If always on, the radio will consume about 20 mA in receive mode. The Sensirion sensor has a fairly high VCC requirement (2.4V) so you won't be able to use the full capacity of your batteries. Assuming you can get about 1500 mAh from your AA cells, they'll last about 3 days. If you use low power listening at an appropriate interval, you should be able to get that down to the 1-2 mA range, so that's about 10 times better.
The GPS will be a big drain on your batteries. If size is not an issue, you could just hook them up to a set of D cells instead - those have about 7 times the capacity of an AA (Duracel Procell). HTH, Michiel > -----Original Message----- > From: [email protected] [mailto:tinyos-help- > [email protected]] On Behalf Of Jan Egil Vestbø > Sent: Friday, February 22, 2013 21:59 > To: [email protected] > Subject: [Tinyos-help] Battery lifetime experiences > > Hi > > I am about to deploy a network of about 15 iris nodes powered by 2xAA > batteries. They are connected to the mts420, 5 with and 10 without the > gps module. They poll the sensirion sensirion for humidity and > humidity, which they send to a basestation with intervals of 1-5 > minutes. This is not done synchronized as of now. The nodes run a > simple version of RPL, and must be able to relay packets. > > I have currently not implemented any power control for these nodes. I > am figuring out whether I should implement any power control. Does > someone have experience with the battery lifetime of the iris nodes. > How long can I expect the motes to be powered without changing > batteries. I am looking for a rough estimate as to whether this is > days, weeks, or months > > Regards > Jan Egil Vestbø _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
