I 've recently finished my first quadcopter build following the instructions exactly as they wer...

[G+_David Price]

I've recently finished my first quadcopter build following the instructions exactly as they were laid out in episode 122.  My quad flies fine for a few seconds but will randomly fall from the sky.  When I check out the KK 2.1.5 screen, it says Error: No yaw input.  This is the same error message that pops up if I turn off my Tx before disconnecting the battery from the quad.  I remember Padre said if these go out of range the Rx will chop all inputs, so it almost seems like that's the case, but I'm only flying about 30 ft. out...  I already swapped servo leads to eliminate that variable.

 

Does anyone have any ideas? Thanks!

[G+_Quadflyingmedic]

Not really familiar with the kk2. There is a large forum on the rcgroups website may be having a brownout to the fc or poor antenna placement. Some pics of your setup and the radio you are using may help

[G+_Eddie Foy]

Just shooting from the hip, but No Yaw Input sounds like an accelerometer based error.  Recalibrate?

  Although I can see it an xmitter issue.  Yaw zero would be center stick, so a PWM signal would be there.  That might be missing.  Check connections from RX to KK

[G+_Donald Burr]

Check the connections to your receiver, make sure they're in firmly and not shaking themselves loose. Could be a bad receiver wire too. Or even a bad/flaky receiver. It could even potentially be a bad flight controller board - highly unlikely but possible. During my first quad assembly attempt, I accidentally drove a screw through one of my receiver cables, which caused a short. Everything works fine except that the flight controller doesn't register any control inputs on Channel 6. No, it's not the receiver, I tried swapping in a different receiver (after I put in new receiver cable to replace the one I screwed) and got the same results.

[G+_MyTmou5]

No yaw input is generaly Displayed when there is no receiver input. Check your servo leads.

[G+_David Price]

Thanks everyone for the suggestions. I have the rx antenna on the rear "shelf" with it pointing out and looped back around in a hairpin configuration. I will try to let it dangle and see if that helps.

 

Also, I've changed the leads from the rx to the KK board but will change them again.

 

If those steps don't work I may look into flashing the KK firmware. I'd be venturing into unknown territory on that one, but I have nothing to lose since it doesn't work for more than a minute anyway.

 

After that, I'd probably replace the receiver.

[G+_Quadflyingmedic]

David Price flashing is not that bad. The first time is a little nerve wracking wondering if you have something backwards or not hooked up correct. But usually goes smooth if you follow directions!!

[G+_Eddie Foy]

If you think its the rx, try swapping yaw with, say roll. (At rx, not KK to rule out wire)  Controls will be wonky feeling, but see if problem moves.

  Also look for bad solder joints on kk