Hi guys. My APM is not working and I wanted to ask you guys about it while waiting to hear back from 3DR support. I have an APM 2.0 with built-in GPS. It has flown 4 or 5 times with each each flight having greater success (ArduPlane firmware). The previous couple flights were almost perfect. However, last weekend I could not get a GPS lock. After waiting several minutes I tried pressing the reset button. Then after waiting about 20 minutes, I unplugged the UBEC power to reboot the APM. (UBEC with a separate battery is powering the APM and the BEC/ESC is powering the servos.) Upon turning the APM back on, nothing happened. No lights, nothing. I checked the connections and the UBEC and it was correct/working. At home I plugged the APM into the computer via USB, and the lights did come on (and Windows' Device Manager saw it), but failed to connect in Mission Planner. There was an error message, "No Heartbeat Packets Received".

I've set this unit up by the book and been very careful to have it correctly powered. Nothing unusual that I know of happened to cause this.

Is there anything I can check or do to fix this?


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Check again that you have the right port selected in MP. Try open the port in a terminal emulator program, such ass HyperTerminal or TeraTerm, suing the correct speed 115200 bits/s. Do you see data?

Did you change any of the solder jumpers on the APM board?

And finally - does flashing new firmware work in AP? You should select the port but not connect before you do this.



Thanks Søren, I'll give this a try tonight. To answer your second question, no nothing was changed. It was working (except for the GPS locking in), I unplugged it, plugged it back in, and it was dead.


I did as you suggested, connected to APM with HyperTerminal. No data, but I'm sure I was connected because every time I typed a letter, an amber LED on the APM would light up. I double checked that the correct com port and speed were selected. 

I tried flashing new firmware, but got the error, "Can't detect your APM version...".

It's frustrating because when I try to flash the firmware or connect, LED lights on the APM show activity but no success. Any ideas? 

For the process of elimination, did you try seeing if your APM connected through CLI? As it isn't connecting through mission planner, I would expect that it doesn't connect, but worth seeing anyways.

If for some reason it does you can use the commands to erase or reset to factory or other just test.

I am having the exact same problem with my APM 2.0 board.  A handful of successful flights.  Nothing out of the ordinary happened between the time the board last worked and the time that it stopped connecting to MP.  When connected via USB, LED indicators working as expected, board is detected and correctly shown in the Device Manager but I get "No Heartbeat Packets Received" message when trying to connect with MP.  I receive this message when trying to connect via USB or X-bee.  Attempted to reload firmware and get - "Cant detect your APM version" error.  Also tried to connect via CLI with no luck - I get "Opened com port" but no initialization message.  Rx LED blinks when sending commands but no response back.

Any suggestions to help get flying again would be appreciated.


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