Meadow.Foundation.Sensors.Distance.A02yyuw

A02yyuw
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

Code Example

A02yyuw a02yyuw;

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

    a02yyuw = new A02yyuw(Device, Device.PlatformOS.GetSerialPortName("COM4"));

    var consumer = A02yyuw.CreateObserver(
        handler: result =>
        {
            Resolver.Log.Info($"Observer: Distance changed by threshold; new distance: {result.New.Centimeters:N1}cm, old: {result.Old?.Centimeters:N1}cm");
        },
        filter: result =>
        {
            if (result.Old is { } old)
            {
                return Math.Abs((result.New - old).Centimeters) > 5.0;
            }
            return false;
        }
    );
    a02yyuw.Subscribe(consumer);

    a02yyuw.Updated += A02yyuw_DistanceUpdated;

    return Task.CompletedTask;
}

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

    var distance = await a02yyuw.Read();
    Resolver.Log.Info($"Initial distance is: {distance.Centimeters:N1}cm / {distance.Inches:N1}in");

    a02yyuw.StartUpdating(TimeSpan.FromSeconds(2));
}

private void A02yyuw_DistanceUpdated(object sender, IChangeResult<Length> e)
{
    Resolver.Log.Info($"Distance: {e.New.Centimeters:N1}cm / {e.New.Inches:N1}in");
}

Sample project(s) available on GitHub

Class A02yyuw

Represents the A02YYUW serial distance sensor

Assembly: A02yyuw.dll

View Source

Declaration

public class A02yyuw : PollingSensorBase<Length>, IObservable<IChangeResult<Length>>, IRangeFinder, ISamplingSensor<Length>, ISensor<Length>, ISensor, ISamplingSensor, ISleepAwarePeripheral, IDisposable

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

Implements:
System.IObservable<Meadow.IChangeResult<Meadow.Units.Length>>, Meadow.Peripherals.Sensors.Distance.IRangeFinder, Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.Length>, Meadow.Peripherals.Sensors.ISensor<Meadow.Units.Length>, Meadow.Peripherals.Sensors.ISensor, Meadow.Peripherals.Sensors.ISamplingSensor, Meadow.ISleepAwarePeripheral, System.IDisposable

Properties

Distance

Distance from sensor to object

View Source

Declaration

public Length? Distance { get; protected set; }

OutOfRangeValue

Value returned when the sensor cannot determine the distance

View Source

Declaration

public Length OutOfRangeValue { get; }

SensorReadTimeOut

The maximum time to wait for a sensor reading

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Declaration

public TimeSpan SensorReadTimeOut { get; set; }

Methods

MeasureDistance()

Start a distance measurement

View Source

Declaration

public void MeasureDistance()

Read()

Convenience method to get the current sensor reading

View Source

Declaration

public override Task<Length> Read()

Returns

System.Threading.Tasks.Task<Meadow.Units.Length>

ReadSensor()

Read the distance from the sensor

View Source

Declaration

protected override Task<Length> ReadSensor()

Returns

System.Threading.Tasks.Task<Meadow.Units.Length>

StartUpdating(TimeSpan?)

Start updating distances

View Source

Declaration

public override void StartUpdating(TimeSpan? updateInterval)

Parameters

Type	Name	Description
System.Nullable<System.TimeSpan>	updateInterval	The interval used to notify external subscribers

StopUpdating()

Stop sampling

View Source

Declaration

public override void StopUpdating()

BeforeSleep(CancellationToken)

Called before the platform goes into Sleep state

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Declaration

public Task BeforeSleep(CancellationToken cancellationToken)

Returns

System.Threading.Tasks.Task

Parameters

Type	Name
System.Threading.CancellationToken	cancellationToken

AfterWake(CancellationToken)

Called after the platform returns to Wake state

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Declaration

public Task AfterWake(CancellationToken cancellationToken)

Returns

System.Threading.Tasks.Task

Parameters

Type	Name
System.Threading.CancellationToken	cancellationToken

Dispose(bool)

Dispose of the object

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Declaration

protected virtual void Dispose(bool disposing)

Parameters

Type	Name	Description
System.Boolean	disposing	Is disposing

Dispose()

Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.

View Source

Declaration

public void Dispose()

Implements

• System.IObservable<Meadow.IChangeResult<Meadow.Units.Length>>
• Meadow.Peripherals.Sensors.Distance.IRangeFinder
• Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.Length>
• Meadow.Peripherals.Sensors.ISensor<Meadow.Units.Length>
• Meadow.Peripherals.Sensors.ISensor
• Meadow.Peripherals.Sensors.ISamplingSensor
• Meadow.ISleepAwarePeripheral
• System.IDisposable