Hi David,
I used oscilloscope to check the power consumtion. I am measuring voltage drop across a small resistor connected in series to the Vcc input from battery. Following are the results I get with CTP-LPL in micaz: Current ^ | <-T1 -> | |-----| |-------|C1 | | |<-T2-> | | | ----| |-------| |-----C2 --------------------------------------------> time T1 = time period when current consumption is high T2 = time period when current consumption is low C1 = Current when mote is in wake up mode C2 = Current when mote is sleeping Case 1. RxSleep = Localsleep = 1 sec Periodic packet sending period = 1 sec Power consumption: T1 ~= 132ms, T2 ~= 820ms, C1 ~=28.4mA, C2 ~= 4.4 mA Case 2. RxSleep = Localsleep = 1 sec Periodic packet sending period = 10 sec Power consumption: T1 ~= 1s, T2 ~= 20s, C1 ~=28.4mA, C2 ~= 4.4 mA In case 2, the graph in oscilloscope was not very consistent. The values of T1 and T2 were changing a lot. Also there were approx 10 spikes in the region where mote was sleeping. I guess it was due to the periodic beaconing in CTP routing protocol. Also there were few packet losses. The above stated values are average values. Case 3. RxSleep = Localsleep = 10 sec Periodic packet sending period = 10 sec Power consumption: T1 = 3 to 10s, T2 = 50 to 80s, C1 ~=30mA, C2 ~= 6.8 mA In case 3 also, the graph in oscilloscope was not very consistent. The values of T1 and T2 were changing a lot. Also there were approx 20 to 40 spikes in the region where mote was sleeping. Also there were many packet losses. I tried with LplUnicast and LplBroadcast also. In that case the sleep current was ~=400uA. This is also not very low but is fairly good. I am not able to find why there is so huge diffenrence in power consumption between CTP and LPLUnicast. Regards Ravi --- David Moss <[EMAIL PROTECTED]> wrote: > Hi Ravi, > > What is the rxInterval you're setting? And what are > you using the measure > the current consumption? > > -David > > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] > On Behalf Of Ravi > Prasad > Sent: Friday, August 03, 2007 2:30 AM > To: [EMAIL PROTECTED] > Cc: Philip Levis; > tinyos-help@Millennium.Berkeley.EDU > Subject: Re: [Tinyos-help] Again!!!! Low-power > CC2420 multihop in > TinyOS2.xquestion???? > > > > Hi Roman, > > Thank you. > > Have you tested your modified CTP using CC2420LPL?? > What was the power consumption?? > > I also used another approach ( a dirty quick fix, > but > it was fastest approach) for using LPL in CTP. I > modified the DefaultLpl.nc file to use a specified > sleep period for all packets it transmitts. As every > packet passes through this layer, this sleep period > is > applied to all Tx packets. > > This approach is performimg duty cycle but the power > consumption is again very huge. The lowest > consumption > is 4mA. > > The power consumption is same as was in case when I > set the Rx sleep perion in top level application > only > for the application level packet. This I stated in > my > previous email. > > So untill now I am not able to get the 200-400uA > sleep > current in CTA. > > What do you suggest to get lower power consumtion? > > Or again same question--Do you think I should try > another multihop routing protocol over CC2420 LPL?? > > > Regards > Ravi > > > --- Roman Lim <[EMAIL PROTECTED]> wrote: > > > Hi > > > > In order to use lpl with ctp you could modify the > > ctpforwarding engine > > and add the lpl information for transmission. > > I added an interface where you can tell the ctp > > layer to use a default > > rx sleep interval for forwarded packets. > > > > roman > > > > Ravi Prasad wrote: > > > Dear Philip, > > > > > > Thank you for your reply. > > > > > > As you said that CC2420 LPL in Tinyos2.x works > > with > > > arbitrary topologies, I tried to use LPL with > > > collection protocol provided in tinyos2.0.2. I > > used > > > the LowPowerListening interface in my top level > > > application to set the sleep interval of TX and > > Rx > > > sides. The application somehow worked with one > > > transmitter & one receiver. But the lowest > current > > > consumption was 4mA which is very huge. Also the > > > initial tree formation time is very big. If I > use > > a > > > sleep interval of more than 3seconds the tree > > dosent > > > even forms and nothing works. > > > > > > I think as the CollectionTree also uses > > ActiveMessage > > > to send/receive data/routing packets, the > > > sleepinterval setting should be controlled at a > > single > > > point from where all packets (i.e routing and > > data) > > > flow, that is the ActiveMessage component. > > > > > > Can you please comment on the above? > > > > > > Also it would be great if you have some > suggestion > > to > > > use another multihop routing on top of > CC2420LPL. > > > > > > > > > Regards > > > Ravi > > > --- Philip Levis <[EMAIL PROTECTED]> wrote: > > > > > >> Ravi Prasad wrote: > > >>> Hi all, > > >>> > > >>> My need - Low power multihop for CC2420 (with > > >>> Atmega128 mcu i.e micaz).. > > >>> > > >>> > > >>> Low power CC2420 is being asked so many times > in > > >> this > > >>> list. I have been working on TinyOS1.x and in > > that > > >> low > > >>> power CC2420 was not really available. > > >>> > > >>> Now I have switched to TinyOS2.x and I know > that > > >> there > > >>> is a LPL implementation of CC2420. But it > seems > > >> that > > >>> is for a Star network topology & not used in > any > > >>> multihop routing protocol. Am I right?? > > >>> > > >> The CC2420 LPL in 2.x works for arbitrary > > >> topologies. > > >> > > >> Phil > > >> > > > > > > > > > > > > > > > > > > ____________________________________________________________________________ > ________ > > > Choose the right car based on your needs. Check > > out Yahoo! Autos new Car Finder tool. > > > http://autos.yahoo.com/carfinder/ > > > _______________________________________________ > > > Tinyos-help mailing list > > > Tinyos-help@Millennium.Berkeley.EDU > > > > > > https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > > > > > > > ____________________________________________________________________________ > ________ > Park yourself in front of a world of choices in > alternative vehicles. Visit > the Yahoo! Auto Green Center. > http://autos.yahoo.com/green_center/ > _______________________________________________ > Tinyos-help mailing list > Tinyos-help@Millennium.Berkeley.EDU > https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > ____________________________________________________________________________________ Moody friends. Drama queens. Your life? Nope! - their life, your story. Play Sims Stories at Yahoo! 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