Developer Comment by Max Levine on July 24, 2011 at 9:31pm

wow nice :)

what Xbee you used ?

And can you share the code ?

Comment by arashi on July 24, 2011 at 9:43pm

Does this work with the mavlink protocol?

Comment by Earl on July 24, 2011 at 10:17pm

Legacy now. Working on mavlink.!

900 xbee for longer range.

program the xBee's one as coordinator and other ones as endpoints make coradanator to add dh 0 and dl FFFF

this goes in plane

the ones on ground in tx are end pointes with the hi and low address of the plane.

Moderator Comment by Alex on July 25, 2011 at 1:00am

Great work, i was wondering where you bought your er9x from?  I know you can get them from HK (turnigy version) but they are always out of stock

Admin Comment by Thomas J Coyle III on July 25, 2011 at 4:30am

Earl,

The 900MHz Xbees and really designed for point to point. Why are you using them in the Mesh mode?

Regards,

TCIII

Comment by Sean Skirvin on July 25, 2011 at 6:53am

I bought that same FS ($89) from nitroplanes.com. There selection is not the greatest, but unlike HK, they don't tease you in with out of stock, or only "international" items.

Comment by Earl on July 25, 2011 at 8:58am

Xbees can do point to multipoint. It took me a while to fugure it out tho.

The coordinator xbee DH = 0 and DL = FFFF also the CE = 1 This goes in plane.

The end point xBee(s) CE = 0 and DH DL = address of xBee in plane.

 

Now my er9x recieves the data ANDound station ALSO recieves the data.

It took me several days pouring over digi's data info and searching the web.

So thats how point to multipoint works. (at least for me)

 

The code is programmed into the er9x. Follow this thread. I wrote the ardupilot section.

http://www.rcgroups.com/forums/showthread.php?t=1266162

 

Neat !! Especially with the 2 antennas on TX

 

I bought mine a yeaHK. They don't stay in stock. They go like hotcakes! There is a place in US that sells them and they are generally in stock but the price is $89. Still a good deal.

 

Programmer from Sparkfun for $15.

Earl

 

Comment by Earl on July 25, 2011 at 9:03am

I would like someone to help me do a version for mavlink. This version is legacy only. It's been a while sense I was programming. It's in 'C' like language.

Earl

Comment by Kirill on July 25, 2011 at 9:17am

Earl, could you tell more, please, about connection and communication with LCD?

Comment by Earl on July 25, 2011 at 11:22am

The xBee connects to the mosi and moso pins on the cpu in the er9x tx. that is the tx and rx lines. you must reprogram the er9x tx with the firmware I referred to a few posts up. It does take some soldering, or as an alternitive there is a programmer and backlight that just screws onto the ckt board with spring loaded pins to make connections. You then can solder the xbee tx rx to this board. Read up on the er9x firmware mod...

Earl

 

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