Remarks
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 MeadowApp()
{
Console.WriteLine("Initializing");
// create the sensor driver
sensor = new Adxl335(Device, Device.Pins.A00, Device.Pins.A01, Device.Pins.A02, null);
// classical .NET events can also be used:
sensor.Updated += (sender, result) => {
Console.WriteLine($"Accel: [X:{result.New.X.MetersPerSecondSquared:N2}," +
$"Y:{result.New.Y.MetersPerSecondSquared:N2}," +
$"Z:{result.New.Z.MetersPerSecondSquared:N2} (m/s^2)]");
};
// Example that uses an IObservable subscription to only be notified when the filter is satisfied
var consumer = Adxl335.CreateObserver(
handler: result => Console.WriteLine($"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) { //c# 8 pattern match syntax. checks for !null and assigns var.
return ((result.New - old).Z > new Acceleration(1, AU.Gravity));
}
return false;
});
sensor.Subscribe(consumer);
//==== one-off read
ReadConditions().Wait();
// start updating
sensor.StartUpdating(TimeSpan.FromMilliseconds(500));
}
protected async Task ReadConditions()
{
var result = await sensor.Read();
Console.WriteLine("Initial Readings:");
Console.WriteLine($"Accel: [X:{result.X.MetersPerSecondSquared:N2}," +
$"Y:{result.Y.MetersPerSecondSquared:N2}," +
$"Z:{result.Z.MetersPerSecondSquared:N2} (m/s^2)]");
}
Sample project(s) available on GitHub
Code Sample
public class MeadowApp : App<F7Micro, MeadowApp>
{
Adxl335 sensor;
public MeadowApp()
{
sensor = new Adxl335(Device, Device.Pins.A01, Device.Pins.A02, Device.Pins.A03, 500);
sensor.AccelerationChanged += Sensor_AccelerationChanged;
}
private void Sensor_AccelerationChanged(object sender, Meadow.Foundation.Sensors.SensorVectorEventArgs e)
{
Console.WriteLine($"X: {e.CurrentValue.X}, Y: {e.CurrentValue.Y}, Z: {e.CurrentValue.Z}");
}
}
Sample projects available on GitHub
Purchasing
The ADXL335 sensor can be purchased on a breakout board from the following suppliers:
Wiring Example
Syntax
public class Adxl335 : Adxl3xxBase, IAccelerometer
Constructors
Adxl335(IAnalogInputController, IPin, IPin, IPin, Nullable<Voltage>)
Create a new ADXL335 sensor object.
Declaration
public Adxl335(IAnalogInputController device, IPin xPin, IPin yPin, IPin zPin, Voltage? supplyVoltage)
Parameters
Type | Name | Description |
---|---|---|
IAnalogInputController | device | Device that has the analog pins. |
IPin | xPin | Analog pin connected to the X axis output from the ADXL335 sensor. |
IPin | yPin | Analog pin connected to the Y axis output from the ADXL335 sensor. |
IPin | zPin | Analog pin connected to the Z axis output from the ADXL335 sensor. |
System.Nullable<Voltage> | supplyVoltage | The voltage supplied to the sensor. Defaults to 3.3V if null. |