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21
General Discussion / Re: two servos gimbal problem
« Last post by TheOtherCliff on July 12, 2019, 03:58:10 pm »
2S Lipo is too much voltage for some kinds of servos.  You should use a voltage regulator like BEC or ESC/BEC to reduce voltage to 5V.

Using USB 5V power works well, but does not have much current, but your small servos do not need much.  It is possible that your servos are burned out.  :(

Whatever voltage you put in the CC3D is exactly what you get out to power the servos.  It is a direct wire connection.
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General Discussion / Re: two servos gimbal problem
« Last post by facenorbert on July 12, 2019, 12:33:32 pm »
Since it is not working, I would start with exactly what that video does.  Only one servo.  Exact same setup.

I have done as you said procedure once again

What is the maximum current (Amps) of your power supply?  Probably not the problem if CC3D is working and servos do nothing at all.

I have used 2s lipo battery pack 7.4v
Connected to 1 channel plus and ground

I have never seen a PWM output get broken just by plugging a servo in wrong.  Do you know how to use oscilloscope well enough to know that PWM is not working?

I would say my knowledge is basic I am newbie in this matter but the wave form I have seen on oscilloscope was nothing like square and voltage was also questionable.
I will try with earplugs
And maybe another oscilloscope but next week

  I may recall incorrectly, but with some setups (GCS configurations) I think you must arm the CC3D for PWM to start.  Maybe set "always armed" in Input -> Arming and TImeOut to 0.  Do exactly what youtube says with no more and no less and get that working first?

I try this later

You could connect an earphone to PWM and ground.  Do not put it in your ear till after it is connected.  It may be fairly loud.  You should hear a buzzing sound to show that PWM is coming out of PWM connector.

And that I'll try later as well

What voltage did you set on the power supply?  Did you ever set more than 5 volts into the CC3D board?

One power source was from laptop USB port another from lipo 2s pack

If you have a very powerful (current/amps) power supply connected to CC3D and you short + and - on CC3D PWM connector, you can burn traces on CC3D.  Could also happen if very powerful power supply and very powerful servos are used.  What kind of servos are you using?  What is the stall current of the servo?

Smallest possible servos 1.5kg got it from AliExpress

I haven't shortened cables
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General Discussion / Re: two servos gimbal problem
« Last post by TheOtherCliff on July 12, 2019, 09:07:37 am »
Since it is not working, I would start with exactly what that video does.  Only one servo.  Exact same setup.

What is the maximum current (Amps) of your power supply?  Probably not the problem if CC3D is working and servos do nothing at all.

I have never seen a PWM output get broken just by plugging a servo in wrong.  Do you know how to use oscilloscope well enough to know that PWM is not working?  I may recall incorrectly, but with some setups (GCS configurations) I think you must arm the CC3D for PWM to start.  Maybe set "always armed" in Input -> Arming and TImeOut to 0.  Do exactly what youtube says with no more and no less and get that working first?

You could connect an earphone to PWM and ground.  Do not put it in your ear till after it is connected.  It may be fairly loud.  You should hear a buzzing sound to show that PWM is coming out of PWM connector.

What voltage did you set on the power supply?  Did you ever set more than 5 volts into the CC3D board?

If you have a very powerful (current/amps) power supply connected to CC3D and you short + and - on CC3D PWM connector, you can burn traces on CC3D.  Could also happen if very powerful power supply and very powerful servos are used.  What kind of servos are you using?  What is the stall current of the servo?
24
General Discussion / Re: two servos gimbal problem
« Last post by facenorbert on July 12, 2019, 08:32:35 am »

1 - I suspect that the servos stopped working because the electrical servo power went way high when the servos started jumping around.  You need a more powerful electrical power source.  I would not expect that anything was actually damaged.  When did it stop shaking: when you changed a configuration?  Did anything get hot?  Was there any smoke smell?  Smoke is always something breaking.  Hot may or may not be something breaking.

 I have used external power source nothing went hot and was no smell.
Thank you

25
General Discussion / Re: two servos gimbal problem
« Last post by facenorbert on July 12, 2019, 06:31:01 am »
Hello thank you for your answer
I have done this setup

I paste YouTube link below there is a guy
Called painless360 on YouTube
He has explained how to do simple one servo cc3d pitch setup
I added one more servo so in my was similar but two servos gimbal

Cliff changed the link to youtube.com so it works on this forum


Now if I connect cc3d to CGS it looks like works fine gyro kompas move while I am moving cc3d.
What it looks like it's there is no PWM signal on an output pins
Servos don't move at all now.
Have reset cc3d and whole process all over again
Still no move
But still nothing
26
General Discussion / Re: two servos gimbal problem
« Last post by TheOtherCliff on July 11, 2019, 06:46:56 pm »
I assume the CC3D is not controlling any vehicle stabilization and that it only keeps itself level, and the camera that is attached where CC3D is attached.

