Hi everybody.
Several months building a large quad with pixhawk px4 fmuv2 installed, and long range video transmission, with a gimbal, and powered by a large 22volts 12000mah battery. The whole weight is 4kgs, and the quad flew for continuous 35 minutes. I was very happy about the long flight time and its good stability. Until last week, and just the second flight when I was trying video recording above a lake, and after 5 minutes flight, the quad began to wobble crazily, and I couldn't control it before it was falling into the lake and sunk. After five hours, I was able to extract it from 3 meters under water ,using a water bike and following last GPS position in QgroundControl.
After reviewing the log, and connections, I concluded that the cause might be a disconnected wire from the power board which touched the board and caused it to burn, although the ESCs were directly connected to the battery and the pixhawk directly to the power module.
I disassembled all the parts,clean, brush,dry.. and I was happy I could recover all of them except for the pixhawk.
After first connect to Pc via usb port, it was powered normally, all leds and main light were functionning OK. But I couldn't power it from battery. Another thing was that I could install the px4 firmware on it but not the arducopter and the main led light never lit. And after a stupid try of installing px4io bootloader from sd card, the pixhawk was no longer seen from MP or Qgroundcontrol, I tried the python loader , it gave a message "waiting for the bootloader" although I tried to hold switch while powering the pixhawk.

Note: the leds status when connected to pc in normal mode:

IO POWER AND FMU POWER:ON
IO B/E: ON
IO Act: blinking

When in boot mode
IO POWER AND FMU POWER:ON
IO B/E:blinking
IO Act: OFF

Images before a20200212_215731.jpgnd after crash and log file are attached
Any help to recover my pixhawk back and also resolving powering problem from battery will be really appreciated.
Thx in advance

20200317_154851.jpg

20200317_175513.jpg

CrashLog.rar

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –

Activity

DIY Robocars via Twitter
Sep 9
DIY Robocars via Twitter
RT @chr1sa: We've got another virtual @DIYRobocars race tomorrow at 9:00am PT. Two dozen autonomous cars will compete, four at a time. Ther…
Sep 4
DIY Robocars via Twitter
Sep 1
DIY Robocars via Twitter
Aug 31
DIY Robocars via Twitter
Aug 31
DIY Robocars via Twitter
RT @ExplorerRobocar: Sometimes, I am really a big kid!! Having fun with my virtual RC car on the @diyrobocars track 😜😉, by using the « AR R…
Aug 24
DIY Robocars via Twitter
RT @grepLeigh: @donkey_car @unity3d @TensorFlow ~1050 episodes into training, my agent learned to erratically drive in the left lane. 🤖😆 ht…
Aug 24
DIY Robocars via Twitter
RT @EclipseCyclone: Sweet! http://Robotec.ai high performance #ROS 2 @unity3d #CycloneDDS bridge for @AutowareFdn @SVLSimulator now…
Aug 24
DIY Robocars via Twitter
RT @a1k0n: My car had a lot of trouble getting around the track at the last @diyrobocars event -- only one actual finished lap during the r…
Aug 24
DIY Robocars via Twitter
RT @SmallpixelCar: This is the run time map https://t.co/VzykOkUt2G
Aug 24
DIY Robocars via Twitter
RT @SmallpixelCar: Made a lot progress on Warm Spring Raceways track. Almost finished one lap. https://t.co/nUVpufZQyP
Aug 24
DIY Robocars via Twitter
RT @AntonioRobotics: Super fun time seeing these autonomous cars race at @circuitlaunch for the @diyrobocars quarterly meet up! The demolit…
Aug 15
DIY Robocars via Twitter
RT @a1k0n: I thought my dumb localization code was still working at the new @circuitlaunch track, but it was just *barely* working. I shoul…
Aug 14
DIY Robocars via Twitter
RT @DAVGtech: Recording of entire in person @diyrobocars race today @circuitlaunch. Fast forward a couple hours to go straight to the racin…
Aug 14
DIY Robocars via Twitter
RT @SmallpixelCar: This is the run time map. Very noisy Lidar signal https://t.co/bAbeVUMi10
Aug 14
DIY Robocars via Twitter
RT @SmallpixelCar: Today’s race with @a1k0n at @diyrobocars We both decided jumping over the wall was the way to break the 11s lap time. Th…
Aug 14
More…