pixhawk won't arm

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

  • You didn't mention connecting the GPS / compass unit to the system. From what I understand, that's not optional hardware; it needs to be connected and calibrated before it'll fly. 

    • 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.

      • 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.

        • Well, that's quite a coincidence. After a small crash (more of a hard landing, really), my copter started doing the exact same thing. I reset it and replaced the GPS/compass unit, to no avail.

          I have no idea how to solve this problem; I actually created a user account to ask about it. I'm away from home and don't have the quad here with me, so I figured I'd wait.

          If you figure it out, I'm definitely interested.

          • 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.

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

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

              • 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.

                • Interesting. Definitely not my problem; I'll have to keep beating my head against a wall on that one I guess :)

                  • 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

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