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Aerial Photography and Video > GS-1 Gyro Servo...
 
 
Martin A
Heliman
Location: Gothenburg - Sweden

My Posts This: Topic  Forum		Hi,

Does any body us this GS-1, gyro servo for your AP system?
Howe dose it work? Are You satisfied?

I´m about to build a new gimbal to my helicopter and I'm thinking about to us this GS-1 for roll and tilt.

GS-1 Gyro Servo: http://www.dunehaven.com/gs1.htm

Thankful for answers.

//Martin
10-19-2009 11:09 AM
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SeismicCWave
Veteran
Location: Hilo, Hawaii

My Posts This: Topic  Forum		No but I just ordered one to try.
10-19-2009 06:35 PM
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fionn
Senior Heliman
Location: Ireland

My Posts This: Topic  Forum		I'd imagine it should be no better or worse than using a normal tail gyro externally but it's certainly very nice to have everything enclosed within a servo case and ideal for smaller video mounts.
10-19-2009 07:58 PM
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SeismicCWave
Veteran
Location: Hilo, Hawaii

My Posts This: Topic  Forum		I am very interested in seeing how good/bad is the drift.
10-19-2009 08:00 PM
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fionn
Senior Heliman
Location: Ireland

My Posts This: Topic  Forum		I'd expect it to be like that of a normal gyro used in this way.
The seller freely admits that it drifts during banked turns etc. No gyro can be drift free unfortunately without some external reference.
10-19-2009 08:14 PM
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SeismicCWave
Veteran
Location: Hilo, Hawaii

My Posts This: Topic  Forum		>>The seller freely admits that it drifts during banked turns etc. No gyro can be drift free unfortunately without some external reference.<<

Very true. Right now I am only using the gyro as a dampener for small movements instead of a position fix for the gimbal. Until GeorgeM has enough of his IMU for sale.
10-19-2009 08:43 PM
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Martin A
Heliman
Location: Gothenburg - Sweden

My Posts This: Topic  Forum		Hi,

When I build my gumball with 360 servo and tail gyro I always have problem with that the gyro compensate more one way than it compensate thee other way, and than the gumball drifts more and more for every compensation.

And in the feature for the GS-1 You can read: ◦Automatic gyro drift cancellation
So I expect this gyro-servo not to drift...

I also wonder how smooth it works or if it stuttering when it compensate?

/Martin
10-20-2009 09:07 AM
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SeismicCWave
Veteran
Location: Hilo, Hawaii

My Posts This: Topic  Forum		>>And in the feature for the GS-1 You can read: ◦Automatic gyro drift cancellation
So I expect this gyro-servo not to drift...<<

Since it is a proportional servo with a gyro I don't expect it to drift very much. It all depends on the software of the gyro. If it is too much like the heading hold gyro it will drift a bit but if it is more like a rate gyro it will want to return to the last position eventually and will probably not drift much.

>>I also wonder how smooth it works or if it stuttering when it compensate?<<

That will depends on the mounting, inertia and amount of vibration. The servo is not very strong so a flexible mount with a heavy camera will make the unit stutter.

For the amount of money I am not expecting a lot from the unit. If it can dampen the small movement on my camera gimbal enough to shoot at a slower shutter speed I will be happy.
10-20-2009 09:29 AM
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Martin A
Heliman
Location: Gothenburg - Sweden

My Posts This: Topic  Forum		Hi,

Do you think its possible to us the GS-1 together with a Camera Position Controller? http://www.dionysusdesign.com/produ...products_id/173

//Martin
10-20-2009 10:44 AM
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SeismicCWave
Veteran
Location: Hilo, Hawaii

My Posts This: Topic  Forum		>>Do you think its possible to us the GS-1 together with a Camera Position Controller? <<

It may slow down the GS1 but I don't think it will work together very well. The camera position controller is only playing with the speed of the servo. The operator still has to determine the ultimate position. If the operator cannot see the camera or have a downlink monitor he/she cannot stop the camera from moving.

I don't think it will correct the drift from the GS-1 if there is any.

The proper solution is to use an IMU like GeorgeM is developing or to use a very expensive positioning device with true Kalman algorithm.

Triax is developing a setup also and it is proving pretty interesting.

Edit:

Clarification on Kalman algorithm. That is to use various sensors to determine the virtual position of the camera gimbal. The sensors give different input at different level of accuracy in different time frame. Such as inertia sensor or accelerometer that gives immediate feedback on movement but no relative position information. Gravitational sensor that give some relative positional data but not very sensitive feedback on immediate movement. GPS position that will give very accurate positional information but takes a long time to figure immediate movement compare to the accelerometer. Kalman algorithm take the information from all three sensors and update the computer to keep the camera gimbal in place.
10-20-2009 06:36 PM
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Envision
Veteran
Location: MI

My Posts This: Topic  Forum		In sustained banked turns, after a few seconds the GS-1 returns to center and the camera once again is aligned with the aircraft. Once the aircraft levels, the GS-1 will keep the camera in the previous banked position for a few seconds before re leveling. Same with forward flight tilting. I have a few for testing. Nothing to show for a few weeks.

