Characteristic Locus
Inheritance System.Object > ADXL362
Inherited Members System.Object.ToString() System.Object.Equals(System.Object) System.Object.Equals(System.Object, System.Object) System.Object.ReferenceEquals(System.Object, System.Object) System.Object.GetHashCode() System.Object.GetType() System.Object.MemberwiseClone()
Namespace Meadow.Foundation.Sensors.Motion
Assembly ADXL362.dll

Syntax

public class ADXL362

Remarks

ADXL362 is an ultralow 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.

Purchasing

The ADXL362 is available on a small breakout board:

Examples

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.

Interrupt Example

The application below demonstrates how to connect an interrupt handler to the ADXL362 sensor and display changes only when the acceleration changes in the x, y or z axis by more than the acceleration threshold (default is 5 units):

using System.Threading;
using Meadow;
using Meadow.Foundation.Sensors.Motion;

namespace ADXL362_Sample
{
    public class Program
    {
        static IApp _app; 
        public static void Main()
        {
            _app = new App();
        }
    }

    public class App : AppBase<F7Micro, App>
    {
        public App ()
        {
            Console.WriteLine("\n\n");
            Console.WriteLine("ADXL362 Interrupt Example.");
            Console.WriteLine("--------------------------");

            var adxl362 = new ADXL362();
            Console.WriteLine("Device ID: " + adxl362.DeviceID);

            // Attach an interrupt handler.            
            adxl362.AccelerationChanged += (s, e) =>
            {
                Console.WriteLine(
                    "X: " + e.CurrentValue.X.ToString() +
                    ", Y: " + e.CurrentValue.Y.ToString() +
                    ", Z: " + e.CurrentValue.Z.ToString());
            };

            // Interrupts are attached so power on the sensor.
            adxl362.SetPowerState(false, false, true, false, ADXL362.Frequency.EightHz);

            // Put Meadow to sleep as the interrupt handler will deal 
            // with changes in acceleration.
            Thread.Sleep(Timeout.Infinite);
        }
    }
}

Polling Example

The sensor is put into polling mode by setting the updateInterval in the constructor to 0 milliseconds. The following application will read the sensor and output to the debug console every 500 milliseconds:

using System.Threading;
using Meadow;
using Meadow.Foundation.Sensors.Motion;

namespace ADXL362_Sample
{
    public class Program
    {
        static IApp _app; 
        public static void Main()
        {
            _app = new App();
        }
    }

    public class App : AppBase<F7Micro, App>
    {
        public App ()
        {
            Console.WriteLine("\n\n");
            Console.WriteLine("ADXL362 Polling Example.");
            Console.WriteLine("------------------------");

            ADXL362 adxl362 = new ADXL362(updateInterval: 0);
            Console.WriteLine("Device ID: " + adxl362.DeviceID);

            adxl362.SetPowerState(false, false, true, false, ADXL362.Frequency.EightHz);
            while (true)
            {
                adxl362.Update();
                Console.WriteLine(
                    "X: " + adxl362.X.ToString() + 
                    ", Y: " + adxl362.Y.ToString() + 
                    ", Z: " + adxl362.Z.ToString());
                Thread.Sleep(500);
            }
        }
    }
}
Example Circuit

Constructors

View Source

ADXL362(IIODevice, ISpiBus, IPin, UInt16)

Create a new ADXL362 object using the specified SPI module.

Declaration
public ADXL362(IIODevice device, ISpiBus spiBus, IPin chipSelect, ushort speed = 10)

Parameters

Type Name Description
IIODevice device
ISpiBus spiBus

Spi Bus object

IPin chipSelect

Chip select pin.

System.UInt16 speed

Fields

View Source

_adxl362

ADXL362 sensor object.

Declaration
protected readonly ISpiPeripheral _adxl362

Field Value

Type Description
ISpiPeripheral

Properties

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ActivityDetected

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

Declaration
public bool ActivityDetected { get; }

Property Value

Type Description
System.Boolean
View Source

ActivityInactivityControl

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

Declaration
public byte ActivityInactivityControl { get; set; }

Property Value

Type Description
System.Byte
View Source

Awake

Indicate if the sensor is awake or inactive.

Declaration
public bool Awake { get; }

Property Value

Type Description
System.Boolean
View Source

DataReady

Indicate of data is ready to be read.

Declaration
public bool DataReady { get; }

Property Value

Type Description
System.Boolean
View Source

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
View Source

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
View Source

FIFOReady

Indicate if there is any data in the FIFO buffer.

Declaration
public bool FIFOReady { get; }

Property Value

Type Description
System.Boolean
View Source

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
View Source

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
View Source

InactivityDetected

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

Declaration
public bool InactivityDetected { get; }

Property Value

Type Description
System.Boolean
View Source

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
View Source

Status

Read the status register.

Declaration
public byte Status { get; }

Property Value

Type Description
System.Byte
View Source

Temperature

Sensor temperature.

Declaration
public double Temperature { get; }

Property Value

Type Description
System.Double
View Source

X

X-axis sensor reading.

Declaration
public short X { get; }

Property Value

Type Description
System.Int16

Remarks

Read must be called before this property is valid.

View Source

Y

Y-axis sensor reading.

Declaration
public short Y { get; }

Property Value

Type Description
System.Int16

Remarks

Read must be called before this property is valid.

View Source

Z

Z-axis sensor reading.

Declaration
public short Z { get; }

Property Value

Type Description
System.Int16

Remarks

Read must be called before this property is valid.

Methods

View Source

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

View Source

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

View Source

ConfigureInterrupts(IIODevice, Byte, IPin, Byte, IPin)

Configure the interrupts for the ADXL362.

Declaration
public void ConfigureInterrupts(IIODevice device, byte interruptMap1, IPin interruptPin1, byte interruptMap2 = 0, IPin interruptPin2 = null)

Parameters

Type Name Description
IIODevice device
System.Byte interruptMap1

Bit mask for interrupt pin 1

IPin interruptPin1

Pin connected to interrupt pin 1 on the ADXL362.

System.Byte interruptMap2

Bit mask for interrupt pin 2

IPin interruptPin2

Pin connected to interrupt pin 2 on the ADXL362.

View Source

DisplayRegisters()

Display the register contents.

Declaration
public void DisplayRegisters()
View Source

Reset()

Reset the sensor.

Declaration
public void Reset()
View Source

Start()

Start making sensor readings.

Declaration
public void Start()
View Source

Stop()

Stop sensor readings.

Declaration
public void Stop()
View Source

Update()

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

Declaration
public void Update()

Events

View Source

AccelerationChanged

Event to be raised when the acceleration is greater than the activity registers.

Declaration
public event SensorVectorEventHandler AccelerationChanged

Event Type

Type Description
SensorVectorEventHandler