Replies to This Discussion

Permalink Reply by surndliha on April 26, 2012 at 11:10pm

Might be a bad connection, check telemetry logs to see if something interesting there.

Permalink Reply by maroFX on April 28, 2012 at 3:00am

Look at my logs for 3rc channel and manual boost. There are signal drops with no reason. Connections are reliable. I use Futaba 10C transmiter and 14FS receiver and they work perfectly.  All raw data from 6 sensors work great.

The most interesting is I don't see any problem without propellers.  Might it be a problem with high current?  I have Lipo directly under the main board.

DeveloperPermalink Reply by Adam Rivera on April 28, 2012 at 10:11am

Can you graph your barometric pressure altitude along with rc3 servo out?

Permalink Reply by maroFX on April 28, 2012 at 12:41pm

Yes, that's the log for  barometric presure (green),  rc3_OUT (red) and  thr_IN (blue):

It seems the radio input looks ok, but it doesn't match to rc3out. Could it be something wrong with pressure sensor ?

DeveloperPermalink Reply by Randy on April 28, 2012 at 5:08pm

It is weird that the throttle in doesn't match with the rc3_out.  It's possible that the short downward spike from the receiver's channel 3 was missed in the logging because it simply didn't catch it.

Do you have an xbee?  If "yes" could you try disconnecting it to see if that resoves the problem?  I'm not saying that's a permanent solution but if it does it narrows down the problem a lot.

Can you post your logs as well?

 

Also if you have an atmel programmer, could you try upgrading the ppm encoder software according to this wiki page?  I fly using the "ArduPPM_v0.9.87_Arducopter-APMv1.4.hex" version found in the downloads area.

Permalink Reply by maroFX on April 29, 2012 at 6:25am

I dont use the Xbee telemetry system and no other systems. Only Futaba FASST one-way transmission.  I heard something about PPM encoder update but i thougt it is normaly updated with other APM software. Some time ago I posted about channel interferences. Definitely channel 5()flight mode) disturbed to  channel 4 and yaw still jumped. I had to  reduce end-points to 75% and problem was gone. Maybe APM have some problems in decoding  Futaba channel system? Some experiences?

3D RoboticsPermalink Reply by Chris Anderson on April 29, 2012 at 8:12am

No the PPM encoder can only be updated with a special AVR programmer. If you have an early APM 1 this could be the issue. When did you get yours?

I use the Futaba radios and don't see any issues, but I also have boards with the current PPM encoder.

Permalink Reply by maroFX on May 1, 2012 at 1:25pm

I bought all electronic in www.jdrones.com,   exactly CPU 2560. Is there something for updating (PPM encoder ?) or this version should work correctly ?

DeveloperPermalink Reply by jasonshort on April 28, 2012 at 1:22pm

You really need to double check the wires from the radio. This will certainly cause the situation. I've personally seen motors act this way because of a broken RC cable. The cable will break right at the back of the crimp connector where all the stress is. The plastic will hold the wires together, but the vibrations will cause the drop outs.

Jason

Permalink Reply by maroFX on April 28, 2012 at 3:44pm

thanks for suggestion, I'll check wires again.

I soldered the cables from servo 1mm connectors and quite good quality wires. All signal cables were connected with epoxy glue additionally.  

Permalink Reply by Jack Crossfire on April 28, 2012 at 1:26pm

Motor holiday.

DeveloperPermalink Reply by Andreas M. Antonopoulos on April 28, 2012 at 1:44pm

low battery ESC failsafe cutoff? Has happened to me. Basically, in a plane the engine would start cutting out, making ti obvious from the ground that you're about to run out of battery. WIth a plane that glides, that's not a bad idea... with a helicopter, not so good. So the ESC has a voltage cutoff perhaps. if it is programmable you can also set whether it cuts engines at high/medium/low voltage to make it more or less sensitive. 

So, possibly just need to charge your LiPo?

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