Troy
10-20-2009 09:21 PM
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Martin A
Heliman
Location: Gothenburg - Sweden

My Posts This: Topic  Forum		Hi,

Now I have order tow GS-1 to see how they wourk. I´l come back with detail later.

//Martin
10-22-2009 07:44 PM
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SeismicCWave
Veteran
Location: Hilo, Hawaii

My Posts This: Topic  Forum		I just received my GS-1 today. I think it has potential. Very simple setup if your camera gimbal uses a direct drive Futaba servo. The spline on the GS-1 is compatible with Futaba spline. I have a simple tilt gimbal from Servo City so I am using that as a test bed. I just have to fabricate some mount to hang the gimbal on one of my camera mount. Right now the simplest is to hang it on the Photoship One 2XPT. I just take off the gimbal and substitute the Servo City one with the GS-1.

Testing it by hand yields very good result. As soon as I move the mount the cradle will try to stay level or the same attitude as much as possible. If I go over board the servo will slowly move back to the last position. So far it shows very little drift.

It acts like a very nice rate gyro with a sensitive servo. the slew rate is reasonable and not jittery at all.

I can't wait to test it out.
10-24-2009 08:46 AM
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SeismicCWave
Veteran
Location: Hilo, Hawaii

My Posts This: Topic  Forum		It worked and worked pretty well.

I tested the GS1 this afternoon and shot a video. I loaded up two and a half minutes worth to my apple mobile me website. There were a few jerkiness in the video. Some of them was me moving the slider on the tx to reposition the camera gimbal. The other one was when I tested the gyro by moving the elevator stick really hard and fast.

Here is the link. I made the video public so you can view it.

http://gallery.me.com/hansentsang/100209

It was pretty windy today and I get a lot of bounce. You can see some roll movement but very little pitch movement. The video is straight from the camera with no stabilizing.

Edit:

There were no camera drift either.
10-25-2009 03:37 AM
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Makiedog
Senior Heliman
Location: Minneapolis

My Posts This: Topic  Forum		Was the servo driving a larger gear for pitch? Or was it a direct drive? Looks pretty impressive!

Pat L
10-25-2009 04:12 AM
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SeismicCWave
Veteran
Location: Hilo, Hawaii

My Posts This: Topic  Forum		>>Was the servo driving a larger gear for pitch? Or was it a direct drive? Looks pretty impressive!<<

ON this setup it was a direct drive.

Edit, a picture is worth a thousand words. So here are a couple. Can't get any simpler than that.

10-25-2009 04:51 AM
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Martin A
Heliman
Location: Gothenburg - Sweden

My Posts This: Topic  Forum		Hi Seismicwave,

It´s nice to her that you are positive surprised of the GS-1 servo

I can't see the video you did, I only get a wight screen and the sound. The same happend to my friend.

//Martin
10-25-2009 09:45 AM
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GeorgeM
Senior Heliman
Location: Europe

My Posts This: Topic  Forum		I saw it..

Probably you need to have Quicktime codec installed ??

BTW.. if you are using Firefox as your Internet browser, it could be that you might have some issues with installing Quicktime, as for some time ( in the near past ), the two didn't like each other so much.
10-25-2009 11:25 AM
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denizcan
Heliman
Location: Ankara - Turkey

My Posts This: Topic  Forum		It will work, but its axis must be orthogonal (perpendicular) to the axises it does not control.. If you miss that, it won't be able to discriminate the rotation on the other axis and on its axis.. That means if you turn right, it may bend the camera down etc.. If it doesn't have another closed loop reference, it will drift..

I had done the similar thing in the past. I put accelerometer and gyro in a box:



The wire mass and open window was just for debugging purposes.

I called it Vertical Gyro (I was using it first in vertical direction.. :P). It was drift free, and I was surprised that it was far more better than famous GY401 if you used it on tail by disabling the accelerometer correction.. BTW: The coin is 1TL, it has same physical properties of 1 Euro (which is 2.2 TL :P)

Than I started calling it Vertigo, because its second axis (which was roll) was affected by the yaw etc.. I calculated the affect but just wanted to see.

To make it short: If you use only 1 of this, on the very first axis, it works nice.. For instance if you have roll pitch system, it may stabilize roll.. But many of you have yaw-pitch-roll system and want to stabilize roll.. Than you cannot with this..

Also, because of you installed without any reduction, it will be a little jerky..
10-26-2009 10:45 AM
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GeorgeM
Senior Heliman
Location: Europe

My Posts This: Topic  Forum		@ Denzincan..

Hello Lisy !!



George
10-26-2009 03:11 PM
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