Xbee Series 2 localization

Other & Legacy Products
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1

Hi guys, Im playing with some Xbee’s modules. i made a small mesh network having 1 Coordinator + 1 Router + 1 End Device (All in API mode)

I’am trying to track the EndDevice :
1- i used the node discovery command (ND) from the Coordinator but it seems that this command list all the node’s network and not only the nearby Xbee’s.
2- i have tried the RSSI mecanisme and used the DB command but seems to give the RSSI from the last hope only !

I really don’t know what to do next …

Any hints are welcome. Thanks

2

Hi Sad,

That’s correct. ND will find all nodes on the network, at least in theory.

DB will only show you the RSSI on the last received packet.

Keith

3

Hi Keith,
Any idea how to implement an RTLS system using a mesh network with XBee ZB S2 ?

I have started like this :
1- From the End Device i do a ND cmd
2- For each ND response, i send a ping to the node if it is a Router
3- From the Router : i receive the Ping and do a DB command to get the RSSI

But i won’t get the correct RSSI as will get the RSSI of the last hop !!

Best regards

4

Hi Keith,

Sorry for being late.

I have switched to Xbee S1 so that i can get easily the RSSI without caring about ‘hops’ as no mesh any more.

Here is my setup : http://www.casimages.com/img.php?i=131113032946894827.png

Xbee N°4 has internet access
Xbee’s N°2 and N°3 are fixed into the wall
Xbee N°1 is the mobile one.

XB1 is broadcasting each 5sec
XB2 and XB3 are listening and once they get a message from XB1 they get the RSSI from it.

==> Now the question is how can XB2 & XB3 transmit the final result to the gateway (XB4). ? in my situation only XB3 can transmit to the gateway as it is in the range. but not XB2.

Mesh would be helpful here but i cannot use it in that kind of projects due to the last hop issue …

Any hints are welcome. and sorry for my bad English
BR