Meadow.Foundation.Sensors.Distance.Me007ys

Me007ys
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

Code Example

Me007ys me007ys;

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

    me007ys = new Me007ys(Device, Device.PlatformOS.GetSerialPortName("COM1"));

    var consumer = Me007ys.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;
        }
    );
    me007ys.Subscribe(consumer);

    me007ys.Updated += Me007y_DistanceUpdated;

    return Task.CompletedTask;
}

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

    var distance = await me007ys.Read();
    Resolver.Log.Info($"Initial distance is: {distance.Centimeters:N1}cm / {distance.Inches:N1}in");

    me007ys.StartUpdating(TimeSpan.FromSeconds(2));
}

private void Me007y_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 Me007ys

Represents the ME007YS serial distance sensor

Assembly: Me007ys.dll

View Source

Declaration

public class Me007ys : 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

View Source

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

View Source

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

View Source

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