Play with Phidget USB 3-axis accelerometer under Sensor Framework

Submitted by wing, updated on 20 Oct 2009 - 6 comments
Sensor Framework

Thanks to pulgin system of sensor framework, various devices could be easliy supported. I'd like to cite Phidget USB 3-axis accelerometer as an example. Here is the offical link of the product:

http://www.phidgets.com/products.php?product_id=1059

Steps of installaztion:

1. Plug the accelerometer into your device

2. Launch sensor framework by:

sensord -c /etc/sensorframework/module-phidget.conf -d /usr/lib/sensorframework/modules/

You are also allowed to start framework first and then plug into the device, it's ok, what's a beauty of hot-plug :)

Here is a simple testing application uses acceleromter. It simply receives data and prints on screen

/*accel-test.c*/
#include <libsensor/sfcustomer-object.h>
#include <libsensor/accel-object.h>

static rec_count;

static void receive_cb (SFAccel* self, SFAccelVector* vec, gpointer userdata) {
    AccelVector* v;
    v = ACCEL_VECTOR (vec);
    sf_log_debug("(fx,fy,fz,x,y,z,timestamp) = (%f,%f,%f,%f,%f,%f,%d)\n",
            v->x, v->y, v->z, vec->raw_x, vec->raw_y, vec->raw_z, vec->timestamp);
}

#define DEFAULT_PERIOD (600)
gint main(gint argc, gchar* argv[]) {
    SFCustomer* ctm;
    SFAccel* acc;
    GError* err = NULL;
    SFSensorID id;
    gint idcount = 0;
    gulong hander_id;
    guint period = 0;

    if ( argc < 2 ) {
        g_print ("Usage:\n"
                 "./accel-receive-test period_in_second\n"
                 "Example: ./accel-receive-test 600\n");
        g_print ("Run with default period=600\n");
    } else
        period = atoi (argv[1]);

    if ( period == 0 )
        period = DEFAULT_PERIOD;

    ctm = sf_customer_new (&err);
    if ( !ctm ) {
        g_print ("%s, Cannot create SFCustomer\n", err->message);
        exit (-1);
    }

    acc = sf_accel_new (ctm, -1, &err);
    if ( !acc ) {
        g_print ("%s, Cannot create SFAccel\n", err->message);
        exit (-1);
    }

    hander_id = sf_sensor_connect_receive_func (SF_SENSOR (acc), G_CALLBACK (receive_cb), NULL);
    sf_sensor_set_active (SF_SENSOR(acc), TRUE);
    sleep (period);
    sf_sensor_set_active (SF_SENSOR(acc), FALSE);
    sf_accel_destroy (acc);
    sf_destroy (ctm);

    return 0;
}

Before compiling, make sure the development pakcage is rightly installed. If not, follow this:

yum install sensorframework-devel

then generate execution through:
gcc `pkg-config --libs --cflags sensorframework` accel-test.c -o accel-test

For API reference, find at here:

http://moblin.org/documentation/api-sensor-framework-accelerometer-als-t...

Comments (6 total)

MID

Submitted by kylin_gou on 9 February 2010 - 8:00pm.

I compile my sensorframework.,but sensord daemon not start,how to use new sensord daemon?thanks

see "build and run" in

Submitted by wing on 11 February 2010 - 8:13am.

see "build and run" in documentations

Noe that you need to install

Submitted by Henry Bruce on 15 December 2009 - 11:12pm.

Noe that you need to install Phidget software before running configure, otherwise the Phidget module will not be built.

You also need to create your own module-phidget.conf as it is not in the source.

Thanks Henry!

Submitted by wing on 16 December 2009 - 12:08am.

Thanks Henry! module-phidget.conf has been included in source now.
I will try to write a script to intall phidget library also.
Welcome comments if you feel inconvenient when using framework

I tried to install

Submitted by swingingdog on 15 December 2009 - 8:03pm.

I tried to install sensorframework-devel, but it told me that no such thing exists.
Why is that?

[root@box]# yum install sensorframework-devel
Loaded plugins: presto, refresh-packagekit
Setting up Install Process
No package sensorframework-devel available.
Nothing to do

Hi, what destribution you

Submitted by wing on 15 December 2009 - 10:11pm.

Hi, what destribution you use?
RPM of sensorframework only available in Moblin destribution. If you are using Fedora or ubuntu, you have to download the source and build it by youself.

If you are using moblin, pls check if your yum repo points to right place. or you could paste your yum repo here and i will check whether the repo is correct