gtranquilla

PITCH axis anomaly
I no longer use BGC 3.1, moved far beyond that version on my 32 bit 3 axis BGC system. But in general, be prepared to do battle getting it tuned as before...... If you have a 3 axis BGC then you have three tigers by the tail. PID loop control theory…

Comment by gtranquilla April 2015 permalink
Basecam32 versions
Belden instrumentation wire follows the concept of using both twisted pairs or twisted triad wiring in combination with shielding..... but it is critical that the shielding be grounded at one end only. Ideally the ground should also be earth ground …

Comment by gtranquilla October 2014 permalink
"Auto"tuning
I was wrong....... Auto tuning does work now that I have finally loaded the new firmware and tested it.

Comment by gtranquilla October 2014 permalink
follow mode - how to?
dbeaty2, Any chance you can provide better guidance to your blog on follow mode setup?..... can't seem to locate it!

Comment by gtranquilla July 2014 permalink
follow mode - how to?
DBeaty or others, I get the impression that the speed versus angle control is the better way to go for stable RC yaw override while in follow mode.

Comment by gtranquilla July 2014 permalink
Changing profiles during flight
Thanks again Garug..... enjoyed your RCGroups postings/article etc. I have a spare Pololu PWM switch which could work possibly without wetting the output to the BGC without need of 5VDC... I would assume. https://solarbotics.com/product/17677/ Howe…

Comment by gtranquilla July 2014 permalink
Yaw unstable only in Aerial Follow Mode
More info: My camera and BGC system is mounted on the Cinestar tripod landing gear assembly that must all rotate together. Since the tripod landing gear adds a lot of angular momentum I upsized the Yaw motor to an iPower GMB4008 150T 22 pole motor. …

Comment by gtranquilla July 2014 permalink
actual PID algorithm
icecream..... the first part after the 2nd equal sign is the proportional variable, i.e., Kp the 2nd part is the Integral variable, i.e., Ki the 3rd part is the Derivative variable, i.e., Kd. Proportional is the one and only component that does not …

Comment by gtranquilla July 2014 permalink
Changing profiles during flight
Garug.... Yes.... I have since thought that might be the case..... but since I already used up all PWM inputs including external FC gimbal roll and pitch inputs I was hoping there would be another PWM input option for CMD so that I could utilize all…

Comment by gtranquilla July 2014 permalink
Changing profiles during flight
I have the CMD switch configured to change profiles, but how does one connect the RC receiver cable to the 32 bit 3 axis board? Do I connect to the aux1 2 or 3 pins or somewhere else?

Comment by gtranquilla July 2014 permalink
ARMBGC Terrible Customer Service
What I respect most is that individuals of a professional mind set will take the time to read the material 2 or more times, struggle thru it to get familiar with it, troubleshoot and then.... when all due diligence fails..... start to post for supp…

Comment by gtranquilla July 2014 permalink
Get rid of follow mode
If your yaw axis is not well balanced, the camera will tend to rotate in forward flight on when hovering in wind since the heavy side wants to go to the lowest spot. If yaw axis is carefully balanced then make sure you have de-activated the "fo…

Comment by gtranquilla July 2014 permalink
actual PID algorithm
PID loop tuning in Multirotors and BGC systems is a signficant deviation from the conventional industrial world of automation PID tuning concepts reference: http://www.amazon.com/Process-Control-Systems-Application-Design/dp/0070571015 I had the sp…

Comment by gtranquilla July 2014 permalink
Alexmos "Auto Tuning"
The concept of auto-tuning was promoted back in the mid 80's as a PID controller with "artificial intelligence". It self-tunes to achieve the optimum which is considered as 1/4 wave dampening...... a brief overshoot, fast reset and a …

Comment by gtranquilla July 2014 permalink
inaccurate yaw (aerial)
Are you rotating both camera and landing gear as in the Cinestar 6 or 8 tripod yaw motor cage landing gear or just the camera. The tripod yaw motor cage adds a lot of extra rotational momentum that has to be overcome with Yaw PID loop control. It ca…

Comment by gtranquilla July 2014 permalink
Yaw slow in follow mode
Thanks Garug and zsntiancai.... very helpful.

