Remarks

Tmp102
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

The TMP102 is a temperature sensor capable of reading the current temperature with an accuracy of 0.5C over the range of -25C to 85C with a total range of -40C to 125C.

Purchasing

TMP102 sensors are available on a breakout board from the following suppliers:

• Sparkfun TMP102 Breakout Board

The TMP102 temperature sensor can operate in interrupt or polling mode.

Code Example

Tmp102 tmp102;

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

    tmp102 = new Tmp102(Device.CreateI2cBus());

    var consumer = Tmp102.CreateObserver(
        handler: result =>
        {
            Resolver.Log.Info($"Temperature New Value { result.New.Celsius}C");
            Resolver.Log.Info($"Temperature Old Value { result.Old?.Celsius}C");
        },
        filter: null
    );
    tmp102.Subscribe(consumer);

    tmp102.TemperatureUpdated += (object sender, IChangeResult<Meadow.Units.Temperature> e) =>
    {
        Resolver.Log.Info($"Temperature Updated: {e.New.Celsius:N2}C");
    };

    return Task.CompletedTask;
}

public override async Task Run()
{
    var temp = await tmp102.Read();
    Resolver.Log.Info($"Current temperature: {temp.Celsius} C");

    tmp102.StartUpdating(TimeSpan.FromSeconds(1));
}

Sample project(s) available on GitHub

Interrupt Mode

The example below will check the temperature every second. An interrupt will be raised if the difference in temperature between the last reported reading and the current reading is greater than + / - 0.1 °C.

public class MeadowApp : App<F7Micro, MeadowApp>
{
    public MeadowApp()
    {
        Console.WriteLine("TMP102 Interrupt Sample");

        // Create a new TMP102 object, check the temperature every
        // 1s and report any changes grater than +/- 0.1C.
        var tmp102 = new TMP102(updateInterval: 1000, temperatureChangeNotificationThreshold: 0.1F);

        // Hook up the interrupt handler.
        tmp102.TemperatureChanged += (s, e) =>
        {
            Console.WriteLine("Temperature: " + e.CurrentValue.ToString("f2"));
        };

        // Now put the main program to sleep as the interrupt handler
        // above deals with processing the sensor data.
        Thread.Sleep(Timeout.Infinite);
    }
}

Polling Mode

The following application reads the temperature from the TMP102 sensor every second and displays the results in the debug console:

public class MeadowApp : App<F7Micro, MeadowApp>
{
    public MeadowApp()
    {
      gi  Console.WriteLine("TMP102 Test");
        var tmp102 = new TMP102();
        while (true)
        {
            Console.WriteLine("Temperature: " + tmp102.Temperature.ToString("f2"));
            Thread.Sleep(1000);
        }
    }
}

Sample projects available on GitHub

Wiring Example

TMP102 sensors can be connected to Meadow using only four connections:

Characteristic	Locus
Inheritance	System.Object ObservableBase<Units.Temperature> SamplingSensorBase<Units.Temperature> PollingSensorBase<Units.Temperature> ByteCommsSensorBase<Units.Temperature> > Tmp102
Implements	ISamplingSensor<Units.Temperature> ISamplingSensor<Units.Temperature> IDisposable ITemperatureSensor
Inherited Members	ByteCommsSensorBase<Units.Temperature>.Peripheral ByteCommsSensorBase<Units.Temperature>.ReadBuffer ByteCommsSensorBase<Units.Temperature>.WriteBuffer ByteCommsSensorBase<Units.Temperature>.Init(Int32, Int32) ByteCommsSensorBase<Units.Temperature>.Dispose(Boolean) ByteCommsSensorBase<Units.Temperature>.Dispose() 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>.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	Tmp102.dll

Syntax

public class Tmp102 : ByteCommsSensorBase<Units.Temperature>, ISamplingSensor<Units.Temperature>, ISamplingSensor<Units.Temperature>, IDisposable, ITemperatureSensor

Constructors

Tmp102(II2cBus, Byte)

Create a new TMP102 object using the default configuration for the sensor.

Declaration

public Tmp102(II2cBus i2cBus, byte address = null)

Parameters

Type	Name	Description
II2cBus	i2cBus	The I2CBus
System.Byte	address	I2C address of the sensor.

Properties

SensorResolution

Get / set the resolution of the sensor.

Declaration

public Tmp102.Resolution SensorResolution { get; set; }

Property Value

Type	Description
Tmp102.Resolution

Temperature

The temperature from the last reading.

Declaration

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

Property Value

Type	Description
System.Nullable<Units.Temperature>

Methods

RaiseChangedAndNotify(IChangeResult<Units.Temperature>)

Raise change events for subscribers

Declaration

protected void RaiseChangedAndNotify(IChangeResult<Units.Temperature> changeResult)

Parameters

Type	Name	Description
IChangeResult<Units.Temperature>	changeResult	The change result with the current sensor data

ReadSensor()

Update the Temperature property

Declaration

protected override Task<Units.Temperature> ReadSensor()

Returns

Type	Description
Task<Units.Temperature>

Overrides

Meadow.Foundation.SamplingSensorBase<Units.Temperature>.ReadSensor()

Events

TemperatureUpdated

Raised when the temperature value changes

Declaration

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

Event Type

Type	Description
EventHandler<IChangeResult<Units.Temperature>>