Replies to This Discussion

Permalink Reply by Alan Jump on December 28, 2012 at 8:03am

Presuming you're talking about the RC side of the operation, absolutely...that's how transmitters with multi-model memories function. :-)

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Permalink Reply by Marcin Krawczyk on December 28, 2012 at 8:04am

You can set 2 air radios with same parameters.

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Permalink Reply by Josh Potter on December 28, 2012 at 8:12am

Alan, I was talking in specific to the 3dr packet radios.

Thanks for the help!

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Permalink Reply by Scott Berfield on December 28, 2012 at 11:32am

I have a single 3DR ground-side 915 MHz radio and use it ith 2 air-side ones (obviously not simultaneously :)) with no problem.

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Permalink Reply by Neil Ohnemus on January 4, 2013 at 6:08pm

I have a similar question:

Can I use multiple air radios with a single ground unit at the same time?

I would like to control a handful of drones from GCS. 

Mav link can use up to 255 devices from what I have read, but I dont understand if I would need a 1 to 1 ratio of air to ground units or if I can use many to one?

From the radio perspective is this possible?

From the code perspective I know it needs work.

Thanks!

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Permalink Reply by Marcin Krawczyk on January 6, 2013 at 6:17am

You cen setup mutiple radios for LISTENING only (DUTY CYCLE=0), and only two radios with same NET ID can be bidirectional at the same time.

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Permalink Reply by Neil Ohnemus on January 6, 2013 at 6:58am

What kind of work would be needed to create a mesh that allows for all devices to communicate with each other? 

I'm thinking something like a (only talk if no one else is talking and only listen for a header that has your mavlink ID in it. 

Shouldnt need to be complex like tcp/ip as there are only a small amount of devices involved.

Maybe something like token ring where a token is handed between drone devices to allow each drone a timeslice to speak to gcs. Then sending telemetry bursts every say 10ms.

I need all radios to be able to command and send data. IS the NET ID something that can be worked around in software? (Is it a hardware or software connotation?)

Thanks for your thoughts!

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Permalink Reply by Chris Card on January 6, 2013 at 8:11am

There are two recent posts where this question is raised.

http://diydrones.com/forum/topics/multiple-uavs-with-one-ground-sta...

   and

http://diydrones.com/profiles/blogs/hardware-in-loop-simulation-for...

The NET ID is an address for the radio (3DR radio).

The radios will not associate unless the NET ID's match.

The APM parameter SYSD_THISMAV  can be used to identify each MAV, of course the GCS needs to be able to support multiple vehicles.

The Xbee radios can do mesh networking with automatic route (data path) discovery.

Here is a link to the XbeePro900 manual...    

    http://www.digi.com/products/wireless-wired-embedded-solutions/zigb...

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