Your iPod nano has a $20 Li-Poly battery and your mote has a $0.20 AA battery. You're expecting identical performance????
-Joe On 5/25/06, Chang Li <[EMAIL PROTECTED]> wrote:
I bought 8 AA batteries in the 1 dollar store. It only run 20 hours then the leds were dim. The voltage of the battery was under 2.0v. 18.2+mA is the current consumption of CC 2420. There are MSP430 and Flash Memory as well as othere ICs. I am wondering why have tested the current of 50 to 60 mA with Rx and Tx enabled. My iPod nano with LCD,1GB Flash, and Li-Poly battery can even run 14 hours. I have expected that a mote should consume much less power than an iPod. Some special programming skills may be required to save power of motes. Chang >6 days sounds about right. When the radio is turned on and simply > listening, it is consuming an average of 18.2+ mA - your 18.8 mA sounds > accurate. I measured it to be about 437.4 mAh/day. With 1500 mAh > batteries > and those measurements, you're looking at about 3-4 days lifetime. > > Duty cycle the radio and you'll get many more days. At 0.23% duty cycle > with a cc2420 radio duty cycle period of 10 seconds, the lifetime of a > tmote > should be about 300+ days at 1500 mAh. > > Keep in mind that batteries are rarely what they say they are - 1500 mAh > is > the minimum guaranteed by the manufacturer. Many batteries can > potentially > last much longer than what they're rated, especially depending on the > environment and type of battery. > > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > [EMAIL PROTECTED] > Sent: Wednesday, May 24, 2006 9:27 PM > To: [email protected] > Subject: [Tinyos-help] tmote batteries lifetime > > > > I have one doubt about tmote batteries duration. I'm using tmote sky > with 2 AA 1500 mhA batteries. If i not use any LPL on cc2420 the rx > consumption would be about 18.8m A. So the energy in one second would be > E = 3V . 18.8 mA . 1 s = 56.4 mJ > > I have read the joe paper about b-mac where says that > t(s )= Cbatt . V.60 . 60 / E > > It gives me about 6 days of bateries duration. Would it be right? I > suposse that radio is always in rx mode waiting... Am I wrong? > thanks a lot > > > _______________________________________________ > 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 _______________________________________________ Tinyos-help mailing list [email protected] https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
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