Windows Mobile Unified Sensor API

Source code checked in, #76924

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Source code checked in, #76923

Project Collection Service Accounts — Mon, 01 Oct 2012 21:23:54 GMT

Checked in by server upgrade

New Post: HTC device with WM 6.x, accelerometer, GPS & light sensor?

TTRCmedia — Tue, 02 Aug 2011 20:30:12 GMT

Hi there!

I´m just planning on a program that will be using the accelerometer of a HTC device running Windows Mobile 6.x. I will have to buy a device for testing, so I´m looking for a used (=possibly cheap) one. It must have internal GPS and an accelerometer. I also have an idea for using the light sensor - wich one would be the best for this, if there is any that has all those features?

Thanks,
Danyel

New Post: Keep Landscape screen B7610

abo — Mon, 07 Mar 2011 10:53:55 GMT

Hi all,

Could anyone know how to place the mobile B7610 always is landscape mode that looks like its VideoEditor app?
If our app is deactivated, it should be rollback old state before.

Thanks,
abo

New Post: test apps in emulator

illusion86 — Fri, 08 Oct 2010 11:57:10 GMT

Hi,

I am new to mobile apps development. I would like to use this API in a new application and I have some dificulties. I use VS2008. Is there any way of runnig the test application you provided in an wm6.1 mobile emulator? How can this API be tested outside a real device? Is there lets say a HTC HD emulator to install in VS2008?

Thanks in advance!

Source code checked in, #49966

_TFSSERVICE — Mon, 19 Jul 2010 20:19:27 GMT

Checked in by server upgrade

New Post: Samsung B7610

oipaz — Tue, 18 May 2010 12:55:56 GMT

In your experience is there a chance that this API works on Samsung's B7610 phone?

I tried to use http://forum.xda-developers.com/showthread.php?t=494267 (that application uses code from this project) with no luck

Thanks a lot

Andrea

New Post: HTC HD2 Compass Sensor (Revealed?)

uzi1 — Sat, 08 May 2010 18:51:55 GMT

Hello,

I read a lot of articles on these sensors today, tryed this API, also my own (C++ only, I don't like managed code vary much). Because I have got HTC HD2, and it has a compass.... just guess what I'm thinking about...
I've found that HTCSensorOpen() with DWORD parameter of 3, returns valid HANDLE to a sensor, not currently present in the API. So a little investigation gives nice results.

Set that structure:

struct COMPASSDATA {
    SHORT raw[5];
};

and call these:

COMPASSDATA cd;
HANDLE sensor = HTCSensorOpen(3)
DWORD retCode = HTCSensorGetDataOutput(sensor, &cd);
SHORT NorthEscape = cd.raw[4];//the angle in degrees from the north pole
HTCSensorClose(sensor);

this gives the angle from Y axis to the north magnetic pole. 100% working, compared with built-in compass application. I Have no idea what other values do, but they are definitely SHORTs (every second byte becomes 0 quite often), and they are definitely 5 in total.

Hope to be of use

Nick

New Post: htc hd2

kaansengul — Tue, 04 May 2010 21:01:23 GMT

Does it work for HTC HD2?

New Post: gsensor moves on it's own?

Smetad_Anarkist — Tue, 02 Mar 2010 19:48:19 GMT

Hello

I'm writing a program that uses the gsensor on my HTC HD2. And for some reason the sensor seems to move, even though it's lying perfectly still on my table. When running the ball demo, the ball is rolling around without anybody touching the phone. I've calibrated the sensor with the built in calibration tool. But I still get this random movements.

Is it supposed to do this, or have I missed something?

Patch Uploaded: #5206

iamspv — Mon, 08 Feb 2010 10:44:50 GMT

iamspv has uploaded a patch.

Description:
LG GM750 accelerometer sensor support

New Post: solution for LG GM750 accelerometer

iamspv — Wed, 03 Feb 2010 16:09:10 GMT

This solution is based on the Samsung sensor class, modified to meet the peculiarities of the LG GM750.

