Hello again guys, No reply for this problem? even any thoughts or clues? maybe I wrote it too long, my guess is the transmission range and communication power of the nodes gets less and less by passing time. has anyone faced with such a situation ever? does anyone has any thoughts about this? BTW I do lots of broadcasting in my program (one at every 6 seconds) can this be a reason for the problem?
2009/6/5 Mohammad S. Hashemian <[email protected]> > Hi all, > > I ran into a very weird problem recently. I was using Crossbow MoteWorks > framework for writing a program and installing it on some MicaZ motes. The > program was sensing some data from MTS310 sensor board and report them to > the base station. After writing the code, I picked some new MicaZ motes and > installed the program on them, everything was working fine. After one day I > had to reset the motes to change their battery, when I turned them on again, > most of them (around 80%) couldn't join the network alone, i.e. if I was > just turning that mote on alone with server, the mote couldn't find the > server, even though they were right next to each other! But when I was > picking another fresh new mote and installing my program on it and putting > it between the old mote and the server, the old mote could create a two-hop > network and send it's data to the server via the new mote! > I checked the old motes with XMTS310 program (the one which ships with > MoteWorks framework), but the old motes were just collecting the data and > sending the packets, but server never could receive those packets from old > motes (probably because the wireless transmission power of the old motes > were too low that server couldn't receive them!) > > Does any one have any idea or any clue that what might be the source of > this problem? I really appreciate any response. > > Thanks in advance, > Mohammad > > > -- > Mohammad S. Hashemian > Research Scholar/DISCUS Lab > Department of Computer Science > 254.2 Thorvaldson Building > University of Saskatchewan > (306)966-1947 > > -- Mohammad S. Hashemian Research Scholar/DISCUS Lab Department of Computer Science 254.2 Thorvaldson Building University of Saskatchewan (306)966-1947
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