Meadow.Foundation.Sensors.Motion.Adxl335

Adxl335
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

The ADXL335 is a low power accelerometer capable of measuring +/- 3g of acceleration along three axes. The ADXL335 is controlled via I2C.

Code Example

Adxl335 sensor;

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

    // create the sensor driver
    sensor = new Adxl335(Device.Pins.A00, Device.Pins.A01, Device.Pins.A02, null);

    // classical .NET events can also be used:
    sensor.Updated += (sender, result) =>
    {
        Resolver.Log.Info($"Accel: [X:{result.New.X.MetersPerSecondSquared:N2}," +
            $"Y:{result.New.Y.MetersPerSecondSquared:N2}," +
            $"Z:{result.New.Z.MetersPerSecondSquared:N2} (m/s^2)]");
    };

    // Example that uses an IObservable subscription to only be notified when the filter is satisfied
    var consumer = Adxl335.CreateObserver(
        handler: result => Resolver.Log.Info($"Observer: [x] changed by threshold; new [x]: X:{result.New.X:N2}, old: X:{result.Old?.X:N2}"),
        // only notify if there's a greater than 1G change in the Z direction
        filter: result =>
        {
            if (result.Old is { } old)
            {
                return ((result.New - old).Z > new Acceleration(1, AU.Gravity));
            }
            return false;
        });
    sensor.Subscribe(consumer);

    return Task.CompletedTask;
}

public async override Task Run()
{
    var result = await sensor.Read();
    Resolver.Log.Info("Initial Readings:");
    Resolver.Log.Info($"Accel: [X:{result.X.MetersPerSecondSquared:N2}," +
        $"Y:{result.Y.MetersPerSecondSquared:N2}," +
        $"Z:{result.Z.MetersPerSecondSquared:N2} (m/s^2)]");

    sensor.StartUpdating(TimeSpan.FromMilliseconds(500));
}

Sample project(s) available on GitHub

Code Sample

public class MeadowApp : App<F7Micro, MeadowApp>
{
    Adxl335 sensor;

    public MeadowApp()
    {
        sensor = new Adxl335(Device, Device.Pins.A01, Device.Pins.A02, Device.Pins.A03, 500);

        sensor.AccelerationChanged += Sensor_AccelerationChanged;
    }

    private void Sensor_AccelerationChanged(object sender, Meadow.Foundation.Sensors.SensorVectorEventArgs e)
    {
        Console.WriteLine($"X: {e.CurrentValue.X}, Y: {e.CurrentValue.Y}, Z: {e.CurrentValue.Z}");
    }
}

Sample projects available on GitHub

Wiring Example

Class Adxl335

Driver for the ADXL335 triple axis accelerometer +/- 3g

Assembly: Adxl3xx.dll

View Source

Declaration

public class Adxl335 : Adxl3xxBase, IObservable<IChangeResult<Acceleration3D>>, IAccelerometer, ISamplingSensor<Acceleration3D>, ISensor<Acceleration3D>, ISensor, ISamplingSensor, IDisposable

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

Implements:
System.IObservable<Meadow.IChangeResult<Meadow.Units.Acceleration3D>>, Meadow.Peripherals.Sensors.Motion.IAccelerometer, Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.Acceleration3D>, Meadow.Peripherals.Sensors.ISensor<Meadow.Units.Acceleration3D>, Meadow.Peripherals.Sensors.ISensor, Meadow.Peripherals.Sensors.ISamplingSensor, System.IDisposable

Implements

• System.IObservable<Meadow.IChangeResult<Meadow.Units.Acceleration3D>>
• Meadow.Peripherals.Sensors.Motion.IAccelerometer
• Meadow.Peripherals.Sensors.ISamplingSensor<Meadow.Units.Acceleration3D>
• Meadow.Peripherals.Sensors.ISensor<Meadow.Units.Acceleration3D>
• Meadow.Peripherals.Sensors.ISensor
• Meadow.Peripherals.Sensors.ISamplingSensor
• System.IDisposable