can't connect to MAVLink via USB - PANIC: AP_Baro::read unsuccessful for more than 500ms in AP_Baro::calibrate [1] - Discussions

Hi everyone, I am trying to figure out what is going on with my APM 2.5

I have just started to get my drone electrics online and flash upgraded the unit (using usb and my macbook air) everything went as expected and then I managed to connect to the unit through USB and got telemetry feed back along with being able to change the airframe settings. I got distraced and had to disconnect and come back and since then I haven't been able to connect to the unit. I have tried a windows computer too and reinstalling everything plus reflashing the unit with no luck.

I have managed to open the comms monitor unit in MP and found that the unit is starting up when i connect to it however, i am getting the following error:

Opened port!

Link usbmodemfa131 is connected.

Init ArduCopter V3.1.2 (ddd4d881)

Free RAM: 1599

FW Ver: 120

----------------------------------------

load_all took 1755us

0xfe 3 0x00 0x01 0x01 0xfd 0x01 No dataflash inserted 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0xc2 3COMPASS INIT ERROR

Press ENTER 3 times to start interactive setup

0xfe 3 0x01 0x01 0x01 0xfd 0x01 Calibrating barometer 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 _R

PANIC: AP_Baro::read unsuccessful for more than 500ms in AP_Baro::calibrate [1]

I am obviously assuming that this is something to do with the barometer on the board however, I don't see how this could have changed from turning on and off. The only light that i have on constant is the power green LED. The blue and red led's only come on briefly at start up and then stop.

Please help -

Thanks

Replies

Tamas King March 7, 2014 at 1:32am

seem to have solved the issue - I had a chat to 3DR and they pointed me in the direction of the 3.3v regulator. On measuring the output of it I had no voltage which would make sense. Unit was out of warranty so have had to order a new one. In the mean time i am getting a new IC and going to replace it so i have a backup unit.

Pain in the backside but least I am at the bottom of the issue.

Hope it helps.
- Jesse Phelps > Tamas King March 7, 2014 at 11:54am
  
  Thanks, that was my problem too. I'm going to try to order a new regulator chip and solder it on.
bblatter March 5, 2014 at 6:11pm

Connect via terminal mode and run the tests for the compass and ins. If those fail then measure the voltage of the two outermost pins of the i2c connector. You should get 3.3v. There are lots of posts explaining how to do this. Are you using a genuine 3dr apm?
Jesse Phelps March 5, 2014 at 1:39pm

Have you figured out a solution yet? I am having the same issue.

This reply was deleted.