Someone posted this here (I think) a while ago: http://www.powerstream.com/AA-tests.htm Buncha neat discharge curves for different chemistries. MS
Paul Johnson wrote: > Akankshu, > > To the best of my knowledge there is no sure-fire way of determining how > much residual energy the batteries contain. I believe the MicaZ has the > ability to take ADC measurements on the battery voltage itself (using > some regulated voltage as a reference). However, this won't exactly > correlate with energy reserves of the battery as most batteries supply a > constant voltage until they are very near the end of their reserves. > > Most likely the best you can do is look at the datasheets of each of the > components, determine how much energy they use while on or in any other > mode(varying sleep modes for microprocessor, etc) you use them in, and > try to keep a running tally of your guess as to how much energy that > mote has used. Using this internal tally you can make decisions based > upon energy usage. > > With hardware diagnostic tools (Ammeter, etc) you can measure how much > current the motes are drawing, and by integrating the current you can > get the energy consumed. However, any low power devices are probably > not going to have this functionality built-in(the micaz included). > > -Paul > > Akankshu Dhawan wrote: >> Hi All >> I want to know what is the best way to get the residual battery >> (energy) on the MICAZ motes ? I need to calculate this intermittently >> and based on the value make some decisions so I really need this. I >> would appreciate if someone who has worked on similar issues can guide >> me with this >> >> >> Thanks >> Akankshu Dhawan >> >> -- >> First they ignore you, then they laugh at you, then they fight you, >> then you win. >> - Mahatma Gandhi >> ------------------------------------------------------------------------ >> >> _______________________________________________ >> Tinyos-help mailing list >> [email protected] >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > ------------------------------------------------------------------------ > > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
