CODEWITHSUNDEEP
androidaccelerometerwear-osgyroscopemoto-360
Foreverniu
Foreverniu

Reputation: 459

Android Wear: Gyroscope data unchanged when logging both lin_accl and gyroscope

I am trying to read both gyroscope and linear_acclerometer data in the highest sample rate on my Moto 360 . I will press a button on the handheld, which will register sensors on the watch and start loggging all the sensor data, and when I press another button, the watch will unregister these sensors and stop logging.

However, the sensor value will become a constant value sometimes. I found if I restart the watch, the sensor will start working and generate meaningful sensor value again.

Does anyone has encounter the similar problem or have some ideas on why this may happen ? 

private void startSensorListeners() {
        Log.d(TAG, "startSensorListeners");
        isCollecting = true;
        //Register the motion Sensor Listener
        mSensorManager.registerListener(this, mSensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE), SENSOR_DELAY);
        mSensorManager.registerListener(this, mSensorManager.getDefaultSensor(Sensor.TYPE_LINEAR_ACCELERATION), SENSOR_DELAY);
}

public  void stopSensorListeners() {
         isCollecting = false;
          mSensorManager.unregisterListener(this);
    }

 public final void onSensorChanged(SensorEvent event) {
       if(!isCollecting){
           mSensorManager.unregisterListener(this, event.sensor);
           return ;
        }
    // Save sensordata into local files, I also output the values[] in event on the logcat to monitor the sensor values in the realtime.
    saveData(event);
    }

Thanks

Upvotes: 0

Views: 676

Answers (1)

Gordak
Gordak

Reputation: 2070

I don't have an actual answer for this. I'm just sharing my problem because I feel like they are very similar. The problem occurs on a Moto 360 and was not tested on another device.

I use the Magnetic sensor. 

mMagneticSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);

I register my Fragment as a listener to new values.

mSensorManager.registerListener(this, mMagneticSensor, SensorManager.SENSOR_DELAY_NORMAL);

I was developing an application. At the beginning, they were changing as expected but, after ~an hour, the values from the sensor just froze, remaining exactly the same no matter what.

I suspect two things: battery level and data rate renewal.

Maybe the battery dropped below some acceptable level (was around 25% when it stopped working)... it would be weird but it would not a big surprise.

Secondly, I remember having changed SensorManager.SENSOR_DELAY_NORMAL) to SensorManager.SENSOR_DELAY_UI) at some point, not long before the values froze. Perhaps it's a coincidence. The SensorManager.SENSOR_DELAY_UI is a faster data rate renewal than SensorManager.SENSOR_DELAY_NORMAL and as I was modifying a bitmap each time I got a new value. Maybe a buffer was full and wasn't emptied...maybe

Anyway, if I got some news on this subject I will update this post.

Upvotes: 1

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