Remarks

Veml7700
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

The TEMT6000 is an I2C ambient light sensor.

Code Example

Veml7700 sensor;

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

    sensor = new Veml7700(Device.CreateI2cBus());
    sensor.DataSource = Veml7700.SensorTypes.Ambient;

    sensor.RangeExceededHigh += (s, a) => Resolver.Log.Info("Too bright to measure");
    sensor.RangeExceededLow += (s, a) => Resolver.Log.Info("Too dim to measure");

    // classical .NET events can also be used:
    sensor.Updated += (sender, result) => Resolver.Log.Info($"Illuminance: {result.New.Lux:n3}Lux");

    return Task.CompletedTask;
}

public override async Task Run()
{
    var conditions = await sensor.Read();

    Resolver.Log.Info("Initial Readings:");
    Resolver.Log.Info($"  Illuminance: {conditions.Lux:n3}Lux");

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

Sample project(s) available on GitHub

Wiring Example

To wire a Veml7700 to your Meadow board, connect the following:

Veml7700	Meadow Pin
3V3	3V3
GND	GND
SCK	D08
SDA	D07

It should look like the following diagram:

Characteristic	Locus
Inheritance	System.Object ObservableBase<Illuminance> SamplingSensorBase<Illuminance> PollingSensorBase<Illuminance> ByteCommsSensorBase<Illuminance> > Veml7700
Implements	ISamplingSensor<Illuminance> ISamplingSensor<Illuminance> IDisposable ILightSensor IDisposable
Inherited Members	ByteCommsSensorBase<Illuminance>.Peripheral ByteCommsSensorBase<Illuminance>.ReadBuffer ByteCommsSensorBase<Illuminance>.WriteBuffer ByteCommsSensorBase<Illuminance>.Init(Int32, Int32) ByteCommsSensorBase<Illuminance>.Dispose(Boolean) ByteCommsSensorBase<Illuminance>.Dispose() PollingSensorBase<Illuminance>.StartUpdating(Nullable<TimeSpan>) PollingSensorBase<Illuminance>.StopUpdating() SamplingSensorBase<Illuminance>.samplingLock SamplingSensorBase<Illuminance>.Updated SamplingSensorBase<Illuminance>.SamplingTokenSource SamplingSensorBase<Illuminance>.Conditions SamplingSensorBase<Illuminance>.IsSampling SamplingSensorBase<Illuminance>.UpdateInterval SamplingSensorBase<Illuminance>.RaiseEventsAndNotify(IChangeResult<>) SamplingSensorBase<Illuminance>.Read() ObservableBase<Illuminance>.observers ObservableBase<Illuminance>.NotifyObservers(IChangeResult<>) Meadow.Foundation.ObservableBase<Illuminance>.Subscribe(IObserver<>) Meadow.Foundation.ObservableBase<Illuminance>.CreateObserver(Action<>, System.Nullable<Predicate<IChangeResult<UNIT>>>)
Namespace	Meadow.Foundation.Sensors.Light
Assembly	Veml7700.dll

Syntax

public class Veml7700 : ByteCommsSensorBase<Illuminance>, ISamplingSensor<Illuminance>, ISamplingSensor<Illuminance>, IDisposable, ILightSensor, IDisposable

Constructors

Veml7700(II2cBus)

Create a new Veml7700 object with the default address

Declaration

public Veml7700(II2cBus i2cBus)

Parameters

Type	Name	Description
II2cBus	i2cBus	The I2C bus

Properties

DataSource

Sensor types Data source

Declaration

public Veml7700.SensorTypes DataSource { get; set; }

Property Value

Type	Description
Veml7700.SensorTypes

Illuminance

Luminosity reading from the TSL2561 sensor.

Declaration

public Illuminance? Illuminance { get; protected set; }

Property Value

Type	Description
System.Nullable<Illuminance>

Methods

RaiseEventsAndNotify(IChangeResult<Illuminance>)

Raise events for subcribers and notify of value changes

Declaration

protected override void RaiseEventsAndNotify(IChangeResult<Illuminance> changeResult)

Parameters

Type	Name	Description
IChangeResult<Illuminance>	changeResult	The updated sensor data

ReadSensor()

Reads data from the sensor

Declaration

protected override Task<Illuminance> ReadSensor()

Returns

Type	Description
Task<Illuminance>	The latest sensor reading

Overrides

Meadow.Foundation.SamplingSensorBase<Illuminance>.ReadSensor()

Events

LuminosityUpdated

Raised when the luminosity value changes

Declaration

public event EventHandler<IChangeResult<Illuminance>> LuminosityUpdated

Event Type

Type	Description
EventHandler<IChangeResult<Illuminance>>

RangeExceededHigh

Raised when the high range is exceeded

Declaration

public event EventHandler RangeExceededHigh

Event Type

Type	Description
EventHandler

RangeExceededLow

Raised when the low range is exceeded

Declaration

public event EventHandler RangeExceededLow

Event Type

Type	Description
EventHandler