Hi Murali, What do you mean "On" state? If you call SplitConrol.stop(), then the radio is in deep sleep, so the current should be the lowest. When SplitContorl.start() is on, that is the radio is ready to receive messages, then the current is the highest, because the radio chip is constantly monitors the channel and tries to find the preamble, so the analog and all digital parts are running on the chip. When you are transmitting, then the radio chip has a very easy job, it just have to put out the signal, there is no monitoring, filtering and recognizing going on, so the current consumption is going to be lower than for receive.
Miklos On Tue, Feb 16, 2010 at 6:36 AM, Murali Devaraj <[email protected]> wrote: > hi there, > > thanks for replying.. i could now observe the difference in current. it > seems a little wierd now. When the radio is not in the on-state, the mote is > default in the rx mode rite? (do let me know it am wrong). When the radio is > in on-state, i varied the transmission power from 0-15. As for 15, since the > transmission power is lower, the current consumed seems to be lower than the > radio-on-state current consumption. How is that possible? whatever the > ranges are, the transmission is only done when the radio is on rite? and > this would mean that all the ranges should vary more than the radio-on-state > current consumption. > > Please do enlighten me > > murali > > On Tue, Feb 16, 2010 at 12:21 AM, Miklos Maroti <[email protected]> > wrote: >> >> Hi Murali, >> >> The actual current should be lower for tx power 15 than for tx power >> 0. However, the current consumption is dominated by the receive >> circuit (that takes more energy than tx), so you have to send packets >> all the time to see any effect. I would recommend to go outdoors and >> take two motes apart 100-500 meters and see if the communication range >> is affected by the tx power. >> >> Miklos >> >> On Mon, Feb 15, 2010 at 3:51 PM, <[email protected]> wrote: >> > hi there, >> > i read ur post regarding the setting of tranmission power for iris mote. >> > I actually tried the method which you recommend. I would just like to check >> > out, what do you mean by saying that for lower transmission power, the >> > effect should be checked over longer distances. >> > >> > I was trying to use transmissionpower.set to set the power ranging from >> > 0-15. Nothing seems to work. Please do enlighten me >> > >> > I am also trying to observe the current consumption with different >> > setting of the transmission value. All the different values seem to give me >> > the same consumption result. When the transmission power is altered, what >> > changes? The current consumed changes or the time required to send the data >> > out changes? >> > >> > Please advice. I really appreciate your help. >> > >> > Thanks >> > Muraliraj >> > > > > > -- > Muraliraj s/o Rajoo Devaraj > 93802702 > > _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
