Meadow.Foundation.Sensors.Temperature.Thermistor

Thermistor
Status
Source code	GitHub
NuGet package

Code Example

private SteinhartHartCalculatedThermistor thermistor;

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

    thermistor = new SteinhartHartCalculatedThermistor(Device.CreateAnalogInputPort(Device.Pins.A00), new Resistance(10, Meadow.Units.Resistance.UnitType.Kiloohms));

    var consumer = SteinhartHartCalculatedThermistor.CreateObserver(
        handler: result =>
        {
            Resolver.Log.Info($"Temperature New Value {result.New.Fahrenheit:N1}F/{result.New.Celsius:N1}C");
            Resolver.Log.Info($"Temperature Old Value {result.Old?.Fahrenheit:N1}F/{result.Old?.Celsius:N1}C");
        },
        filter: null
    );
    thermistor.Subscribe(consumer);

    thermistor.Updated += (object sender, IChangeResult<Meadow.Units.Temperature> e) =>
    {
        Resolver.Log.Info($"Temperature Updated: {e.New.Fahrenheit:N1}F/{e.New.Celsius:N1}C");
    };

    return Task.CompletedTask;
}

public override async Task Run()
{
    var temp = await thermistor.Read();
    Resolver.Log.Info($"Current temperature: {temp.Fahrenheit:N1}F/{temp.Celsius:N1}C");

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

Sample project(s) available on GitHub

Class Thermistor

Thermistor temperature sensor object

Assembly: Thermistor.dll

View Source

Declaration

public abstract class Thermistor : SamplingSensorBase<Temperature>, IObservable<IChangeResult<Temperature>>, ITemperatureSensor, ISamplingSensor<Temperature>, ISensor<Temperature>, ISensor, ISamplingSensor

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

Derived:
Meadow.Foundation.Sensors.Temperature.SteinhartHartCalculatedThermistor

Implements:
System.IObservable<Meadow.IChangeResult<Meadow.Units.Temperature>>, Meadow.Peripherals.Sensors.ITemperatureSensor, Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.Temperature>, Meadow.Peripherals.Sensors.ISensor<Meadow.Units.Temperature>, Meadow.Peripherals.Sensors.ISensor, Meadow.Peripherals.Sensors.ISamplingSensor

Properties

AnalogInputPort

The analog input port used to determine output voltage of the voltage divider circuit

View Source

Declaration

protected IAnalogInputPort AnalogInputPort { get; }

NominalResistance

The nominal resistance of the thermistor (e.g. 10kOhm for a 10k thermistor)

View Source

Declaration

public abstract Resistance NominalResistance { get; }

NominalTemperature

The nominal temperature for the nominal resistance, typically 25C

View Source

Declaration

public virtual Temperature NominalTemperature { get; }

Temperature

The temperature from the last reading

View Source

Declaration

public Temperature? Temperature { get; protected set; }

Methods

StartUpdating(TimeSpan?)

Starts updating the sensor on the updateInterval frequency specified

View Source

Declaration

public override void StartUpdating(TimeSpan? updateInterval = null)

Parameters

Type	Name	Description
System.Nullable<System.TimeSpan>	updateInterval	A TimeSpan that specifies how long to
wait between readings

StopUpdating()

Stops sampling the sensor

View Source

Declaration

public override void StopUpdating()

Events

TemperatureUpdated

Raised when the temperature is updated

View Source

Declaration

public event EventHandler<IChangeResult<Temperature>> TemperatureUpdated

Event Type

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

Implements

• System.IObservable<Meadow.IChangeResult<Meadow.Units.Temperature>>
• Meadow.Peripherals.Sensors.ITemperatureSensor
• Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.Temperature>
• Meadow.Peripherals.Sensors.ISensor<Meadow.Units.Temperature>
• Meadow.Peripherals.Sensors.ISensor
• Meadow.Peripherals.Sensors.ISamplingSensor