Meadow.Foundation.Sensors.Light.Veml7700

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:

Class Veml7700

High Accuracy Ambient Light Sensor

Assembly: Veml7700.dll

View Source

Declaration

public class Veml7700 : ByteCommsSensorBase<Illuminance>, IObservable<IChangeResult<Illuminance>>, ILightSensor, ISamplingSensor<Illuminance>, ISensor<Illuminance>, ISensor, ISamplingSensor, II2cPeripheral, IDisposable

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

Implements:
System.IObservable<Meadow.IChangeResult<Meadow.Units.Illuminance>>, Meadow.Peripherals.Sensors.Light.ILightSensor, Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.Illuminance>, Meadow.Peripherals.Sensors.ISensor<Meadow.Units.Illuminance>, Meadow.Peripherals.Sensors.ISensor, Meadow.Peripherals.Sensors.ISamplingSensor, Meadow.Hardware.II2cPeripheral, System.IDisposable

Properties

Illuminance

Luminosity reading from the TSL2561 sensor.

View Source

Declaration

public Illuminance? Illuminance { get; protected set; }

DataSource

Sensor types Data source

View Source

Declaration

public Veml7700.SensorTypes DataSource { get; set; }

DefaultI2cAddress

The default I2C address for the peripheral

View Source

Declaration

public byte DefaultI2cAddress { get; }

Methods

ReadSensor()

Reads data from the sensor

View Source

Declaration

protected override Task<Illuminance> ReadSensor()

Returns

System.Threading.Tasks.Task<Meadow.Units.Illuminance>: The latest sensor reading### SetPower(bool) Set power mode

View Source

Declaration

public void SetPower(bool on)

Parameters

Type	Name
System.Boolean	on

Events

RangeExceededHigh

Raised when the high range is exceeded

View Source

Declaration

public event EventHandler RangeExceededHigh

Event Type

System.EventHandler

RangeExceededLow

Raised when the low range is exceeded

View Source

Declaration

public event EventHandler RangeExceededLow

Event Type

System.EventHandler

Implements

• System.IObservable<Meadow.IChangeResult<Meadow.Units.Illuminance>>
• Meadow.Peripherals.Sensors.Light.ILightSensor
• Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.Illuminance>
• Meadow.Peripherals.Sensors.ISensor<Meadow.Units.Illuminance>
• Meadow.Peripherals.Sensors.ISensor
• Meadow.Peripherals.Sensors.ISamplingSensor
• Meadow.Hardware.II2cPeripheral
• System.IDisposable