First of all, the import of the DeviceIoControl in NativeMethods.cs must be modified such way dwIoControlCode is type uint, and the buffers are byte:

 [DllImport("coredll", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern bool DeviceIoControl(IntPtr hDevice, uint dwIoControlCode, [In] byte[] inBuffer, int nInBufferSize, [Out] byte[] outBuffer, int nOutBufferSize, ref int pBytesReturned, IntPtr lpOverlapped);

After a long time dissassembling the accelsensor.dll and and a lot of trial and error testing I came to this conclusion that works:

The constant that starts/stops data output becomes:

        const uint ACCOnRot = 0x1014EE8;
        const uint ACCOffRot = 0x1014EE8;
and for reading values:
const uint ACCReadValues = 0x1014F10;




The difference between start and stop comes from the input given in DeviceIoControl method as follows:

        public static LGAccSensor Create()
        {
            DeviceIoControl(ACCOnRot, new byte[1] {1}, new byte[4] );
            return new LGAccSensor();
        }
        protected override void Dispose(bool disposing)
        {
            base.Dispose(disposing);
            DeviceIoControl(ACCOffRot, new byte[1] {0}, new byte[1] );
        }

The DeviceIoControl inside the accelerometer class becomes

 public static void DeviceIoControl(uint controlCode, byte[] inBuffer, byte[] outBuffer)
        {


                IntPtr file = NativeMethods.CreateFile("ACC1:", 0, 0, IntPtr.Zero, ECreationDisposition.OpenExisting, 0, IntPtr.Zero);
                if (file == (IntPtr)(-1))
                    throw new InvalidOperationException("Unable to Create File");

                try
                {

                    int bytesReturned = 0;
                    int inSize = sizeof(byte) * inBuffer.Length;
                    int outSize = sizeof(byte) * outBuffer.Length;
                    if (!NativeMethods.DeviceIoControl(file, controlCode, inBuffer, inSize, outBuffer, outSize, ref bytesReturned, IntPtr.Zero))
                            throw new InvalidOperationException("Unable to perform operation.");

                  
                }

                finally
                {
                    NativeMethods.CloseHandle(file);
                }      
        }


Note that the accelerometer device is called ACC1:.

Further the method that returns the three component vector becomes

        public override GVector GetGVector()
        {
            byte[] outBuffer = new byte[4];
            DeviceIoControl(ACCReadValues, new byte[1] {1}, outBuffer);
            GVector ret = new GVector();
          
            
            int accx = outBuffer[2];
            if (accx <=31)
                ret.X = accx/2.17;
            else
                ret.X = (accx-64)*0.47;
            ret.X = -ret.X;
            int accy = outBuffer[1] ;
            if (accy <=31)
                ret.Y =  accy/2.17;
            else
                ret.Y = (accy - 64) * 0.47;

            int accz = outBuffer[0] ;
            if (accz <=31)
                ret.Z = accz/2.17;
            else
                ret.Z = (accz - 64) * 0.47;
            double somefactor = 1;
            return ret.Scale(somefactor);
        }
Note that the when called with AccReadValues parameter, the DeviceIoControl returns three bytes each of them containing a signed 6 bit 2's complement value.
Basicly there are values on 6 bit ranging from -32 to +31. In the docs below there are tables that put in correspondence these values with acceleration in range -1.5g +1.5g which are the limits of the device. The code I wrote returns acceleration in meters/second2 where 1g=9.8 m/s2
That information I extracted from the technical specifications of the MMA7660FC accelerometer, as found at
http://www.comtech.com.cn/pdf/FSL-MMA7660FC.pdf. Also, the type of the accelerometer circuit is found in the service manual (I only found the service manual for LG GM730 which is pretty close).
Please, update the library with this code.
Enjoy!

New Post: Proximity sensor into the API?

buckley10 — Wed, 03 Feb 2010 15:03:58 GMT

No news?

New Post: Unable to run samples

Zbyl — Thu, 28 Jan 2010 15:20:08 GMT

You have to deploy the project. Go to Build > Configuration Manager... and select all projects to build and to deploy, in both debug and release.

New Post: G-Sensor Help

webdude12 — Tue, 26 Jan 2010 21:28:20 GMT

I need some help. I am brand new to Visual Studio and C#. I am a long time PHP programmer that has beginning to play with C# and windows mobile. I have some classic Visual Basic 6 experience, but not a lot.

My problem is the documentation for this API is basically non-exsistance. And the Sample code for the G-Sensor is confusing to a newbie like me. While I am sure the sample code was developed to show the power of the API, when reading it over and trying to figure out where the values are calculated, makes me want to throw my phone through a wall.

I have been able to look at sample codes for other functions (i.e. change registry value, gps, etc) and been able to follow them fairly effiecently.

I am hoping that maybe someone will provide simple code, that will just display the values on the screen is a super simple manner. i.e.

X Vector: 0.0
Y Vector: 0.0
Z Vector: 0.0
Nav Data: 0
Light Sensor: 1
Stlyus Sensor: 1

It can be something as simple as just updating the Text on a label. :-) I am smart enough to know how to intrupt the values from there... and it hopefully it will help me learn more about this crazy thing called C#

New Post: sensors.dll with VB.net 2008

tube — Mon, 25 Jan 2010 09:51:19 GMT

Just wanted to contribute some code because I did not find it somewhere else on the net. This is to access the sensors data with vb.net.
You need to compile the sensors.dll (VC.net) and reference it in your vb.net project first!

