Meadow.Foundation.Sensors.Moisture.Capacitive 1.3.0

Meadow.Foundation.Sensors.Moisture.Capacitive

Analog capacitive soil moisture sensor

The Capacitive library is designed for the Wilderness Labs Meadow .NET IoT platform and is part of Meadow.Foundation

The Meadow.Foundation peripherals library is an open-source repository of drivers and libraries that streamline and simplify adding hardware to your C# .NET Meadow IoT application.

For more information on developing for Meadow, visit developer.wildernesslabs.co, to view all of Wilderness Labs open-source projects, including samples, visit github.com/wildernesslabs

Usage

Capacitive capacitive;

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

    capacitive = new Capacitive(
        Device.Pins.A00,
        minimumVoltageCalibration: new Voltage(2.84f),
        maximumVoltageCalibration: new Voltage(1.63f)
    );

    // Example that uses an IObservable subscription to only be notified when the humidity changes by filter defined.
    var consumer = Capacitive.CreateObserver(
        handler: result =>
        {
            string oldValue = (result.Old is { } old) ? $"{old:n2}" : "n/a"; // C# 8 pattern matching
            Resolver.Log.Info($"Subscribed - " +
                $"new: {result.New}, " +
                $"old: {oldValue}");
        },
        filter: null
    );
    capacitive.Subscribe(consumer);

    // classical .NET events can also be used:
    capacitive.HumidityUpdated += (sender, result) =>
    {
        string oldValue = (result.Old is { } old) ? $"{old:n2}" : "n/a"; // C# 8 pattern matching
        Resolver.Log.Info($"Updated - New: {result.New}, Old: {oldValue}");
    };

    //==== One-off reading use case/pattern
    ReadSensor().Wait();

    capacitive.StartUpdating(TimeSpan.FromMilliseconds(1000));

    return Task.CompletedTask;
}

protected async Task ReadSensor()
{
    var humidity = await capacitive.Read();
    Resolver.Log.Info($"Initial humidity: {humidity:N2}C");
}