Battery percentage and altitude percentage is always 0

[valizada]

Hello,

Firstly thanks for the great library. I am having some problems with functions such as getBatteryPercentage() and getAltitude(). They always return 0(even though battery is fully charged).

Do you have any idea what could be a cause to this?

Thanks,
Fiz.

[puku0x]

Hi

I had the same problem when run the sample program on Ubuntu (or OS X?).
What about switching navdata_demo=TRUE ?

// ./src/ardrone/navdata.cpp
// AR.Drone 2.0
if (version.major == ARDRONE_VERSION_2) {
    // Disable BOOTSTRAP mode
    if (mutexCommand) pthread_mutex_lock(mutexCommand);
    sockCommand.sendf("AT*CONFIG_IDS=%d,\"%s\",\"%s\",\"%s\"\r", ++seq, ARDRONE_SESSION_ID, ARDRONE_PROFILE_ID, ARDRONE_APPLOCATION_ID);
    sockCommand.sendf("AT*CONFIG=%d,\"general:navdata_demo\",\"TRUE\"\r", ++seq); // HERE !!
    //sockCommand.sendf("AT*CONFIG=%d,\"general:navdata_demo\",\"FALSE\"\r", ++seq); // NOT USE
    if (mutexCommand) pthread_mutex_unlock(mutexCommand);
    msleep(100);

    // Seed ACK
    sockCommand.sendf("AT*CTRL=%d,0\r", ++seq);
}

If getBatteryPercentage() and getAltitude() work, it seems there is some bug in ARDrone::getNavdata().

Another solution is to update the firmware of your drone to the latest version.

Thank you,
puku0x

[valizada]

Hi,

Thanks for the reply. I am running it on OS X. I have read about previous issues that had been opened, and have already changed navdata_demo to true, but it seems like it doesn't help. In addition, the latest version of firmware is installed on the drone. Probably there is another bug in getNavData function.

Thanks,
Fiz

[puku0x]

Hi,

Thank you for your report.
I will check it tomorrow.

Regards,
pukuox

[puku0x]

Hi,

Sorry for my late reply.
Unfortunately, I could not reproduce the issue.

AR.Drone Ver. 2.4.8
OS X 10.11 El Capitan
OpenCV 3.0.0.1 (via MacPorts)
CV Drone 15dd043

[valizada]

Hi there,

Thanks for looking into this.

I am not sure if this is what causes the issue, but I have OpenCV 2.4.12 (via brew).
I will upgrade, check again and report back.

Thanks,
Fiz.

[valizada]

It worked after upgrading libraries. Thank you

[Deleted user]

Please tell me how to upgrade the libraries on windows, i am having the same problem.