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Old May 08, 2010, 12:54 AM
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Joined Nov 2009
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my home made quadrotor is ustabled .help me

Hi
I know that you know about the detail of quad rotor.
I have big problem with my quad rotor. It would be better to explain my problem.
My program and my equipment cannot modify the less than 5 degree angle. When my quad rotor tilt to
Roll to 5 degree angle it does not modify that.and when the angel become the 6 degree the controller Throw its to other side rapidly .and the quadrotor is unstabled.




My equipment’s are:
ESC: CASTEL creation 35
Motor: Motrolfly
Prop: 12*4.5
Control loop Frequency: 25 Hz
Accuracy of AHRS: 0.1 degree
Would you tell me my problem?
Another question : How can I use the 500 Hz write to motors with my Esc`s?
Castel creation says that their ESC `s has the 11 bit resolution or 2048 step .with 500 Hz frequency for write the motors. How can I check it?
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Old May 08, 2010, 09:35 AM
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Joined Jun 2009
291 Posts
have your control board output data over serial to a terminal, you're probably having precision issues.

Also, 25 Hz PID loop is way too slow for a small quad. You need at least 100 Hz to even approach any resemblance of stability.
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Old May 09, 2010, 03:27 AM
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Joined Nov 2009
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Quote:
Originally Posted by tori3 View Post
have your control board output data over serial to a terminal, you're probably having precision issues.

Also, 25 Hz PID loop is way too slow for a small quad. You need at least 100 Hz to even approach any resemblance of stability.
How can i increase the PID loop frequency?

my first AHRS gives me 25 - 50 Hz frequency .

I think i must use the AHRS ,that gives me 100 or 200 HZ update rate.
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Last edited by sarabi; May 09, 2010 at 04:05 AM.
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