It appears I have managed to kill my PX4, and I'm scratching my head as to why...
The relevant parts of my setup include the following:
- Two in-series 3S LiPo batteries connected to a 3DR Power Module
- Power module connected to a PDB
- Two ESCs (which have a 5V BEC built in) connected to the PDB, and in turn, connected to the PX4
This setup worked fine, with my batteries fully charged and connected to my PX4 for weeks of setup and calibration.
Now, I finally come to installing my RC Receiver (TGY IA6C). I plug it into the correct RC IN ports on the rail, connected via PPM to the receiver. The polarity is correct. Now when I go to power my board, everything is fine.
When I power the first motor/ESC, which is in turn supplying 5V to the rail, I hear a popping sound, smell the characteristic smell of burnt electronics, and all lights on my PX4 go dead bar FMC PWR light. The PX4 appears dead, and it appears to have died with the RC pins connected and when applying a second power source to the rail. Note, it was a regulated power source. The ESCs contain a 5V BEC.
I've attached a picture of the output when attempting to run maxproxy.py from a connected companion computer. I thought the PX4 supplied power to the RC-IN but not the rest of the rail? Hence the convenience of a built in BEC to the ESCs.
Does anyone have any idea what I did wrong?