Android Question Magnetic sensor filter...

[Spectre]

Sorry for the question .... you can filter or compensate for the magnetic sensor so that there are continuous fluctuations of values?
best regards... spectre.

 

[Erel]

Do you want to get "smoother" results from the magnetic sensor?

 

[Spectre]

Hi Erel...
You would get more uniform data(smoother). and stable situation.

You would get more linear data. and stable situation.

 

[Erel]

You can use a "moving average" method to make the data smoother: http://en.wikipedia.org/wiki/Moving_average

It is quite simple to implement. You can use a List to hold n values and then remove the first item and add a new item each time.

 

[Spectre]

Hi Erel....
May "Filter"....

 Sub MovingAVG(Magnetic As Int)
  Dim x As Int
   
     
      Dim MagData As List  'store mag raw data to sensor
   
        MagData.Initialize
        MagData.Add(Magnetic)
        Dim  maDuration As Int = 30 'length of  average for calculate
        Dim MagList As List
        MagList.Initialize
        Dim MayAvg As Int 'storage for values and average
        For x  = 0 To MagData.size - 1 'iterate through random data
            MagList.Add( MagData.Get(x)) 'insert into list
            MayAvg = 0 'reset and calculate the avg
                For y = 0 To MagList.size - 1
                    MayAvg = MayAvg + MagList.Get(y) 'ad values
                Next
            MayAvg = MayAvg / MagList.size 'divide by the count
            Log (MayAvg)
            Return MayAvg
            If MagList.size = maDuration Then
                MagList.RemoveAt(MagList.size - 1) 'remove  oldest value on List
            End If
        Next
    End Sub

 

[Erel]

I believe that there is a mistake in this code. You should remove the first item: MagList.RemoveAt(0). This is the oldest value.

 

[Spectre]

Ummmmmm... I'm not sure ... I try to check ...


I'm not sure ... I try to check ...

 

[Spectre]

I checked ... in any case continue to get data too variable ...