# DEXI Flight Issues **URL:** \ **Category:** Secondary Vehicles (Sphero, Tello)\ **Created:** [October 25, 2024, 6:37pm UTC](https://forum.theavr.org/t/dexi-flight-issues/972 "2024-10-25T18:37:35Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![GioOC8](https://avatars.discourse-cdn.com/v4/letter/g/e68b1a/32.png) [@GioOC8](https://forum.theavr.org/u/GioOC8)\ **Post date:** [October 25, 2024, 6:37pm UTC](https://forum.theavr.org/t/dexi-flight-issues/972/1 "2024-10-25T18:37:36Z")
When flying our DEXI drone, we’ve encountered multiple situations where the DEXI begins to drift and ignore commands. Then, it flies into a wall, tilting and producing full throttle. In our most recent flight test, one or more of the cells in the battery burned up (pictured left). When trying with a different but similar battery (pictured right) we have not encountered this issue. ![IMG_20241025_133618](https://canada1.discourse-cdn.com/flex007/uploads/avr/original/1X/70b3caa5327de4b4885587a48cf6554d7b34955b.jpeg) ---
**Author:** ![GioOC8](https://avatars.discourse-cdn.com/v4/letter/g/e68b1a/32.png) [@GioOC8](https://forum.theavr.org/u/GioOC8)\ **Post date:** [October 25, 2024, 6:38pm UTC](https://forum.theavr.org/t/dexi-flight-issues/972/2 "2024-10-25T18:38:19Z")
The picture doesn’t show it very clearly, but near the bottom left and bottom right of the battery you can see that the battery is burnt. ---
**Author:** ![droneblocks](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.theavr.org/droneblocks/32/159_2.png) [@droneblocks](https://forum.theavr.org/u/droneblocks)\ **Post date:** [October 26, 2024, 6:13pm UTC](https://forum.theavr.org/t/dexi-flight-issues/972/3 "2024-10-26T18:13:36Z")
Can you use your cell checker and share the output of the cell voltages? You are welcome to use a lipo battery, but you won’t get as much flight time. We have specifically tuned DEXI to run for 15 minutes on the lithium ion. If DEXI is not responding to your transmitter inputs then something else is at play. I’m assuming there’s an issue with the receiver. If you could remove the SD card (the all black one) and grab the PX4 logs we could do an analysis. There is a log folder on that card you could zip up and share with us. ---
**Author:** ![GioOC8](https://avatars.discourse-cdn.com/v4/letter/g/e68b1a/32.png) [@GioOC8](https://forum.theavr.org/u/GioOC8)\ **Post date:** [October 28, 2024, 7:48pm UTC](https://forum.theavr.org/t/dexi-flight-issues/972/4 "2024-10-28T19:48:45Z")
We ran another test flight and it looks like the controller disconnected mid-flight. The controller displayed no connection and the drone continued flying in the direction it was already flying in for approximately 8 seconds, then landed on its own. ![IMG_20241028_144815](https://canada1.discourse-cdn.com/flex007/uploads/avr/original/1X/2a9a66ccedffe7c3d0ddc6b7c38bc6812279fb6f.jpeg) ---
**Author:** ![droneblocks](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.theavr.org/droneblocks/32/159_2.png) [@droneblocks](https://forum.theavr.org/u/droneblocks)\ **Post date:** [October 28, 2024, 9:54pm UTC](https://forum.theavr.org/t/dexi-flight-issues/972/5 "2024-10-28T21:54:29Z")
Any chance you can get us a flight log? I believe this could help us more quickly get to the bottom of the issue. Also, what flight mode do you have engaged? ---
**Author:** ![GioOC8](https://avatars.discourse-cdn.com/v4/letter/g/e68b1a/32.png) [@GioOC8](https://forum.theavr.org/u/GioOC8)\ **Post date:** [October 29, 2024, 8:16pm UTC](https://forum.theavr.org/t/dexi-flight-issues/972/6 "2024-10-29T20:16:32Z")
This behavior was mostly exhibited in the stabilized flight mode (white LED). I submitted the flight logs to [support@droneblocks.io](mailto:support@droneblocks.io) under DEXI Flight Logs - 1350A ---
**Author:** ![JNeaves](https://avatars.discourse-cdn.com/v4/letter/j/4491bb/32.png) [@JNeaves](https://forum.theavr.org/u/JNeaves)\ **Post date:** [October 30, 2024, 12:17am UTC](https://forum.theavr.org/t/dexi-flight-issues/972/7 "2024-10-30T00:17:04Z")
Here is a video of what its doing. It seems to happen in all modes except stabalized. [![](https://canada1.discourse-cdn.com/flex007/uploads/avr/original/1X/13178f5ea6fed68856ccd2565a9db9984aee10e8.jpeg "October 29, 2024") ](https://www.youtube.com/watch?v=loVXtFzp1BA) ---