Imports Sensors

Public Class Gsensor
    Dim mySensor As IGSensor = GSensorFactory.CreateGSensor


    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        Dim mySensor As IGSensor = GSensorFactory.CreateGSensor()
        Dim vx, vy, vz, vv
        Dim gvector = mySensor.GetGVector()
        Label1.Text = gvector.ToString() & " " & mySensor.Orientation
        vv = gvector.ToString()
        vx = Trim(Mid(vv, 3, InStr(vv, "Y=") - 3))

        vy = Trim(Mid(vv, InStr(vv, "Y=") + 2, InStr(vv, "Z=") - InStr(vv, "Y=") - 3))

        vz = Trim(Mid(vv, InStr(vv, "Z=") + 2, Len(vv) - (InStr(vv, "Z="))))

        Label2.Text = vx
        Label3.Text = vy
        Label4.Text = vz

        tbx.Value = Val(vx)
        tby.Value = Val(vy)
        tbz.Value = Val(vz)

    End Sub

    Private Sub MenuItem1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem1.Click
        Timer1.Enabled = True
    End Sub

    Private Sub MenuItem2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem2.Click
        Timer1.Enabled = False
        mySensor.Dispose()
    End Sub
End Class

T.u.b.e.

New Post: LG Eigen (GM730 - GM735) accelometer

ghaluk — Sun, 03 Jan 2010 17:25:37 GMT

LG GM730 has an accelometer rotating the screen wfor messaging and picture reviewing in landscape.

Can the same sensor be used to play sensor games developed for HTC, samsung touch PDAs?

New Post: High frequency GSensor polling on HTC devices

AdamDawes — Wed, 23 Dec 2009 13:55:37 GMT

I recently noticed that if the GSensor on my Touch Pro2 is queried more than around about 25 times per second, it stops providing useful data back and just returns the most recent vector over and over again. As my project was updating at a higher frequency than this, it presented a bit of a problem.

I implemented a fix for this into my copy of the code, which I thought I'd share in case anyone else found it useful. This limits the GSensor polling to a maximum of 25 times per second, regardless of how frequently the GetGVector() function is called. If calls are within 1/25th of the last poll, the last-polled vector is returned without querying the sensor again. Once sufficient time has elapsed, the next call will actually interrogate the sensor.

The change requires the following variables to be added at class level to the HTCSensor.cs file:

        private GVector _lastVector;
        private int _lastSampleTicks;

Once these have been added, the GetGVector function can be modified as follows:

        public override GVector GetGVector()
        {
            // The GSensor freezes up when inundated with requests.
            // Ensure that at least 1/25th of a second has passed since we were
            // last interrogated. If not, return the most recently retrieved value.
            if (Environment.TickCount - _lastSampleTicks < (1000 / 25) && _lastVector.Length != 0)
            {
                return _lastVector;
            }

            GVector ret = new GVector();
            HTCGSensorData data = GetRawSensorData();
            ret.X = data.TiltX;
            ret.Y = data.TiltY;
            ret.Z = data.TiltZ;
            // HTC's Sensor returns a vector which is around 1000 in length on average..
            // but it really depends on how the device is oriented.
            // When simply face up, my Diamond returns a vector of around 840 in length.
            // While face down, it returns a vector of around 1200 in length.
            // The vector direction is fairly accurate, however, the length is clearly not extremely precise.
            const double htcScaleFactor = 1.0 / 1000.0 * 9.8;

            // Store the timestamp and vector for the next call in case it is too quick
            _lastSampleTicks = Environment.TickCount;
            _lastVector = ret.Scale(htcScaleFactor);

            return ret.Scale(htcScaleFactor);
        }

With this change in place my code now works perfectly. Even though the GSensor values returned by GetGVector are sometimes cached, this is not apparent at all in my application, and the freezing sensor results that I experienced before have gone.

Adam.
www.adamdawes.com
www.icangames.com

New Post: Proximity sensor into the API?

jinjav — Thu, 17 Dec 2009 14:12:29 GMT

I am looking for the same feature as well. The proximity should be added. Is it going to happen?

New Post: Help with Toshiba TG01 G-Sensor

weston — Tue, 03 Nov 2009 21:44:53 GMT

Try this post, has an api pdf attached.

http://forum.xda-developers.com/showthread.php?t=562976#2