Meadow.Foundation.Sensors.Environmental.DFRobotGravityDOMeter

DFRobotGravityDOMeter
Status
Source code	GitHub
NuGet package

Code Example

DFRobotGravityDOMeter sensor;

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

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

    // Example that uses an IObservable subscription to only be notified when the saturation changes
    var consumer = DFRobotGravityDOMeter.CreateObserver(
        handler: result =>
        {
            string oldValue = (result.Old is { } old) ? $"{old.MilligramsPerLiter:n0}" : "n/a";
            string newValue = $"{result.New.MilligramsPerLiter:n0}";
            Resolver.Log.Info($"New: {newValue}mg/l, Old: {oldValue}mg/l");
        },
        filter: null
    );
    sensor.Subscribe(consumer);

    // optional classical .NET events can also be used:
    sensor.Updated += (sender, result) =>
    {
        string oldValue = (result.Old is { } old) ? $"{old.MilligramsPerLiter}mg/l" : "n/a";
        Resolver.Log.Info($"Updated - New: {result.New.MilligramsPerLiter:n0}mg/l, Old: {oldValue}");
    };

    return Task.CompletedTask;
}

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

    await ReadSensor();

    sensor.StartUpdating(TimeSpan.FromSeconds(2));
}

protected async Task ReadSensor()
{
    var concentration = await sensor.Read();
    Resolver.Log.Info($"Initial concentration: {concentration.MilligramsPerLiter:N0}mg/l");
}

Sample project(s) available on GitHub

Class DFRobotGravityDOMeter

DFRobot Analog Gravity Dissolved Oxygen Meter

Assembly: DFRobotGravityDOMeter.dll

View Source

Declaration

public class DFRobotGravityDOMeter : SamplingSensorBase<ConcentrationInWater>, IObservable<IChangeResult<ConcentrationInWater>>, IDissolvedOxygenConcentrationSensor, ISamplingSensor<ConcentrationInWater>, ISensor<ConcentrationInWater>, ISensor, ISamplingSensor

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

Implements:
System.IObservable<Meadow.IChangeResult<Meadow.Units.ConcentrationInWater>>, Meadow.Peripherals.Sensors.Environmental.IDissolvedOxygenConcentrationSensor, Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.ConcentrationInWater>, Meadow.Peripherals.Sensors.ISensor<Meadow.Units.ConcentrationInWater>, Meadow.Peripherals.Sensors.ISensor, Meadow.Peripherals.Sensors.ISamplingSensor

Properties

WaterTemperature

The current water temperature (default 25C)

View Source

Declaration

public Temperature WaterTemperature { get; set; }

CalibrationAt25C

The calibration value for the sensor at 25C (default 1.6V)

View Source

Declaration

public Voltage CalibrationAt25C { get; set; }

AnalogInputPort

Returns the analog input port

View Source

Declaration

protected IAnalogInputPort AnalogInputPort { get; }

Concentration

Last concentration value read from the sensor

View Source

Declaration

public ConcentrationInWater? Concentration { get; protected set; }

Methods

GetCurrentVoltage()

Get the current voltage, useful for calibration

View Source

Declaration

public Task<Voltage> GetCurrentVoltage()

Returns

System.Threading.Tasks.Task<Meadow.Units.Voltage>

ReadSensor()

Reads data from the sensor

View Source

Declaration

protected override Task<ConcentrationInWater> ReadSensor()

Returns

System.Threading.Tasks.Task<Meadow.Units.ConcentrationInWater>: The latest sensor reading### StartUpdating(TimeSpan?) Starts continuously sampling the sensor

View Source

Declaration

public override void StartUpdating(TimeSpan? updateInterval)

Parameters

Type	Name
System.Nullable<System.TimeSpan>	updateInterval

StopUpdating()

Stops sampling the sensor

View Source

Declaration

public override void StopUpdating()

Implements

• System.IObservable<Meadow.IChangeResult<Meadow.Units.ConcentrationInWater>>
• Meadow.Peripherals.Sensors.Environmental.IDissolvedOxygenConcentrationSensor
• Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.ConcentrationInWater>
• Meadow.Peripherals.Sensors.ISensor<Meadow.Units.ConcentrationInWater>
• Meadow.Peripherals.Sensors.ISensor
• Meadow.Peripherals.Sensors.ISamplingSensor