MMA8491Q Accel Tilt Sensor
This documentation includes installation guidelines and sample code for your hardware.
MMA8491QSensor library is responsible for communicating with the MMA8491Q accel and tilt sensor.
To use the library, add the following using statement to the top of your C# code.
using TurtaIoTHAT;
Then, create an instance of the MMA8491QSensor class.
MMA8491QSensor accel;
Now you're ready to access the library by calling the accel instance.
Initiates the MMA8491Q sensor to get 3D acceleration data and tilt interrupt.
MMA8491QSensor(Modes sensorMode)
Reads the X-axis G value.
double ReadXAxis()
Reads the Y-axis G value.
double ReadYAxis()
Reads the Z-axis G value.
double ReadZAxis()
Reads the X, Y and Z-Axis G values respectively.
double[] ReadXYZAxis()
Reads the tilt state.
bool ReadTiltState()
Notifies on sensor tilt change.
event MMA8491QTiltEventHandler TiltChanged
To clean up the resources used by the class, call the Dispose() method it when the application is closing.
void Dispose()
This method stops the timers and cleans the resources used by the class.
You can copy the example codes from https://github.com/Turta-io/IoTHAT/tree/master/Samples/Windows10IoTCore address. There are two examples of this library.
This application demonstrates reading 3D acceleration data from the sensor.
To run the example:
- 1.Open the sample project you downloaded.
- 2.Make sure "ARM" is selected from the solution platforms selection.
- 3.Deploy the sample to the Raspberry Pi using the "F5" key.
Sample Code
MainPage.xaml.cs
using System.Diagnostics;
using System.Threading;
using Windows.UI.Xaml.Controls;
using TurtaIoTHAT;
namespace MMA8491QAccelSampleApp
{
public sealed partial class MainPage : Page
{
// MMA8491Q Sensor
static MMA8491QSensor accel;
// Sensor timer
Timer sensorTimer;
public MainPage()
{
this.InitializeComponent();
// Initialize sensor and timer
Initialize();
}
private void Initialize()
{
// Create sensor instance
accel = new MMA8491QSensor(MMA8491QSensor.Modes.Accelerometer);
// Configure timer to 2000ms delayed start and 1000ms interval
sensorTimer = new Timer(new TimerCallback(SensorTimerTick), null, 2000, 1000);
}
private static void SensorTimerTick(object state)
{
// Write sensor data to output / immediate window
double[] g = accel.ReadXYZAxis();
Debug.WriteLine("Accel X: " + g[0].ToString("0.00") + "G");
Debug.WriteLine("Accel Y: " + g[1].ToString("0.00") + "G");
Debug.WriteLine("Accel Z: " + g[2].ToString("0.00") + "G");
Debug.WriteLine("-----");
}
}
}
Result
When you run the sample, it prints the 3D acceleration reading to the Visual Studio Output / Immediate Window.
Accel X 0.10G
Accel Y 0.20G
Accel Z 0.30G
-----
To stop the application, use the "Stop" button on the Visual Studio.
This application demonstrates reading tilt interrupts from the sensor.
To run the example:
- 1.Open the sample project you downloaded.
- 2.Make sure "ARM" is selected from the solution platforms selection.
- 3.Deploy the sample to the Raspberry Pi using the "F5" key.
Sample Code
MainPage.xaml.cs
using System.Diagnostics;
using Windows.UI.Xaml.Controls;
using TurtaIoTHAT;
namespace MMA8491QTiltDetectSampleApp
{
public sealed partial class MainPage : Page
{
// MMA8491Q Sensor
static MMA8491QSensor accel;
public MainPage()
{
this.InitializeComponent();
// Initialize sensor and timer
Initialize();
}
private void Initialize()
{
// Create sensor instance
accel = new MMA8491QSensor(MMA8491QSensor.Modes.TiltSensor);
// Subscribe to Tilt Changed event
accel.TiltChanged += TiltChanged;
}
private void TiltChanged(object sender, MMA8491QTiltEventArgs e)
{
// Write tilt state to output / immediate window
Debug.WriteLine(e.TiltDetected ? "Tilt detected." : "No tilt.");
}
}
}
Result
When you run the sample, it prints tilt change interrupts to the Visual Studio Output / Immediate Window.
Tilt deteccted.
No tilt.
To stop the application, use the "Stop" button on the Visual Studio.
Last modified 4yr ago