Pizza
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Quadrotor balancing problem

Started May 23, 2011 0 Replies

Hi guys,I have attached videos of pitch and roll PID tuning video.Sensor filtering and PID loops are at 250Hz.I'm using only P and D.I don't know if it's good enough.I did not tune the yaw because i…Continue

Quadrotor PID control help please

Started this discussion. Last reply by Pizza Jan 24, 2011. 28 Replies

Hi all, i've been googling and reading up on plenty of projects and papers, but not much have been discussed about PID control and updating of PWM of quadrotor.from my understanding, there are 2 ways…Continue

quadrotor xbee replacing rc

Started this discussion. Last reply by wurpfel Sep 5, 2010. 4 Replies

what are the some of the difficulties you foresee if RC link is replaced with xbee link?i was thinking of starting by having a hover mode, indoors : fix a safe throttle that is able to lift off.…Continue

 

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Pizza posted a discussion

Quadrotor balancing problem

Hi guys,I have attached videos of pitch and roll PID tuning video.Sensor filtering and PID loops are at 250Hz.I'm using only P and D.I don't know if it's good enough.I did not tune the yaw because i don't know how to find a test stand, so I wanted to tune it in flight. I suppose without tuning yaw, pitch and roll will still balance but it will spin like a flying saucer.I've also attached videos of the quadrotor taking off while i push the throttle stick and crashing.See More
May 23, 2011
Pizza replied to Pizza's discussion Quadrotor PID control help please
"hey roy..here's the captures and data in excel if you are interested.. i am now using derivative from drift corrected gyroscope angular rate instead of derivative of angle from IMU. It is smoother in wave form but I'm not sure whether to…"
Jan 24, 2011
Pizza replied to Pizza's discussion Quadrotor PID control help please
"does anybody encounter problem with centre of gravity and pidcontrol? mine seems to be affecting a great deal."
Jan 19, 2011
Pizza replied to Pizza's discussion Quadrotor PID control help please
"hi roy/everyone, here's the additional information of vibration issues. I think it is due to vibrational noise of accelerometer in imu, that causes the Derivative calculated to be insane.  Therefore I'm trying to use bias compensated…"
Jan 17, 2011
Roy Brewer replied to Pizza's discussion Quadrotor PID control help please
"Limiting the feedback output (as Jason indicates) is one solution, but it can also lead to more problems. (I don't have ACM or aeroquad, BTW). Ultimately, your actuator is limited, of course, but we often want the control system to be able to…"
Jan 7, 2011
Roy Brewer replied to Pizza's discussion Quadrotor PID control help please
"Ideally, it should not oscillate +/- 10 degrees at all! If you had a linear issue (e.g. incorrect gain), the response should be a constant frequency (damped) sine wave. This appears to be a non-linear issue. Is there any additional information you…"
Jan 7, 2011

Developer
jasonshort replied to Pizza's discussion Quadrotor PID control help please
"Attitude.pde has the equations you need. In the library is the pid code, but I only use p right now. Therefore you can ignore it."
Jan 4, 2011
Faik Kaya replied to Pizza's discussion Quadrotor PID control help please
"Thank you for the reply Jason. Somehow i dont use any of the arducopter, aeroquad or some other code. I wrote all by myself cause my electronics are different, so i guess i need to study arducopter code and use modified version of it in my code. But…"
Jan 4, 2011

Developer
jasonshort replied to Pizza's discussion Quadrotor PID control help please
"Let me expand. Normally people think of PIDs when they want to regulate something like a thermostat. But thermostats don't rotate. What you care about is rate of rotation for a quad. Your quad may be tilted at 15°, but…"
Jan 4, 2011

Developer
jasonshort replied to Pizza's discussion Quadrotor PID control help please
"My point is if your pid terms are that sensitive you have other problems. Your dampening is wrong. You don't need to worry about the details you're looking at to get the performance you need."
Jan 4, 2011
Faik Kaya replied to Pizza's discussion Quadrotor PID control help please
"I have asked this on some other topics but i will ask here again. im kind of desperate about it, couldnt get any satisfying answer.  The question is im designing a quadrotor as an final project not as a hobby. so i built frame by hand using…"
Jan 4, 2011

Developer
jasonshort replied to Pizza's discussion Quadrotor PID control help please
"Please se the ACM code http://code.google.com/p/arducopter/source/browse/#svn%2Ftrunk%2FArduCopterMega It can fly perfectly stabilized with almost any kP value. Tuning is only a matter of deciding how responsive you want the quad to…"
Jan 4, 2011
Aniket Tatipamula replied to Pizza's discussion Quadrotor PID control help please
"i seem to face the same problems you faced !! have you fixed it !! i have also heard of LQR control !!have you tried it !!  "
Dec 30, 2010
Pizza replied to Pizza's discussion Quadrotor PID control help please
"Hi all does this curve look all right or is it supposed to be periodic"
Dec 28, 2010
Pizza replied to Pizza's discussion Quadrotor PID control help please
"Hi Dean thanks! but I think you have mixed up I-term and D-term. why would u suggest a negative I or D? could you explain what is integral windup/antiwindup?   from wikipedia: The integral term (when added to the proportional term) accelerates…"
Dec 23, 2010
Dean Lamborn replied to Pizza's discussion Quadrotor PID control help please
"The P term determines how hard the system responds to the error. If you set P to zero it won't react at all. Keep lowering P until the overshoot stops. At some low enough value you won't be supplying enough power to get to the zero point.…"
Dec 22, 2010

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