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pixhawk won't arm

Posted by Pritam Ghanghas on September 30, 2014 at 1:55pm

Hi

I am building a new quadcopter but pixhawk fails to arm. Here is what I have done till now

1. Connected radio and esc to pixhawk.

2. connected a independent bec to output rails for power. Didn't connect pixhawk power module because I don't have the right connection with me.

3. calibrated radio in QGroundControl. All good.

4. tried to calibrate ESC by recommended all in one method. No response from pixhawk. I guess it never goes into ESC calibration mode. 

5 Gave up on all in one calibration, by passed pixhawk and connected servos directly to reciever's channel 3. Did calibration one by one using this method.

6 reconnection reciever and servos to pixhawk again.

No response to throttle. Tried disable switch nothing. blue led will keep flashing. If I do a long press of disable switch, its led goes into quick flashing.

Does any of it sound familiar. I am out of options.

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Replies

  • This reply was deleted.
    • Pritam Ghanghas October 7, 2014 at 11:20am

      Thanks Dan,

      But I got it to fly without GPS. Problem was I didn't know that we have to hold the throttle down and to right for about 3seconds to arm the quad.  Newbie problem. I haven't ordered a GPS unit yet. As far as I know Pixhawk has onboard compass. I even calibrated it.

      • Pritam Ghanghas > Pritam Ghanghas October 9, 2014 at 12:21pm

        Now I have another problem. My copter always drifts on yaw whenever I move pitch, pitch also changes but there is a measurable effect on yaw also.

        If I pitch forward there is a small movement on yaw towards left and if I pitch backward the yaw movement is towards right. I have been searching with little luck. What could be the problem, where do I look.

        • This reply was deleted.
          • Pritam Ghanghas October 10, 2014 at 12:43am

            This is the only hint that I have found till now.

            http://copter.ardupilot.com/wiki/troubleshooting-2/#The_quad_always...

            according to this, it will be alright after a few flights. Or may be I understood it wrong.

            • Pritam Ghanghas > Pritam Ghanghas October 10, 2014 at 3:21am

              This seems to be another helpful pointer haven't tried it yet.

              http://diydrones.com/forum/topics/ac3-1-rc5-yaw-issue

              • Pritam Ghanghas > Pritam Ghanghas October 10, 2014 at 11:23am

                Well my problem turned out to be another total noob problem. My RC Tx had channel 2 (pitch) and channel 4 (yaw) mixed. They were moving with each other. Nothing to do with pixhawk. Will test in the morning.

                • This reply was deleted.
                  • Pritam Ghanghas October 12, 2014 at 6:56am

                    Hi Dan,

                    Crash can damage the frame. It may throw off the center of gravity of the copter or worse introduce a lot of vibration.  I have had both problems and they can be very irritating. May be your issue is linked to these problems as you mentioned that problem started after crash.

                     

                    Regards,

                    Pritam

This reply was deleted.

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