Remarks

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

Code Example

AdafruitMPRLS sensor;

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

    sensor = new AdafruitMPRLS(Device.CreateI2cBus());
    sensor.Updated += PressureSensor_Updated;

    return Task.CompletedTask;
}

public override Task Run()
{
    sensor.StartUpdating(TimeSpan.FromSeconds(1));

    return Task.CompletedTask;
}

void PressureSensor_Updated(object sender, IChangeResult<(Pressure? Pressure, Pressure? RawPsiMeasurement)> result)
{
    Resolver.Log.Info($"New pressure PSI: {result.New.Pressure?.Psi}, Old pressure PSI: {result.Old?.Pressure?.Psi}");

    Resolver.Log.Info($"Pressure in Pascal: {result.New.Pressure?.Pascal}");

    Resolver.Log.Info($"Raw sensor value: {result.New.RawPsiMeasurement?.Psi}");
}

Sample project(s) available on GitHub

Wiring Example

To wire a Adafruit MPRLS Sensor to your Meadow board, connect the following:

MPRLS	Meadow Pin
GND	GND
VCC	3.3V
SCL	D08
SDA	D07

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

Syntax

public class AdafruitMPRLS : ByteCommsSensorBase<(Pressure? Pressure, Pressure? RawPsiMeasurement)>, ISamplingSensor<(Pressure? Pressure, Pressure? RawPsiMeasurement)>, ISamplingSensor<(Pressure? Pressure, Pressure? RawPsiMeasurement)>, IDisposable, IBarometricPressureSensor

Constructors

AdafruitMPRLS(II2cBus)

Represents an Adafruit MPRLS Ported Pressure Sensor

Declaration

public AdafruitMPRLS(II2cBus i2cbus)

Parameters

Type	Name	Description
II2cBus	i2cbus	I2Cbus connected to the sensor

Properties

HasMemoryIntegrityFailed

Set by the sensor, to tell us whether or not there's an issue with its own memory.

Declaration

public bool HasMemoryIntegrityFailed { get; set; }

Property Value

Type	Description
System.Boolean

InternalMathSaturated

Indicates the sensor has reached its pressure limit.

Declaration

public bool InternalMathSaturated { get; set; }

Property Value

Type	Description
System.Boolean

IsDeviceBusy

Set by the sensor, to tell us it's busy.

Declaration

public bool IsDeviceBusy { get; set; }

Property Value

Type	Description
System.Boolean

IsDevicePowered

Set by the sensor, to tell us it has power.

Declaration

public bool IsDevicePowered { get; set; }

Property Value

Type	Description
System.Boolean

Pressure

Returns the current pressure reading

Declaration

public Pressure? Pressure { get; }

Property Value

Type	Description
System.Nullable<Pressure>

RawPsiMeasurement

Returns the current raw pressure value in pounds per square inch (PSI)

Declaration

public Pressure? RawPsiMeasurement { get; }

Property Value

Type	Description
System.Nullable<Pressure>

Methods

RaiseEventsAndNotify(IChangeResult<(Nullable<Pressure> Pressure, Nullable<Pressure> RawPsiMeasurement)>)

Notify subscribers of PressureUpdated event handler

Declaration

protected override void RaiseEventsAndNotify(IChangeResult<(Pressure? Pressure, Pressure? RawPsiMeasurement)> changeResult)

Parameters

Type	Name	Description
IChangeResult<System.ValueTuple<System.Nullable<Pressure>, System.Nullable<Pressure>>>	changeResult

ReadSensor()

Convenience method to get the current Pressure. For frequent reads, use StartSampling() and StopSampling() in conjunction with the SampleBuffer.

Declaration

protected override Task<(Pressure? Pressure, Pressure? RawPsiMeasurement)> ReadSensor()

Returns

Type	Description
Task<System.ValueTuple<System.Nullable<Pressure>, System.Nullable<Pressure>>>

Overrides

Meadow.Foundation.SamplingSensorBase<System.ValueTuple<System.Nullable<Pressure>, System.Nullable<Pressure>>>.ReadSensor()

Events

PressureUpdated

Raised when a new reading has been made. Events will only be raised while the driver is updating. To start, call the StartUpdating() method.

Declaration

public event EventHandler<IChangeResult<Pressure>> PressureUpdated

Event Type

Type	Description
EventHandler<IChangeResult<Pressure>>