Hi, I recommend you to check out the RssiToSerial test (in my case located in tinyos-2.1.1/apps/tests/cc2420), where you can see an easy way to get the RSSI value read.
Kind regards, Al. On Sun, Feb 5, 2012 at 9:05 PM, Sergio Valcarcel <[email protected]>wrote: > Hi, > > mmm I think we are not understanding each other. > > What do you mean with GPS? If you mean Global Positioning System then what > is the relationship with a GPS? Are you interested in the RSSI or in the > Time of Arrival? In the former no GPS is necessary if the anchors position > are known and relative references are used. In the latter a specific radio > is required. > But I do not see where to use the GPS... > > For extracting the RSSI, you have to use the component of your radio (e.g. > CC2420PacketC.nc or something like that) and use the getrssi function > passing the pointer to the received packet. > > Apart of the tutorials, I encourage you to get into every directory of the > TinyOS folder and find the different components, and the functions they > offer. > > Good luck! > Sergio > > > > On Sun, Feb 5, 2012 at 7:31 PM, obinna oguejiofor <[email protected]>wrote: > >> Hi >> you are correct but am still having some challenges like (1) how can a >> make an ordinary node(telosb mote) to become a beacon node without using >> GPS (2) How can i measure the RSSI when two motes are communicating. >> >> your timely answers will be welcomed >> >> many thanks >> Obinna >> >> --- On *Thu, 2/2/12, Sergio Valcarcel <[email protected]>* wrote: >> >> >> From: Sergio Valcarcel <[email protected]> >> Subject: Re: [Tinyos-help] localisation of wireless sensor network using >> RSSI >> To: "obinna oguejiofor" <[email protected]> >> Cc: [email protected] >> Date: Thursday, February 2, 2012, 8:12 AM >> >> >> Hi Obinna, >> >> I do not quite understand your question. >> >> On one hand, IEEE 802.15.4 is a Medium Access Control protocol, i.e. it >> is in charge of sharing the air (more specifically the RF spectrum) to >> enable many users communicate in the same channel at almost the same time. >> >> On the other hand, localization through RSSI means that you have to >> estimate the distance between nodes using the RSSI measurement and a model >> of the channel. Then you use some algorithm (like simple triangularization) >> and find the position of the node that is transmitting the beacons. Note >> that you need at least 3 anchor nodes receiving with known positions, and >> another one which is transmitting the beacons. >> >> Therefore rather than configuring the MAC you just have to take the RSSI >> info from the packet. >> >> Cheers! >> Sergio >> >> On Tue, Jan 31, 2012 at 1:58 PM, obinna oguejiofor >> <[email protected]<http://mc/[email protected]> >> > wrote: >> >> HI >> I am writing my masters thesis on localisation of wireless sensor >> networks using RSSI , please can anyone tell me how i can manually >> configure my IEEE 802.15.4 telos B mote inother for it to be aware of its >> location without using gps. >> >> _______________________________________________ >> Tinyos-help mailing list >> [email protected]<http://mc/[email protected]> >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> >> >> > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >
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