V=IR (Ohm's Law) Put a low tolerance sense resistor (typically low resistance) in series with the battery, and measure the voltage drop across the resistor. That will tell you how much current (I) is going through the circuit. You will also need to measure the battery voltage. Then P=IV gives you the power draw. You will need some way of logging voltage readings. Some scopes work for this or you can get a data acquisition (DAQ) module (look at either National Instruments or Measurement Computing). You can also use a fuel gauge chip (like the DS2770 or the DS2751) if you want the mote to be able to measure its own power consumption.
Jacob On 8/15/07, SANG Junjun <[EMAIL PROTECTED]> wrote: > > how to measure the power on a running node? > > On 8/16/07, Jacob Sorber <[EMAIL PROTECTED]> wrote: > > > > You might also want to look at PowerTOSSIM. I don't really know how > > well it works, since I usually just measure the power on a running node > > (more accurate and fewer assumptions). Still, if you must simulate, that > > might help. > > > > Jacob Sorber > > > > On 8/15/07, Graham Healy <[EMAIL PROTECTED]> wrote: > > > > > > What architecture would you like to know the power consumption for? > > > > > > Also, If it's AVR I have used this with success in the past > > > http://compilers.cs.ucla.edu/avrora/ > > > > > > Only problem is that the power consumption is based off an average for > > > the particular mode the Atmel128L is in. > > > > > > > > > Yours, > > > Graham Healy > > > > > > On 8/12/07, SANG Junjun <[EMAIL PROTECTED]> wrote: > > > > > > > > I also want to know how to measure the power of a real node > > > > Thanks. > > > > > > > > > > > > On 8/11/07, bou ahm < [EMAIL PROTECTED] > wrote: > > > > > > > > > HELLO, > > > > > I am new to tinyos ,I work on the version Tinyos1.1.0 with the use > > > > > of TOSSIM simulator and the nesc language , > > > > > how to know the quantity of power consumed by the node sensor or > > > > > the sensor networks. > > > > > THANK YOU > > > > > > > > > > ------------------------------ > > > > > Ne gardez plus qu'une seule adresse mail ! Copiez vos > > > > > mails<http://www.trueswitch.com/yahoo-fr/>vers Yahoo! Mail > > > > > > > > > > > > > > > _______________________________________________ > > > > > Tinyos-help mailing list > > > > > [email protected] > > > > > https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > Best Regards, > > > > SANG JUNJUN > > > > _______________________________________________ > > > > Tinyos-help mailing list > > > > [email protected] > > > > https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > > > > > > > > > > > > > > > _______________________________________________ > > > Tinyos-help mailing list > > > [email protected] > > > https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > > > > > > > > > > > -- > Best Regards, > SANG JUNJUN
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