Does it work when the camera is removed?  Did it ever work with camera removed?  These are big questions that gets past 90% of the questions.

There is more than one way to build and more than one way to set up (GCS configuration) what you describe.  Please describe how it is built (example: servos, CC3D, and camera are all mounted on a platform which tilts when the servos move), and the configurations you made using the GCS.  Please also attach your UAV settings file (File->ExportUAV...) to your next post.

Is this a standard setup where one servo pitches up and down and the other servo rolls left and right?

There may be two problems here.

1 - I suspect that the servos stopped working because the electrical servo power went way high when the servos started jumping around.  You need a more powerful electrical power source.  I would not expect that anything was actually damaged.  When did it stop shaking: when you changed a configuration?  Did anything get hot?  Was there any smoke smell?  Smoke is always something breaking.  Hot may or may not be something breaking.

2 - The servos may be jumping around because the PID (the stabilization) needs tuning.  The PID was default tuned to work with ESCs controlling quadcopter motors.  These respond much faster than servos do so the servos oscillate.  If this is the problem, the solution may be to reduce:
Configuration->Stabilization->(Basic->SettingsBank1)->Responsiveness->Rate

It is also possible that you have your left-right servo plugged in where the up-down servo should plug in.

Servos jumping back and forth is a different problem than servos going all the way over to one side.

You must start by having CC3D mounted (attached) with small CC3D arrow pointing forward (and servo connectors on right-hand side) or telling the configuration (using GCS) that it is mounted in your special way. Then correctly plugging left-right servo where it is supposed to go (etc.), then you need to reverse the servo on the Output page if servo goes all the way over to one side.

It helps to start with to have servo plugged in but leave servo mechanical linkage disconnected.  That way the servos will not go all the way to one side and you can see at least that your servos move when you tilt the CC3D.
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General Discussion / two servos gimbal problem
« Last post by facenorbert on July 11, 2019, 04:22:52 pm »
hello can anyone help me with this one
I ve used cc3d as a gimbal have connected two servo motors and was doing well. than i have put my small 60 grams camera on and after a while servos start going mad shaking up and down etc. and stoped working.
now if i connect my cc3d to computer looks like it   works ok ( only input is in red).  i have tested on osciloscope  it looks like there is no pwm signal and  all pins signal looks the same i am not so good with electronics yet. but do you think something was overloaded and than went wrong? all components looks ok.
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Thank-you for the help.  Next time I will be sure to post the UAV settings.  I ended up unstalling the version of the firmware I had and reinstalled the 16.09 release and everything is now working, I may have had a setting wrong or tried to use two different versions of firmware?  It was hard to isolate the exact problem because I had made several changes at the same time including rebuilding my quad, flashing and configuring new firmware, trying new locations for the flight controller etc. so it seemed like going back to a previous version of the firmware that I knew had worked in the past was the best way to help start to isolate the problem.  It looks now like my gyros are working fine so the problem was either in my configuration/firmware or electric noise as this was the first time I had tried to mount the flight controller in the center of the frame.

I really appreciate everything you are doing on this project, I am sure it is a lot of work.
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I suggest that you post your settings UAV file (File->ExportUavSettings) for us to look at.  :)

My guess is that you are running a new AttiEstAlgo (Attitude->Settings->AttiEstAlgo).  I would test with the old ones "Basic (Complementary)" or "GPS Navigation (INS13)" to see if the issue still happens since disabling "Wait until the board is steady" (and pressing Save, and rebooting the board) should fix this issue when it happens due to gyro hardware farther out of tolerance than expected.

You should also be aware that the board must be perfectly motionless for any AttiEstAlgo that uses Complementary/CF to initialize correctly.  It can see the motion if you are holding the board or aircraft in your hand or try to do it while riding a boat, etc.

I just checked my next build and it is r796, so you aren't running the latest next although 782 is the "released next".  ;)
https://librepilot.atlassian.net/wiki/spaces/LPDOC/pages/263913473/Next+Downloads
30
Hello,

I need some help.  I have a openpilot revolution board that I recently upgraded to firmware 16.09 +r782.  In trying to set up a new quadcopter build, I am encountering a problem.  I used the vehicle setup wizard and completed all of the calibrations.  In addition to the revolution board, I am running a u-blox based gps with magnetometer.  Now, I am getting a warning message in the "Flight Data/System Health" screen.  The message says "waiting for the board to be steady before gyro init".  The board/copter is perfectly level and not moving.  I've gone through the vehicle setup wizard and calibration procedure two times and am still getting the warning message. 

I also unchecked the "Wait until board is steady" option under Gyro Initialization on the attitude settings page to see if that would make a difference but it did not, I still get the warning message.

Any ideas what is wrong?

Thank-you.
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