Remarks

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.TemperatureUpdated += (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

Characteristic	Locus
Inheritance	System.Object ObservableBase<Units.Temperature> SamplingSensorBase<Units.Temperature> PollingSensorBase<Units.Temperature> > Thermistor > SteinhartHartCalculatedThermistor
Implements	ISamplingSensor<Units.Temperature> ISamplingSensor<Units.Temperature> ITemperatureSensor
Inherited Members	PollingSensorBase<Units.Temperature>.StartUpdating(Nullable<TimeSpan>) PollingSensorBase<Units.Temperature>.StopUpdating() SamplingSensorBase<Units.Temperature>.samplingLock SamplingSensorBase<Units.Temperature>.Updated SamplingSensorBase<Units.Temperature>.SamplingTokenSource SamplingSensorBase<Units.Temperature>.Conditions SamplingSensorBase<Units.Temperature>.IsSampling SamplingSensorBase<Units.Temperature>.UpdateInterval SamplingSensorBase<Units.Temperature>.ReadSensor() SamplingSensorBase<Units.Temperature>.RaiseEventsAndNotify(IChangeResult<>) SamplingSensorBase<Units.Temperature>.Read() ObservableBase<Units.Temperature>.observers ObservableBase<Units.Temperature>.NotifyObservers(IChangeResult<>) Meadow.Foundation.ObservableBase<Units.Temperature>.Subscribe(IObserver<>) Meadow.Foundation.ObservableBase<Units.Temperature>.CreateObserver(Action<>, System.Nullable<Predicate<IChangeResult<UNIT>>>)
Namespace	Meadow.Foundation.Sensors.Temperature
Assembly	Thermistor.dll

Syntax

public abstract class Thermistor : PollingSensorBase<Units.Temperature>, ISamplingSensor<Units.Temperature>, ISamplingSensor<Units.Temperature>, ITemperatureSensor

Constructors

Thermistor(IAnalogInputPort)

Creates a new Thermistor object using the provided analog input

Declaration

protected Thermistor(IAnalogInputPort analogInput)

Parameters

Type	Name	Description
IAnalogInputPort	analogInput	The analog input reading the thermistor voltage divider output

Properties

AnalogInput

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

Declaration

protected IAnalogInputPort AnalogInput { get; }

Property Value

Type	Description
IAnalogInputPort

NominalResistance

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

Declaration

public abstract Resistance NominalResistance { get; }

Property Value

Type	Description
Resistance

NominalTemperature

The nominal temperature for the nominal resistance, typically 25C.

Declaration

public virtual Units.Temperature NominalTemperature { get; }

Property Value

Type	Description
Units.Temperature

Temperature

The temperature from the last reading.

Declaration

public Units.Temperature? Temperature { get; protected set; }

Property Value

Type	Description
System.Nullable<Units.Temperature>

Events

TemperatureUpdated

Raised when the temperature is updated

Declaration

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

Event Type

Type	Description
EventHandler<IChangeResult<Units.Temperature>>