Interface IAnalogInputPort

Contract for ports that implement an analog input channel.

Assembly: Meadow.Contracts.dll

View Source

Declaration

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

Properties

VoltageSampleBuffer

Gets the sample buffer.

View Source

Declaration

Voltage[] VoltageSampleBuffer { get; }

ReferenceVoltage

The maximum voltage that the Analog Port can read. Typically 3.3V. This value is used to convert raw ADC values into voltage.

View Source

Declaration

Voltage ReferenceVoltage { 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().

View Source

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.

View Source

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.

View Source

Declaration

int SampleCount { get; }

SampleInterval

Duration between samples when oversampling.

View Source

Declaration

TimeSpan SampleInterval { get; }

Methods

Read()

Gets the current voltage. For frequent reads, use StartUpdating() and StopUpdating() in conjunction with the SampleBuffer.

View Source

Declaration

Task<Voltage> Read()

Returns

System.Threading.Tasks.Task<Meadow.Units.Voltage>: The current voltage.### 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.

View Source

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.

View Source

Declaration

void StopUpdating()

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

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

View Source

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.

View Source

Declaration

event EventHandler<IChangeResult<Voltage>> Updated

Event Type

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