Are these the modifications that you described in http://webs.cs.berkeley.edu/tos/hardware/diode_html.html ? If so, they're currently they're linked off the hardware page under the description
Modifications required on the Mica to use the 'snooze' component. and I can make that more descriptive. -kw ----- Original Message ----- From: "Joe Polastre" <[EMAIL PROTECTED]> To: "'Robert Szewczyk'" <[EMAIL PROTECTED]>; "'Rong Zheng'" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Sent: Thursday, October 09, 2003 3:14 PM Subject: RE: [Tinyos-users] Discrepancy in power consumption numbers > If you're on the mica, there's two resistors you have to remove too that > contribute up to 400mA worth of power. Certainly if the sleep current was > 1mA, our system described in the WSNA'02 paper would not have lasted 4+ > months ;) > > -Joe > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Robert > Szewczyk > Sent: Thursday, October 09, 2003 2:09 PM > To: 'Rong Zheng'; [EMAIL PROTECTED] > Subject: RE: [Tinyos-users] Discrepancy in power consumption numbers > > Rong, > > How did you measure these numbers? There are a number of things that > will affect the measurements: > > - input voltage and boost converter. Boost converter essentially > eliminates the ability to operate in sub-100 uA regime; for the > measurements in the WSNA paper we did turn it off (we added a diode > bypass). Likewise, different input voltages will operate at different > efficiencies of the converter. Conversely, if you are bypassing the > boost converter altogether (the mote will operate from 2.7 to 3.3V) will > change the numbers quite a bit. > - software -- in some versions of TinyOS, there was an IO pin conflict > that resulted in motes drawing excess power. It has been fixed a number > of times, but unfortunately it keeps reappearing. In general, the > configuration of IO pins will have a large impact on the power > consumption. > - HW configuration -- I doubt that this would have affected you, but it > is possible. Mica with Atmega128 can be configured to run with an > internal RC oscillator at frequencies up to 8MHz. At these frequencies, > the idle and active power consumed by the processor would be > significantly larger than those published in WSNA. > > Let me know if I can be of further assistance. I would be curious to > see what caused these discrepancies. > > Rob > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Rong > Zheng > Sent: Wednesday, October 01, 2003 9:08 AM > To: [EMAIL PROTECTED] > Subject: [Tinyos-users] Discrepancy in power consumption numbers > > hi, > > I recently did some measurements of the power consumption of Mica 128 > motes. Here are the numbers I got, (all the numbers the power > consumption of the entire system in particular state listed below) > > lower power (snooze) 0.97mA > idle (with radio disabled) 4.97mA > idle (with radio enabled) 11.30mA > Tx (send raw RF through SpiByte) 12.90mA > Rx 7.78mA > > The numbers are different from the ones I found from the ones given in > WSNA'02 paper. In particular to receive an AM packet consumes roughly as > > much energy as transmitting an AM packet (see the attached eps files). I > > wonder if there is anything wrong with my measurement methodology. In my > > experiments, I removed all unnessary components. > > Thanks! > > Rong > > _______________________________________________ > Tinyos-users mailing list > [EMAIL PROTECTED] > http://mail.Millennium.Berkeley.EDU/mailman/listinfo/tinyos-users > > _______________________________________________ > Tinyos-users mailing list > [EMAIL PROTECTED] > http://mail.Millennium.Berkeley.EDU/mailman/listinfo/tinyos-users > > _______________________________________________ > Tinyos-users mailing list > [EMAIL PROTECTED] > http://mail.Millennium.Berkeley.EDU/mailman/listinfo/tinyos-users > _______________________________________________ Tinyos-users mailing list [EMAIL PROTECTED] http://mail.Millennium.Berkeley.EDU/mailman/listinfo/tinyos-users
