Remarks

Th02
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

Code Example

Th02 sensor;

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

    sensor = new Th02(Device.CreateI2cBus());

    var consumer = Th02.CreateObserver(
        handler: result =>
        {
            Resolver.Log.Info($"Observer: Temp changed by threshold; new temp: {result.New.Temperature?.Celsius:N2}C, old: {result.Old?.Temperature?.Celsius:N2}C");
        },
        filter: result =>
        {
            //c# 8 pattern match syntax. checks for !null and assigns var.
            if (result.Old is { } old)
            {
                return (
                (result.New.Temperature.Value - old.Temperature.Value).Abs().Celsius > 0.5);
            }
            return false;
        }
    );
    sensor.Subscribe(consumer);

    sensor.Updated += (sender, result) =>
    {
        Resolver.Log.Info($"  Temperature: {result.New.Temperature?.Celsius:N2}C");
        Resolver.Log.Info($"  Relative Humidity: {result.New.Humidity?.Percent:N2}%");
    };

    return Task.CompletedTask;
}

public override async Task Run()
{
    var conditions = await sensor.Read();
    Resolver.Log.Info($"Temperature: {conditions.Temperature?.Celsius}°C, Relative Humidity: {conditions.Humidity?.Percent}%");

    sensor.StartUpdating(TimeSpan.FromSeconds(1));
}

Sample project(s) available on GitHub

Wiring Example

To wire a Th02 to your Meadow board, connect the following:

Th02	Meadow Pin
GND	GND
SCL	D08 (SCL)
SDA	D07 (SDA)
VCC	3V3

Characteristic	Locus
Inheritance	System.Object ObservableBase<System.ValueTuple<System.Nullable<Units.Temperature>, System.Nullable<RelativeHumidity>>> SamplingSensorBase<System.ValueTuple<System.Nullable<Units.Temperature>, System.Nullable<RelativeHumidity>>> PollingSensorBase<System.ValueTuple<System.Nullable<Units.Temperature>, System.Nullable<RelativeHumidity>>> ByteCommsSensorBase<System.ValueTuple<System.Nullable<Units.Temperature>, System.Nullable<RelativeHumidity>>> > Th02
Implements	ISamplingSensor<System.ValueTuple<System.Nullable<Units.Temperature>, System.Nullable<RelativeHumidity>>> ISamplingSensor<System.ValueTuple<System.Nullable<Units.Temperature>, System.Nullable<RelativeHumidity>>> IDisposable ITemperatureSensor IHumiditySensor
Inherited Members	ByteCommsSensorBase<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>.Peripheral ByteCommsSensorBase<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>.ReadBuffer ByteCommsSensorBase<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>.WriteBuffer ByteCommsSensorBase<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>.Init(Int32, Int32) ByteCommsSensorBase<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>.Dispose(Boolean) ByteCommsSensorBase<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>.Dispose() PollingSensorBase<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>.StartUpdating(Nullable<TimeSpan>) PollingSensorBase<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>.StopUpdating() SamplingSensorBase<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>.samplingLock SamplingSensorBase<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>.Updated SamplingSensorBase<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>.SamplingTokenSource SamplingSensorBase<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>.Conditions SamplingSensorBase<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>.IsSampling SamplingSensorBase<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>.UpdateInterval SamplingSensorBase<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>.ReadSensor() SamplingSensorBase<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>.RaiseEventsAndNotify(IChangeResult<>) SamplingSensorBase<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>.Read() ObservableBase<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>.observers ObservableBase<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>.NotifyObservers(IChangeResult<>) Meadow.Foundation.ObservableBase<System.ValueTuple<System.Nullable<Units.Temperature>, System.Nullable<RelativeHumidity>>>.Subscribe(IObserver<>) Meadow.Foundation.ObservableBase<System.ValueTuple<System.Nullable<Units.Temperature>, System.Nullable<RelativeHumidity>>>.CreateObserver(Action<>, System.Nullable<Predicate<IChangeResult<UNIT>>>)
Namespace	Meadow.Foundation.Sensors.Atmospheric
Assembly	Th02.dll

Syntax

public class Th02 : ByteCommsSensorBase<(Units.Temperature? Temperature, RelativeHumidity? Humidity)>, ISamplingSensor<(Units.Temperature? Temperature, RelativeHumidity? Humidity)>, ISamplingSensor<(Units.Temperature? Temperature, RelativeHumidity? Humidity)>, IDisposable, ITemperatureSensor, IHumiditySensor

Constructors

Th02(II2cBus, Byte)

Provide a mechanism for reading the temperature and humidity from a Th02 temperature / humidity sensor

Declaration

public Th02(II2cBus i2cBus, byte address = null)

Parameters

Type	Name	Description
II2cBus	i2cBus
System.Byte	address

Properties

Humidity

Last value read from the Pressure sensor.

Declaration

public RelativeHumidity? Humidity { get; }

Property Value

Type	Description
System.Nullable<RelativeHumidity>

Temperature

Last value read from the Temperature sensor.

Declaration

public Units.Temperature? Temperature { get; }

Property Value

Type	Description
System.Nullable<Units.Temperature>

Methods

RaiseEventsAndNotify(IChangeResult<(Nullable<Units.Temperature> Temperature, Nullable<RelativeHumidity> Humidity)>)

Raise all change events for subscribers

Declaration

protected override void RaiseEventsAndNotify(IChangeResult<(Units.Temperature? Temperature, RelativeHumidity? Humidity)> changeResult)

Parameters

Type	Name	Description
IChangeResult<System.ValueTuple<System.Nullable<Units.Temperature>, System.Nullable<RelativeHumidity>>>	changeResult	temperature and humidity

ReadSensor()

Calculates the compensated pressure and temperature.

Declaration

protected override Task<(Units.Temperature? Temperature, RelativeHumidity? Humidity)> ReadSensor()

Returns

Type	Description
Task<System.ValueTuple<System.Nullable<Units.Temperature>, System.Nullable<RelativeHumidity>>>

Overrides

Meadow.Foundation.SamplingSensorBase<System.ValueTuple<System.Nullable<Units.Temperature>, System.Nullable<RelativeHumidity>>>.ReadSensor()

Events

HumidityUpdated

Event raised when the humidity changes

Declaration

public event EventHandler<IChangeResult<RelativeHumidity>> HumidityUpdated

Event Type

Type	Description
EventHandler<IChangeResult<RelativeHumidity>>

TemperatureUpdated

Event raised when the temperature changes

Declaration

public event EventHandler<IChangeResult<Units.Temperature>> TemperatureUpdated

Event Type

Type	Description
EventHandler<IChangeResult<Units.Temperature>>