Hi Ardupilot community users
I encountered a problem that I couldn’t understand. I assembled a Quadcopter by myself. The equipment list is as follows:
FC: PixHawk 6C mini
ESC: Hobbywing Xrotor 4 in 1 65A
GPS: Holybro M10 GPS
Receiver: RadioMaster ER8
Remote control: RadioMaster TX16S MK.2
The problem is as follows:
The battery power supply was normal during my ground preparation, but because I just wanted to confirm whether the flight mode was normal, the battery voltage and current calculation was not fully entered, and only the battery capacity and voltage were entered. I had test flown 3 to 4 times before this test flight (the tests were all on different days), but during this test, the battery voltage was confirmed to be 16V before takeoff, and the status before takeoff was normal. When I switched from stable mode to PosHold, the aircraft suddenly lost power and fell to the ground from a height of about 1.5M. This sudden power outage after startup happened once when I first got the battery, and it did not happen again in subsequent tests. Is there a problem with the software? Or is there something wrong with the battery itself?
The attachment is the flight record and parameter file.
Changing to POSHOLD is purely conincental. All the flight modes are extremely well tested. Use Loiter instead of POSHOLD anyway.
The problem is ALL power is lost - logging and everything just stops mid-flight. Look for a problem with soldering or connections, possibly a faulty battery connector.
Also the voltage monitoring is wrong and it shows exactly 16 volts the entire time - that’s virtually impossible.
Check if you have the analog or digital power brick and check your settings against the Holybro docs
Thank you for your help. I will check and reconfirm the parameters about the battery.
Regarding the difference between PosHold and Loiter modes, I am not very clear about their differences, because I did not find much difference when reading the documents, so why is it better to use Loiter mode?
POSHOLD is just Stabilise (quite raw and manual) with GPS position when you release the sticks.
Loiter is like a guided mode with extra parameters for more control - the sticks move a “ghost” of the copter to where you want it to be, and the copter works out how to get there given the allowed accelerations and speed.