Interface IObservableAnalogInputPort

Contract for ports that implement an observable, sampling analog input channel.

Assembly: Meadow.Contracts.dll

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Declaration

public interface IObservableAnalogInputPort : IAnalogInputPort, IAnalogPort, IPort<IAnalogChannelInfo>, IDisposable, IObservable<IChangeResult<Voltage>>

Properties

VoltageSampleBuffer

Gets the sample buffer.

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Declaration

Voltage[] VoltageSampleBuffer { get; }

Voltage

Gets the average value of the values in the buffer. Use in conjunction with StartSampling() for long-running analog sampling. For occasional sampling, use Read().

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Declaration

Voltage Voltage { get; }

UpdateInterval

A System.TimeSpan that specifies how long to wait between readings. This value influences how often Updated events are raised and IObservable consumers are notified.

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Declaration

TimeSpan UpdateInterval { get; }

SampleCount

Number of samples to take per reading. If > 0, then the port will take multiple readings and automatically average them to reduce noise, a process known as oversampling.

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Declaration

int SampleCount { get; }

SampleInterval

Duration between samples when oversampling.

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Declaration

TimeSpan SampleInterval { get; }

Methods

StartUpdating(TimeSpan?)

Starts continuously sampling the analog port.

This method also starts raising Updated events and notifying IObservable subscribers. Use the updateInterval parameter to specify how often events and notifications are raised.

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Declaration

void StartUpdating(TimeSpan? updateInterval = null)

Parameters

Type	Name	Description
System.Nullable<System.TimeSpan>	updateInterval	The interval between readings.

StopUpdating()

Stops sampling the analog port.

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Declaration

void StopUpdating()

CreateObserver(Action<IChangeResult<Voltage>>, Predicate<IChangeResult<Voltage>>?)

Creates an observer for monitoring changes in the analog input voltage.

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Declaration

public static FilterableChangeObserver<Voltage> CreateObserver(Action<IChangeResult<Voltage>> handler, Predicate<IChangeResult<Voltage>>? filter = null)

Returns

Meadow.FilterableChangeObserver<UNIT>: The created observer.

Parameters

Type	Name	Description
System.Action<Meadow.IChangeResult<Meadow.Units.Voltage>>	handler	The handler to be called when a change occurs.
System.Predicate<Meadow.IChangeResult<Meadow.Units.Voltage>>	filter	An optional filter predicate for filtering changes.

Events

Updated

Raised when the value of the reading changes.

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Declaration

event EventHandler<IChangeResult<Voltage>> Updated

Event Type

System.EventHandler<Meadow.IChangeResult<Meadow.Units.Voltage>>