Comment by gtranquilla July 2014 permalink
RC issues
Double check your wiring between RC Rx and BGC board. Then doublecheck your BGC configuration to ensure that there is no mixing and each input is correctly assigned, i.e., using the correct versus alternate profile etc. If that does not solve the pr…

Comment by gtranquilla July 2014 permalink
Advantages of 3-axis over 2-axis for UAV?
Another benefit of having the yaw axis working is that a straight line heading towards a target can be maintained aoutmatically even if the Multirotor tends to yaw during the flight due to crosswinds etc. Best example is a flight from a fairway teeb…

Comment by gtranquilla July 2014 permalink
Configuring Yaw control on Cinestar 8 caged landing gear
Thanks Garug, Next question.... I can't find a wiring diagram to show how the CMD function is controlled via hardwired input. I assume I need to connect to Aux 1, 2 or 3 input on the BGC board..... but I need a return signal to ground path and …

Comment by gtranquilla July 2014 permalink
FC wiring to FC roll and FC pitch
Thanks all.... power lead removed so that BGC does not have input power from multiple sources. All is working now. But I want to make use of RC Rx channel 5 to drive the BGC "cmd" so that I can changes profiles while in flight. But the aux…

Comment by gtranquilla July 2014 permalink
Using F.C. inputs on a three axis gimbal.
I full featured IMU will have 9 to 12 DOF, 3 accel, 3 gyros, 3 magnetometers., etc....and they are larger and more expensive. So IMHO is is not quite appropriate to call these sensors for the BaseCAM BGC, IMUs. FC pitch and roll data access can help…

Comment by gtranquilla July 2014 permalink
Using F.C. inputs on a three axis gimbal.
Very good question..... I have been wondering about that as well since most FCs do not output gimbal yaw control via pwm...... perhaps s.bus would carry all the data including magnetometer data for horizon position..... but not yet likely.

Comment by gtranquilla July 2014 permalink
Battery placement
IMHO -best place would be on MR airframe above the BGC 2 or 3 axis system but that would require running the power wires down thru the yaw motor hollow shaft. 2nd best place would be under the yaw motor at the center of it's vertical axis but w…

Comment by gtranquilla July 2014 permalink
Yaw motors aims camera backwards
Resolved once I recalibrated frame IMU gyros.

Comment by gtranquilla July 2014 permalink
RC Settings - No action explanation
I had similar issue. Calibrated frame IMU gyro and problem disappeared!

Comment by gtranquilla July 2014 permalink
Many open questions...32 bit
I am having same issues.....

Comment by gtranquilla July 2014 permalink
32bit bug detected when yaw upside down
Seems I have a similar issue. The red ball in the top compass needle graphic continually spins around while the BGC yaw motor rotates until the camera is pointed 180 degrees away from the MR heading. How do I fix this issue?

Comment by gtranquilla July 2014 permalink
3s or 4s which is best ?
Stick with the 3S IMHO....... If you need more run time just up the maH rating of the 3S.

Comment by gtranquilla July 2014 permalink
8 bits or 32 bits for a 2 axis Gimbal?
Only one hour.....? It took me about 7 hours.... then I reviewed the website notice as it was not posted by the supplier or in the documentation. In the process a power cable to the 3 axis board fell out. When I reconnected it.... bang.... no more 3…

Comment by gtranquilla July 2014 permalink
Pitch control on Alexmos board
Try connecting your Futaba 14SG receiver to a couple of standard RC servos and prove that works first. The rest is much simpler after completing this initial step.

Comment by gtranquilla July 2014 permalink

More Comments

Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

About

Username: gtranquilla
Joined: August 2013
Visits: 28
Last Active: April 2015
Roles: Member