Remarks

LightSensor
Status
Source code	GitHub
NuGet package

Code Example

LightSensor sensor;

public override Task Initialize()
{
    Console.WriteLine("Initialize...");

    sensor = new LightSensor(Device.Pins.A01);

    var consumer = LightSensor.CreateObserver(
        handler: result => Console.WriteLine($"Observer filter satisfied: {result.New.Millivolts:N2}mV, old: {result.Old?.Millivolts:N2}mV"),
        filter: result =>
        {
            if (result.Old is { } old)
            { //c# 8 pattern match syntax. checks for !null and assigns var.
                return (result.New - old).Abs().Millivolts > 500;
            }
            return false;
        });

    sensor.Subscribe(consumer);

    sensor.Updated += (sender, result) => 
    {
        Console.WriteLine($"Voltage Changed, new: {result.New.Millivolts:N2}mV, old: {result.Old?.Millivolts:N2}mV");
    };

    return Task.CompletedTask;
}

public override async Task Run()
{
    var result = await sensor.Read();
    Console.WriteLine($"Initial read: {result.Millivolts:N2}mV");

    sensor.StartUpdating(TimeSpan.FromMilliseconds(1000));
}

Sample project(s) available on GitHub

Wiring Example

LightSensor	Meadow Pin
GND	GND
VCC	3.3V
RX	D01
TX	D00

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

Syntax

public class LightSensor : AnalogSamplingBase, ISamplingSensor<Voltage>

Constructors

LightSensor(IAnalogInputPort)

Creates a new LightSensor driver

Declaration

public LightSensor(IAnalogInputPort port)

Parameters

Type	Name	Description
IAnalogInputPort	port

LightSensor(IPin, Int32, Nullable<TimeSpan>, Nullable<Voltage>)

Creates a new LightSensor driver

Declaration

public LightSensor(IPin pin, int sampleCount = 5, TimeSpan? sampleInterval = null, Voltage? voltage = null)

Parameters

Type	Name	Description
IPin	pin
System.Int32	sampleCount
System.Nullable<TimeSpan>	sampleInterval
System.Nullable<Voltage>	voltage