Thanks for all the interesting answers :-). One of the points of this question (besides lifetime testing!) was to challenge one of the assumptions in security - the big influence of asymmetric cryptography (such as public key cryptography and identity-based cryptography) in the lifetime of a sensor network if crypto is used for normal operations (e.g. to send control information from the base station). If the application can support the existence of "bigger" and "heavier" nodes (equipped D batteries), then an application designer can consider using PKC/IBC for long-lived applications.
Well, back to the drawing table... thanks again! Regards, Rodrigo Roman http://www.lcc.uma.es/~roman Siirtola Harri wrote: > Since this is already titled "offtopic", I'll add that dropping > voltage from 7-9V to 3.3V with a regulator is quite inefficient, > turning lots of capacity to heat. > A much better way is using a buck DC-DC converter. > > Regards, > > Harri > > ------------------------------------------------------------------------ > *From:* [email protected] > [mailto:[email protected]] *On Behalf Of > *Jacob Sorber > *Sent:* Thursday, May 07, 2009 10:05 PM > *To:* Denis Smorgon > *Cc:* Rodrigo Roman; [email protected] > *Subject:* Re: [Tinyos-help] R: (offtopic) D batteries in sensor nodes > > You are referring to 6 D cells in series, right? (1.5V * 6 = 9V) > > Yes, nominal voltages vary a little with battery chemistry, but the > point is that, if you use 2 AA batteries without any problem, you can > change to 2 D cells without any power supply changes. Just use the > same chemistry you were using before. > > Also, in case it helps, wikipedia has a good list of voltages for each > battery size and chemistry. > http://en.wikipedia.org/wiki/List_of_battery_sizes > > -Jacob > > On Thu, May 7, 2009 at 1:15 PM, Denis Smorgon <[email protected] > <mailto:[email protected]>> wrote: > > D battery for alkaline model has 9 V of nominal Voltage and Ni Cd > or NiMh have 8.4 V so you have to pay attention and check if your > sensor board accepts this voltage. On my application I use a Li > Ion 7,5 V battery and for reducing its voltage a voltage regulator > is used because MDA320 accepts input voltage up to 5 V but Xbow > recommends 3.3 V. > > Denis > > ------------------------------------------------------------------------ > *Da:* [email protected] > <mailto:[email protected]> > [mailto:[email protected] > <mailto:[email protected]>] *Per conto > di *Jacob Sorber > *Inviato:* giovedì 7 maggio 2009 18.38 > *A:* Rodrigo Roman > *Cc:* [email protected] > <mailto:[email protected]> > *Oggetto:* Re: [Tinyos-help] (offtopic) D batteries in sensor nodes > > The only difference will be lifetime. Typically, standard-sized > batteries all have a nominal voltage of 1.5V (alk) or 1.2V (NiMH) > regardless of size, and can usually be used interchangeably. > > Jacob > > > On Thu, May 7, 2009 at 10:48 AM, Rodrigo Roman <[email protected] > <mailto:[email protected]>> wrote: > > (This question may be a bit outside the topic of this mailing > list, but > I think it may be an interesting idea for all mote users here. > Still, > sorry in advance) > > Hi all, > > We are interested on using D batteries on tinyos-compatible > "low class" > mote (micaz, iris, telosb), instead of AA batteries. Anyone has > experience on using these type of batteries?. > > Best, > > Rodrigo Roman > http://www.lcc.uma.es/~roman <http://www.lcc.uma.es/%7Eroman> > _______________________________________________ > Tinyos-help mailing list > [email protected] > <mailto:[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
