Remarks

Hih6130
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

The HIH6130 sensor allows the reading of the relative humidity and temperature via I2C.

Code Example

Hih6130? sensor;

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

    sensor = new Hih6130(Device.CreateI2cBus());

    var consumer = Hih6130.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?.Temperature is { } oldTemp &&
                result.Old?.Humidity is { } oldHumidity &&
                result.New.Temperature is { } newTemp &&
                result.New.Humidity is { } newHumidity)
            {
                return ((newTemp - oldTemp).Abs().Celsius > 0.5 &&
                        (newHumidity - oldHumidity).Percent > 0.05);
            }
            return false;
        }
    );
    sensor.Subscribe(consumer);

    sensor.Updated += (sender, result) =>
    {
        Resolver.Log.Info($"  Temperature: {result?.New.Temperature?.Celsius:F1}°C");
        Resolver.Log.Info($"  Relative Humidity: {result?.New.Humidity?.Percent:F1}%");
    };

    return Task.CompletedTask;
}

public override async Task Run()
{
    if(sensor == null) { return; }

    var result = await sensor.Read();
    Resolver.Log.Info("Initial Readings:");
    Resolver.Log.Info($"  Temperature: {result.Temperature?.Celsius:F1}°C");
    Resolver.Log.Info($"  Relative Humidity: {result.Humidity:F1}%");

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

Sample project(s) available on GitHub

Wiring Example

The HIH6130 requires only four connections between Meadow and the breakout board.

Meadow Pin	Sensor Pin	Wire Color
3.3V	Vcc	Red
GND	GND	Black
SC	SCK	Blue
SD	SDC	White

Characteristic	Locus
Inheritance	System.Object > Hih6130
Implements	ITemperatureSensor IHumiditySensor
Namespace	Meadow.Foundation.Sensors.Atmospheric
Assembly	Hih6130.dll

Syntax

public class Hih6130 : ByteCommsSensorBase<(Units.Temperature? Temperature, RelativeHumidity? Humidity)>, ITemperatureSensor, IHumiditySensor

Constructors

Hih6130(II2cBus, Byte)

Create a new HIH6130 object using the default parameters for the component.

Declaration

public Hih6130(II2cBus i2cBus, byte address = null)

Parameters

Type	Name	Description
II2cBus	i2cBus	I2C bus (default = 100 KHz).
System.Byte	address	Address of the HIH6130 (default = 0x27).

Properties

Humidity

The humidity, in percent relative humidity, from the last reading..

Declaration

public RelativeHumidity? Humidity { get; }

Property Value

Type	Description
System.Nullable<RelativeHumidity>

Temperature

The temperature, from the last reading.

Declaration

public Units.Temperature? Temperature { get; }

Property Value

Type	Description
System.Nullable<Units.Temperature>

Methods

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

Inheritance-safe way to raise events and notify observers.

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

ReadSensor()

Force the sensor to make a reading and update the relevant properties.

Declaration

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

Returns

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

Events

HumidityUpdated

Raised when the humidity value changes

Declaration

public event EventHandler<IChangeResult<RelativeHumidity>> HumidityUpdated

Event Type

Type	Description
EventHandler<IChangeResult<RelativeHumidity>>

TemperatureUpdated

Raised when the temperature value changes

Declaration

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

Event Type

Type	Description
EventHandler<IChangeResult<Units.Temperature>>