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Compass calibration for the HoverflyGPS (v.4.3 and above)

Calibrating the compass on your HoverflyGPS

Notes:

1.  You should start with your HoverflyPRO connected to your HoverflyGPS and your multirotor ready to fly, with the main battery plugged in and ready to arm.

2.  The LED on your HoverflyPRO should be blinking green (disarmed) and your HoverflyGPS should not be blinking purple.

3. The calibration should be performed outdoors and at least 10 feet away from buildings, cars, power lines, etc. - anything that could interfere with a magnetic reading. A grass field is best.

4. Your HoverflyPro and HoverFlyGPS should not be connected to your computer

To start the calibration:

1. Move your throttle to its maximum setting and your rudder to its farthest right setting

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Your HoverflyPRO will begin to beep and the LED will blink red.  This indicates the calibration has been started.

 

2. With the front of your HoverflyPRO facing north, slowly rotate your multirotor along the pitch axis end over end a few times (more than 360 degrees of rotation)

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3. With the front of your HoverflyPRO facing west, slowly rotate your multirotor along the roll axis end over end a few times (more than 360 degrees of rotation)2012-07-03_17-02-32_441__Small_.jpg

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4. To finish the calibration, move your throttle to its lowest setting.

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Your HoverflyPRO will beep again to indicate that the compass calibration is completed.

 

5. Verify your calibration!!!

It is critical to verify that your calibration was successful by looking for the checkbox as shown below.

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6. Check the quality of your calibration.

With the HoverflyGPS connected to the setup client, verify that each cardinal direction is indicated when the multirotor is facing that direction.  Confirm that when the multirotor faces north the compass indicates north.  Repeat this for south, east, and west.  The compass indicator indicates magnetic heading and should match a map compass closely.

 

If your compass is not indicating the correct direction, repeat the calibration, paying close attention to the instructions and making sure you are away from anything that could cause a magnetic disturbance.

Another common cause for an incorrect compass heading are ferrous materials in your multirotor.  This includes steel screws and other hardware - anything that sticks to a magnet.  Motor magnets will not cause a disturbance, but your multirotor should not include steel parts.

Sometimes, proximity to ESCs and other equipment can cause the compass to indicate a good heading while on the ground, but an incorrect heading while in the air.  To avoid this problem ensure the magnetometer (whether onboard or external) is at least 5 inches from your electronic speed controllers.

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4 Comments

  • 0
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    Hansen Tsang

    How do I verify the compass calibration when I need to be outside to get a GPS fix and I need to be indoor to hook up to the setup client on the computer?

    Thanks.

  • 0
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    Ben Halsted

    Hi Hansen -

    The easiest answer is a laptop, netbook, or other portable computer that can go outside with you. Failing that, we are usually able to get a GPS fix indoors with the craft near a large window, but this will depend largely on your geography.

    Thanks for flying with us!

  • 0
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    Jefferson Hauptmann

    Ben,

    i've just procced with the calibration. hoverfly setup client shows me thats ok, north facing also seems to be ok. But on flight, when i turn on position hold or rth, it wants to fly away no matter what. other weird thing is that the gps telemetry don't show any data on my DX8. i'm doing something wrong?

  • 0
    Avatar
    Ben Halsted

    Hello Jefferson,

    Check the alignment of the antenna and external magnetometer (if you are using one). The magnetometer in particular needs to be as square as possible with the HoverflyPRO+GPS. If you still have issues, please use the "Submit a Request" link to enter a work ticket for the engineers.

    Thank you for flying with us!

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