Confusion about which Sonar modules are recommended for Altitude Hold

Hello,
In the AC2 wiki manual here:
http://code.google.com/p/arducopter/wiki/AC2_Sonar
it says
"Due to the narrow beam width, the recommended sonars for altitude hold are the Maxbotix LV-EZ0 and XL-Maxsonar EZ0"

However, the members of these families with the narrowest beam width are the EZ4 versions not EZ0.
The pictures in the same manual article show sonar devices that are labelled EZ4, so there is a conflict within the article itself.

Please can someone clear up the issue and confirm whether the EZ0, EZ1, EZ2, EZ3 or EZ4 version is best for altitude hold?

Does altitude hold work in the recent Beta 2.0.5? Does it behave the same as STABILIZE mode, but with altitude hold in addition?

Thanks very much, wonderful job guys.
Rob

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Replies to This Discussion

Permalink Reply by Limebear (Rob) on May 21, 2011 at 10:09pm

As there are no comments on this yet, what Sonar module are You using successfully?

Thanks

Rob


DistributorPermalink Reply by Jani Hirvinen on May 21, 2011 at 11:25pm
EZ0 is default sonar what development team uses, EZ4 is good when you want to have really accurate alt hold on top of solid materials. Eg. You fly on staircases, outside on rocky areas and so on.

Only difference between ez0 and ez4 is the width of the beam. Ez4 is less sensitice for softmaterials. Ez0 is less sensitive for small items.

Take ez0 and it will rather good allrounder.

Software is on its beta stage and it improves daily. Lately we have been improving a lot alt hold and latest AC code is now somewhere at 2.0.10. I have flown weeks ago and already got rathwr good alt hold.

If you are not afraid of bugs you can try latest codes but if you are. Dont use. Just few days ago there were few nasty bugs that fired qua full speed to sky :)

That is now fixed. .
Permalink Reply by Limebear (Rob) on May 22, 2011 at 5:00am

Thanks Jani for clarifying that; I'll either get an EZ0 as you recommend, or maybe compromise and get an EZ1 or EZ2.

Rob

Permalink Reply by dudz on February 22, 2012 at 8:52am

Hi Jani,

 What would you recommend for the open countryside around forests,fields and streams ? There are alot of trees near me !

 


DistributorPermalink Reply by Jani Hirvinen on February 23, 2012 at 4:47am

EZ0 is always good as it has widest beam, trees/grass etc is really soft and gives "bad" signal back so wide beam is ok

Permalink Reply by Andrew Adams on February 23, 2012 at 5:36am

The manual shows the MB1200 sonar, which is what i'm assuming Jani is suggesting. My question is, what is the difference between the MB1200 and the MB1000?


DistributorPermalink Reply by Jani Hirvinen on February 23, 2012 at 5:38am

Yes both are ok and both have EZ0. Difference between 1200/1000 is that 1000 works till 3-4 meters and 1200 up to 7-8 meters.

Permalink Reply by Andrew Adams on February 23, 2012 at 5:40am

1200 it is then.

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