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Long startup time and IMU error help

Discussion in 'Pro/Adv Discussion' started by mikecorn1, Feb 2, 2016.

  1. mikecorn1

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    I've only flown my P3A about 4 times but I have noticed that I get an IMU error please calibrate (or something like that). It also will take close to a minute before it will say it ok to fly. I've had no issues with it staying in one spot hovering. Today I was hovering about 200 feet up and it was as steady as if it was sitting on a table. Winds were around 7mph.
    I looked up the IMU thing online and it directed me to do an IMU calibration. Found a nice video on YouTube. The guy said to get the phantom as cold as you can get it because once you turn it on it will start to warm up something and it will not sol as well for calibrating purposes. Also have my DJI app already opened to the IMU calibration page.
    I live in south Texas and it doesn't get that cold even now it's 59F outside. The video said that this calibration will cure the startup time. I'm a going in the right direction by doing this.
    Thanks.


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    #1 mikecorn1, Feb 2, 2016
    Last edited: Feb 3, 2016
  2. msinger

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    Yep -- everyone should do a cold IMU calibration.

     
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  3. mikecorn1

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    That's the video I watched.
    So how cold does it need to be for an effective calibration?


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  4. dand.

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    Ok, just one simple question, can I do IMU calibration outside? Its 39F outside right now.


    Just keep flying.
     
  5. ObiDon

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    65-70 should work. Avoid cooling it off to fast as you could get condensation on it. I live in Texas and putting it the garage for 20min works.
     
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  6. msinger

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    It should be colder than any temperature you plan to fly in.
     
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  7. mikecorn1

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    Thanks


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  8. nix240z

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    I did my imu when i had it outside for 30 min. In 25-27 deg.
    My p3p starts right up with no delay. Make sure you don't leave battery in when outside and imu calibration needs to be done on a level surface. I use a level on a large tile and shim it to get it as level as possible
     
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  9. mikecorn1

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    I just did it. Took about 7 minutes. I turned everything off and back on. The phantom went from almost 1 minute to be ready for flight to less then 10 seconds it seemed like. Also, no more IMU error. Really , really quick. Like my brother's phantom.
    Thanks for the help again.


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  10. phantom1972

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    What is the big issue with the refrigerator? I'm in FL, and even the evenings are above 72 deg. Is the refrigerator issue humidity? The refrigerator compartment is probably in the 40's, and could hold moisture. Anything below freezing won't have any humidity, but the air in the aircraft might, plus going from 72 to near 0 deg instantly is rude on contraction rates.

    I don't see why the regular refrigerator compartment is so bad. Why? Thanks!
     
  11. msinger

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    I'm not sure. People have done it and I've never heard of it causing any damage.
     
  12. Tony Cowan

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    Old thread. Fridge is just suggestion. When I did it. I simply placed it in front of air conditioner a few mins. Now all is in seconds. No need to do another. I'm also in Florida


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  13. alokbhargava

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    I always did it at room temperature in the morning which is about 55 F and never faced any issue.