**Author:** ![droneblocks](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.theavr.org/droneblocks/32/159_2.png) [@droneblocks](https://forum.theavr.org/u/droneblocks)\ **Post date:** [October 30, 2024, 11:07pm UTC](https://forum.theavr.org/t/dexi-flight-issues/972/8 "2024-10-30T23:07:59Z")
Thanks for the video. Any idea if this was a more recent flight or an older one? I ask because I’m looking through about 50 different log files and trying to find the one that matches up with the video above. I’m also trying to locate the one where it goes into the wall with full throttle. Here is the successful position flight mode (a quick 7s flight): [https://review.px4.io/plot\_app?log=52a9a831-f71f-445c-9186-2ee9220bbabc](https://review.px4.io/plot_app?log=52a9a831-f71f-445c-9186-2ee9220bbabc) and here is one I discovered where manual control was lost but it doesn’t look like PX4 ever let DEXI takeoff. It quickly switched to land mode and disarmed: [https://review.px4.io/plot\_app?log=690063e6-2e3b-44bc-8123-b275e74e4a8f](https://review.px4.io/plot_app?log=690063e6-2e3b-44bc-8123-b275e74e4a8f) Will report back when we learn more. ---
**Author:** ![droneblocks](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.theavr.org/droneblocks/32/159_2.png) [@droneblocks](https://forum.theavr.org/u/droneblocks)\ **Post date:** [October 30, 2024, 11:14pm UTC](https://forum.theavr.org/t/dexi-flight-issues/972/9 "2024-10-30T23:14:16Z")
I forgot to mention two things: 1. I see in several of the flights that there are critical battery levels. See this log: [https://review.px4.io/plot\_app?log=24b77f3c-e18d-4f27-955b-8e12575b9d12](https://review.px4.io/plot_app?log=24b77f3c-e18d-4f27-955b-8e12575b9d12) ![image](https://canada1.discourse-cdn.com/flex007/uploads/avr/original/1X/a1a95474e659080ad59a1540bdaa89007705549d.png) Please make sure to keep an eye on your battery levels before, during, and after flight. 1. I’m not sure if your lab is where all the test flights are happening, but there are a lot of metal objects (tables, chairs, filing cabinet) that can lead to magentic interference. If you have a more open area to test that would be ideal. ---
**Author:** ![JNeaves](https://avatars.discourse-cdn.com/v4/letter/j/4491bb/32.png) [@JNeaves](https://forum.theavr.org/u/JNeaves)\ **Post date:** [October 30, 2024, 11:58pm UTC](https://forum.theavr.org/t/dexi-flight-issues/972/10 "2024-10-30T23:58:14Z")
That flight was last night. It wouldnt be in the log that was sent. They flew it again today in the hallway and it did a little better. It has occured in both the lab and in the hall. Ill have them keep a better eye on battery levels. ---
**Author:** ![droneblocks](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.theavr.org/droneblocks/32/159_2.png) [@droneblocks](https://forum.theavr.org/u/droneblocks)\ **Post date:** [October 31, 2024, 12:48am UTC](https://forum.theavr.org/t/dexi-flight-issues/972/11 "2024-10-31T00:48:32Z")
Ah got it. One thing I’m seeing in the following flight log: [https://review.px4.io/plot\_app?log=c699a187-2abc-456f-9ec8-5f4352ef04b6](https://review.px4.io/plot_app?log=c699a187-2abc-456f-9ec8-5f4352ef04b6) If you look at the norm of the magnetic field it’s pretty inconsistent: ![image](https://canada1.discourse-cdn.com/flex007/uploads/avr/original/1X/d6afc3bdd4cde1e91881f60a3119f356d5fc5aef.png) You want something more like this with less variance: ![image](https://canada1.discourse-cdn.com/flex007/uploads/avr/original/1X/1a93bab0622acacb2f94bc1b544d1acc9f7fea16.jpeg) From the PX4 docs: > If the norm is uncorrelated but not constant, most likely it is not properly calibrated. However it could also be due to external disturbances (for example when flying close to metal constructs). I would recommend doing another compass calibration away from metal objects. > **[Compass Calibration | PX4 Guide (main)](https://docs.px4.io/main/en/config/compass.html)** > > PX4 User and Developer Guide ---
**Author:** ![JNeaves](https://avatars.discourse-cdn.com/v4/letter/j/4491bb/32.png) [@JNeaves](https://forum.theavr.org/u/JNeaves)\ **Post date:** [October 31, 2024, 1:23am UTC](https://forum.theavr.org/t/dexi-flight-issues/972/12 "2024-10-31T01:23:34Z")
I will have them do this in the morning and see if this gekps. Thanks for taking a look at the logs.