Remarks

ADXL362
Status Not Tested
Source code GitHub
NuGet package Not published

ADXL362 is an ultra-low power, 3-axis MEMS accelerometer that consumes less than 2 μA at a 100 Hz output data rate and 270 nA when in motion triggered wake-up mode.

The ADXL362 is controlled via I2C.

Sample projects available on GitHub

Purchasing

The ADXL362 is available on a small breakout board:

Usage

The ADXL362 can operating in interrupt and polling mode. Polling applications are responsible for determining when a sensor is read. Interrupt applications will be notified when the sensor reading changes by + / - a threshold value.

Wiring Example

Characteristic Locus
Inheritance System.Object > Adxl362
Implements IAccelerometer
Namespace Meadow.Foundation.Sensors.Motion
Assembly Adxl362.dll

Syntax

public class Adxl362 : FilterableChangeObservableBase<AccelerationConditionChangeResult, AccelerationConditions>, IAccelerometer

Constructors

Adxl362(IIODevice, ISpiBus, IPin)

Create a new ADXL362 object using the specified SPI module.

Declaration
public Adxl362(IIODevice device, ISpiBus spiBus, IPin chipSelect)

Parameters

Type Name Description
IIODevice device
ISpiBus spiBus

Spi Bus object
IPin chipSelect

Chip select pin.

Fields

_adxl362

ADXL362 sensor object.

Declaration
protected readonly ISpiPeripheral _adxl362

Field Value

Type Description
ISpiPeripheral

Properties

ActivityDetected

Indicate if any activity has been detected over the specified threshold.

Declaration
public bool ActivityDetected { get; }

Property Value

Type Description
System.Boolean

ActivityInactivityControl

Activity / Inactivity control register (see page 29 of the data sheet).

Declaration
public byte ActivityInactivityControl { get; set; }

Property Value

Type Description
System.Byte

Awake

Indicate if the sensor is awake or inactive.

Declaration
public bool Awake { get; }

Property Value

Type Description
System.Boolean

Conditions

Declaration
public AccelerationConditions Conditions { get; protected set; }

Property Value

Type Description
AccelerationConditions

DataReady

Indicate of data is ready to be read.

Declaration
public bool DataReady { get; }

Property Value

Type Description
System.Boolean

DeviceID

Read the device ID, MEMS ID, Part ID and silicon revision ID and encode the value in a 32-bit integer.

Declaration
public int DeviceID { get; }

Property Value

Type Description
System.Int32

FIFOOverrun

Indicate if the FIFO buffer has overrun (newly generated data is overwriting data already stored in the FIFO buffer.

Declaration
public bool FIFOOverrun { get; }

Property Value

Type Description
System.Boolean

FIFOReady

Indicate if there is any data in the FIFO buffer.

Declaration
public bool FIFOReady { get; }

Property Value

Type Description
System.Boolean

FIFOWatermark

Indicate if there are at least the desired number of samples in the FIFO buffer.

Declaration
public bool FIFOWatermark { get; }

Property Value

Type Description
System.Boolean

FilterControl

Get / set the filter control register (see page 33 of the data sheet).

Declaration
public byte FilterControl { get; set; }

Property Value

Type Description
System.Byte

InactivityDetected

Indicate if the sensor has detected inactivity or a free fall condition.

Declaration
public bool InactivityDetected { get; }

Property Value

Type Description
System.Boolean

IsSampling

Gets a value indicating whether the analog input port is currently sampling the ADC. Call StartSampling() to spin up the sampling process.

Declaration
public bool IsSampling { get; protected set; }

Property Value

Type Description
System.Boolean

true if sampling; otherwise, false.

SelfTest

Set the value of the self test register. Setting this to true will put the device into self test mode, setting this to false will turn off the self test.

Declaration
public bool SelfTest { set; }

Property Value

Type Description
System.Boolean

Status

Read the status register.

Declaration
public byte Status { get; }

Property Value

Type Description
System.Byte

Temperature

Sensor temperature.

Declaration
public double Temperature { get; }

Property Value

Type Description
System.Double

XAcceleration

Acceleration along the X-axis.

Declaration
public float XAcceleration { get; }

Property Value

Type Description
System.Single

Remarks

This property will only contain valid data after a call to Read or after an interrupt has been generated.

YAcceleration

Acceleration along the Y-axis.

Declaration
public float YAcceleration { get; }

Property Value

Type Description
System.Single

Remarks

This property will only contain valid data after a call to Read or after an interrupt has been generated.

ZAcceleration

Acceleration along the Z-axis.

Declaration
public float ZAcceleration { get; }

Property Value

Type Description
System.Single

Remarks

This property will only contain valid data after a call to Read or after an interrupt has been generated.

Methods

ConfigureActivityThreshold(UInt16, Byte)

Configure the activity threshold and activity time. Once configured it will be necessary to set the activity/inactivity control and interrupts if required.

Declaration
public void ConfigureActivityThreshold(ushort threshold, byte numberOfSamples)

Parameters

Type Name Description
System.UInt16 threshold

11-bit unsigned value for the activity threshold.
System.Byte numberOfSamples

Number of consecutive samples that must exceed the threshold

ConfigureInactivityThreshold(UInt16, UInt16)

Configure the inactivity threshold and activity time. Once configured it will be necessary to set the activity/inactivity control and interrupts if required.

Declaration
public void ConfigureInactivityThreshold(ushort threshold, ushort numberOfSamples)

Parameters

Type Name Description
System.UInt16 threshold

11-bit unsigned value for the activity threshold.
System.UInt16 numberOfSamples

Number of consecutive samples that must exceed the threshold

RaiseChangedAndNotify(AccelerationConditionChangeResult)

Declaration
protected void RaiseChangedAndNotify(AccelerationConditionChangeResult changeResult)

Parameters

Type Name Description
AccelerationConditionChangeResult changeResult

Read()

Declaration
public Task<AccelerationConditions> Read()

Returns

Type Description
System.Threading.Tasks.Task<AccelerationConditions>

Reset()

Reset the sensor.

Declaration
public void Reset()

Start()

Start making sensor readings.

Declaration
public void Start()

StartUpdating(Int32)

Declaration
public void StartUpdating(int standbyDuration = 1000)

Parameters

Type Name Description
System.Int32 standbyDuration

Stop()

Stop sensor readings.

Declaration
public void Stop()

StopUpdating()

Declaration
public void StopUpdating()

Update()

Read the sensors and make the readings available through the X, Y and Z properties.

Declaration
public void Update()

Events

Updated

Declaration
public event EventHandler<AccelerationConditionChangeResult> Updated

Event Type

Type Description
System.EventHandler<AccelerationConditionChangeResult>