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
RT @a1k0n: @SmallpixelCar @diyrobocars It's just something that's easy to track with chroma keying. I ended up using different colors on th…
5 hours ago
DIY Robocars via Twitter
5 hours ago
DIY Robocars via Twitter
RT @TinkerGen_: "The Tinkergen MARK ($199) is my new favorite starter robocar. It’s got everything — computer vision, deep learning, sensor…
Nov 23
DIY Robocars via Twitter
Nov 23
DIY Robocars via Twitter
RT @roboton_io: Join our FREE Sumo Competition 🤖🏆 👉 https://roboton.io/ranking/vsc2020 #sumo #robot #edtech #competition #games4ed https://t.co/WOx…
Nov 16
DIY Drones via Twitter
First impressions of Tinkergen MARK robocar https://ift.tt/36IeZHc
Nov 16
DIY Robocars via Twitter
Our review of the @TinkerGen_ MARK robocar, which is the best on the market right now https://diyrobocars.com/2020/11/15/first-impressions-of-tinkergen-mark-robocar/ https://t.co/ENIlU5SfZ2
Nov 15
DIY Robocars via Twitter
RT @Ingmar_Stapel: I have now explained the OpenBot project in great detail on my blog with 12 articles step by step. I hope you enjoy read…
Nov 15
DIY Robocars via Twitter
RT @DAVGtech: This is a must attend. Click the link, follow link to read the story, sign up. #chaos2020 #digitalconnection #digitalworld ht…
Nov 15
DIY Robocars via Twitter
RT @a1k0n: Got a new chassis for outdoor races (hobbyking Quantum Vandal) but I totally didn't expect that it might cause problems for my g…
Nov 11
DIY Drones via Twitter
First impressions of the Intel OpenBot https://ift.tt/36qkVV4
Nov 10
DIY Robocars via Twitter
Nov 9
DIY Robocars via Twitter
Excellent use of cardboard instead of 3D printing! https://twitter.com/Ingmar_Stapel/status/1324960595318333441
Nov 7
DIY Robocars via Twitter
RT @chr1sa: We've got a record 50 teams competing in this month's @DIYRobocars @donkey_car virtual AI car race. Starting today at 10:00am…
Nov 7
DIY Robocars via Twitter
Nov 6
DIY Robocars via Twitter
RT @a1k0n: Car's view, using a fisheye camera. The ceiling light tracking algorithm gave me some ideas to improve ConeSLAM, and having grou…
Nov 5
More…