Meadow.Foundation.Sensors.Environmental.MiniPID2

MiniPID2
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

Code Example

MiniPID2 sensor;

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

    sensor = new MiniPID2(Device.Pins.A01, MiniPID2.MiniPID2Type.PPB_WR);

    var consumer = MiniPID2.CreateObserver(
        handler: result =>
        {
            Resolver.Log.Info($"Observer: VOC concentration changed by threshold; new: {result.New.PartsPerBillion:N1}ppm");
        },
        filter: result =>
        {
            if (result.Old is { } oldCon &&
                result.New is { } newCon)
            {
                return Math.Abs((newCon - oldCon).PartsPerMillion) > 10;
            }
            return false;
        }
    );

    sensor?.Subscribe(consumer);

    if (sensor != null)
    {
        sensor.Updated += (sender, result) =>
        {
            Resolver.Log.Info($"  VOC Concentration: {result.New.PartsPerMillion:N1}ppm");
        };
    }

    sensor?.StartUpdating(TimeSpan.FromSeconds(2));

    return base.Initialize();
}

Sample project(s) available on GitHub

Class MiniPID2

Represents an IonScience MiniPID2 analog photoionisation (PID) Volatile Organic Compounds (VOC) sensor

Assembly: MiniPID2.dll

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Declaration

public class MiniPID2 : SamplingSensorBase<Concentration>, IObservable<IChangeResult<Concentration>>, IVOCConcentrationSensor, ISamplingSensor<Concentration>, ISensor<Concentration>, ISensor, ISamplingSensor, IDisposable

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

Implements:
System.IObservable<Meadow.IChangeResult<Meadow.Units.Concentration>>, Meadow.Peripherals.Sensors.Environmental.IVOCConcentrationSensor, Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.Concentration>, Meadow.Peripherals.Sensors.ISensor<Meadow.Units.Concentration>, Meadow.Peripherals.Sensors.ISensor, Meadow.Peripherals.Sensors.ISamplingSensor, System.IDisposable

Properties

VOCConcentration

The current VOC concentration value

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Declaration

public Concentration? VOCConcentration { get; protected set; }

MiniPID2DeviceType

The MiniPID2 device type

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Declaration

public MiniPID2.MiniPID2Type MiniPID2DeviceType { get; protected set; }

AnalogInputPort

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Declaration

protected IAnalogInputPort AnalogInputPort { get; }

IsDisposed

Is the object disposed

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Declaration

public bool IsDisposed { get; }

Methods

SetOffsetForSensor(Voltage, MiniPID2Type)

Set the sensor voltage offset Useful for compensating for air conditions

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Declaration

public void SetOffsetForSensor(Voltage offset, MiniPID2.MiniPID2Type sensorType)

Parameters

Type	Name	Description
Meadow.Units.Voltage	offset	Offset voltage
Meadow.Foundation.Sensors.Environmental.MiniPID2.MiniPID2Type	sensorType	The sensor to change

GetOffsetForSensor(MiniPID2Type)

Get the voltage offset for a sensor

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Declaration

public Voltage GetOffsetForSensor(MiniPID2.MiniPID2Type sensorType)

Returns

Meadow.Units.Voltage: The offset as voltage

Parameters

Type	Name	Description
Meadow.Foundation.Sensors.Environmental.MiniPID2.MiniPID2Type	sensorType	The sensor

ReadSensor()

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

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Declaration

protected override Task<Concentration> ReadSensor()

Returns

System.Threading.Tasks.Task<Meadow.Units.Concentration>: The concentration averages of the given sample count### StartUpdating(TimeSpan?) Starts updating the sensor on the updateInterval frequency specified

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Declaration

public override void StartUpdating(TimeSpan? updateInterval = null)

Parameters

Type	Name
System.Nullable<System.TimeSpan>	updateInterval

StopUpdating()

Stops sampling the concentration

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Declaration

public override void StopUpdating()

VoltageToConcentration(Voltage)

Converts voltage to Concentration

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Declaration

protected Concentration VoltageToConcentration(Voltage voltage)

Returns

Meadow.Units.Concentration: Concentration

Parameters

Type	Name
Meadow.Units.Voltage	voltage

Dispose()

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

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Declaration

public void Dispose()

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

Implements

• System.IObservable<Meadow.IChangeResult<Meadow.Units.Concentration>>
• Meadow.Peripherals.Sensors.Environmental.IVOCConcentrationSensor
• Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.Concentration>
• Meadow.Peripherals.Sensors.ISensor<Meadow.Units.Concentration>
• Meadow.Peripherals.Sensors.ISensor
• Meadow.Peripherals.Sensors.ISamplingSensor
• System.IDisposable