mini APM 3.1 only green LED turn on

Hi,
I have a mini APM v3.1 board. Yesterday, I found that it cannot recognize external compass suddenly, therefore I decided to downgrade the firmware by using mission planner.
But after then, I cannot link my mini APM in mission planner. it always said "time out" when click "CONNECT" button. And in terminal, there was only "Opened com port", no other information. I check in my window device manage, I have "Arduino Mega 2560" in com3, and using 115200, as same as the setting in mission planner.
I also found that there is only green LED(PWR) turn on when power on my APM, no ABC LED.
So I decided to flash Atmega32U2 by following this link:
http://copter.ardupilot.com/wiki/com...2x-atmega32u2/
This process is ok, I finish it. But still cannot link in mission planner.
Can you give me some suggestions to debug it?
I have no idea what I should do in next step.
I'm not sure if my board die or not, but I hope it is only due to bad firmware or bootloader.
Thanks a lot.

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Replies

  • I found the ISP pin on miniAPM 3.1 from google. After soldering these pins to Arduino USBasp, I finally flashed 2560 bootloader. And then, my miniAPM is back!!! It is work perfectly.
    :D

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