APM 2.6 USB connection problem

Posted by Ilya Semenov on November 12, 2013 at 8:55am

Hi everyone !
I had a big prolem with APM 2.6, and I do not know how to solve it, so it is hope for your help :)


Three weeks ago I bought a new autopilot APM 2.6. During this time, several times I have installed it ArduPlane and ArduCopter software. And after a regular re-flash ArduPlane I found a problem with USB-connection.


Flashing is normal, but when I try to connect via COM-port, it is either not connected or the connection is interrupted during transmission parameter PITCH2SRV_I (with "_I" I could be wrong), or during transmission parameter RC2_TRIM. Sometimes the connection is established, but in the "status" is not displayed any information about the state of the autopilot, all the parameters are zero. Also APM 2.6 do not activated servos when it powered via USB or ESC.

It did not help to use different versions of firmware, Mission Planner and different computers. Even tried to connect the APM through different USB-cables - and also did not help. : (

I tried to find malfunction in hardware, using the tests in the terminal. Everything worked fine, except the IMU-sensors: the terminal is not able to connect to them. After checking the voltage on these sensors (gyroscope and altimeter), I found that
voltage does not exceed 0.4 V instead of 3.3 V (autopilot powered via USB).

Does anyone faced with such a problem? How to solve it?

You need to be a member of diydrones to add comments!

Join diydrones

Email me when people reply –
Follow

Replies

  • Benjamin Harvey February 19, 2014 at 7:39am

    Hi in case anyone is interested the regulator is a TPS9133, 

    http://www.ti.com/lit/ds/symlink/tps79133-ep.pdf (link to datasheet)

    http://www.ti.com/lit/ds/symlink/tps79133-ep.pdf
  • David wilks December 28, 2013 at 9:26am

    I have exactly the same on my 2.6

    Worked fine until today when MP updated to 1.2.91.2 and flashed to 3.1.

    Tried to go back but now joy

    David

  • Alexey Kozin November 12, 2013 at 10:02am

    easy solution

    http://forum.rcdesign.ru/blogs/99365/blog17682.html

    DSC_0358.jpg

    Китайский недоклон Ardupilot mega 2.5.? HKpilot и проблема трехвольтового стабилизатора - Дневники…
    Китайский недоклон Ardupilot mega 2.5.? HKpilot и проблема трехвольтового стабилизатора alexeykozin
  • Admin
    Thomas J Coyle III November 12, 2013 at 9:03am

    @Илья Семёнов,

    The voltage of 0.4vdc that you are reading on the 3.3vdc line indicates that the 3.3vdc regulator on the APM pwd is defective.

    Is your APM2.6 a 3DR product or a clone?

    There have been discussions on the Arducopter forum of members finding defective 3.3vdc regulators on their APM pwbs. Changing the SPI bus frequency to 8MHz has caused some APMs to have trouble communicating with the IMU sensors.

    Regards,

    TCIII ArduRover2 Developer

This reply was deleted.