Replies to This Discussion

Permalink Reply by Kirill on October 4, 2011 at 12:27pm

Try to go to test -> altitude in CLI mode via APM Planner terminal for instance and see what it will show you...

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Permalink Reply by Alex on October 4, 2011 at 8:34pm

on the floor level it shows values between -0.11  -> 0.5 m. If i raise it manually  to aprox 2m  the readings are the same....

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Permalink Reply by Alex on October 5, 2011 at 6:52am

I've tried with other firmware versions, same problem. the only hardware change was when i  soldered the filter pads(2 weeks ago aprox.). The baro traces are near the filter pads ? Here is how i've solder : http://www.rcgroups.com/forums/showpost.php?p=19408439&postcoun...

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Permalink Reply by Kirill on October 5, 2011 at 10:45am

It seems to be showing right values, +-0.5m variations is normal for baro sensor.

Filter pads? Could you explain, please, what is it?

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Permalink Reply by Alex on October 5, 2011 at 10:56am

Filter pads, read here, at the bottom : http://code.google.com/p/arducopter/wiki/AC2Assembly

 

Ok, now i'm totally confused... i made another test: i blow in the sensor (normally, i think, that the values should go UUUUPPP) but nothing happends, same values... I'm on a step distance to replace the baro sensor...

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Permalink Reply by Kirill on October 5, 2011 at 12:32pm

Thanks for the link.. That's very sophisticated thing, you really might have damaged the sensor while soldering.

Yep, blowing in the sensor must cause changes...

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Permalink Reply by 3D Robotics Tech Support on October 5, 2011 at 4:11pm

Hi Alex,

The values should change for the tests that you've tried. You can also check to see if the ADC chip is working correctly: try running the ADC test in CLI mode and see if the gyro values are normal (around 1600)? If the gyro values are incorrect (i.e. 0 or 1) then there may be a problem with the ADC chip. If the gyro values are fine, then the pressure sensor is likely the problem.

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Permalink Reply by Alex on October 5, 2011 at 8:38pm

I've made a test 5 minutes ago. For several seconds i've moved it and after that i let it on the table. The values are in the txt file.Where is the problem ?  Thank you.

  P.S.  Now i've desoldered the filter pads.

Attachments:

• adc.txt, 43 KB

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Permalink Reply by 3D Robotics Tech Support on October 6, 2011 at 11:52am

Hi Alex,

Thanks for including the ADC test values. It looks like the ADC chip is fine, so most likely it's the pressure sensor.

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Permalink Reply by Alex on October 7, 2011 at 7:41am

Tomorrow i will change it and i will be back with the results. Thanks for help.

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Permalink Reply by Kirill on October 7, 2011 at 9:25am

Alex, good luck with changing!

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Permalink Reply by Alex on October 11, 2011 at 9:25am

The sensor is changed,made some tests indoor and it seems that is working. Hopefully tomorrow i will make an outdoor test.  Thanks for your help.

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