration

public Bh1900Nux.FaultQueue FaultQueueDepth { get; set; }

Property Value

Type	Description
Bh1900Nux.FaultQueue

HighLimit

The temperature high limit

Declaration

public Units.Temperature HighLimit { get; set; }

Property Value

Type	Description
Units.Temperature

LowLimit

The temperture low limit

Declaration

public Units.Temperature LowLimit { get; set; }

Property Value

Type	Description
Units.Temperature

MeasurementMode

The measurement mode

Declaration

public Bh1900Nux.MeasurementModes MeasurementMode { get; set; }

Property Value

Type	Description
Bh1900Nux.MeasurementModes

Temperature

The current temperature

Declaration

public Units.Temperature? Temperature { get; }

Property Value

Type	Description
System.Nullable<Units.Temperature>

Methods

RaiseEventsAndNotify(IChangeResult<Units.Temperature>)

Raise events for subcribers and notify of value changes

Declaration

protected override void RaiseEventsAndNotify(IChangeResult<Units.Temperature> changeResult)

Parameters

Type	Name	Description
IChangeResult<Units.Temperature>	changeResult	The updated sensor data

ReadSensor()

Read the temperature

Declaration

protected override Task<Units.Temperature> ReadSensor()

Returns

Type	Description
Task<Units.Temperature>	The current temperature value

Overrides

Meadow.Foundation.SamplingSensorBase<Units.Temperature>.ReadSensor()

Reset()

Reset the sensor

Declaration

public void Reset()

Sleep()

Set the sensor to sleep state

Declaration

public void Sleep()

Wake()

Wake the device

Declaration

public void Wake()

Events

TemperatureUpdated

Raised when the temperature value changes

Declaration

public event EventHandler<IChangeResult<Units.Temperature>> TemperatureUpdated

Event Type

Type	Description
EventHandler<IChangeResult<Units.Temperature>>