> > > I did a first estimate a while ago: > > http://lists.en.qi-hardware.com/pipermail/discussion/2013-September/010189.html > > I overlook that, sorry :P
> > Say for example, the screen is on 10 times a day for 2 minutes, with > 210mah > > from a cr2032, and a sleep consumption of 0.1 mA we can expect: > > I think we should be able to achieve a standby current < 10 uA. > The components that draw battery power directly are the MCU, RF, > and the boost converter. Each of them should be able to idle at > less than 1 uA. > So, lowering the on time to 30s and putting 0.01 ma on time: 10*0.5 / (60*24) = 0.34% of time sleep time: 99.6% of time usable battery power: 210*0.7 = 147 mAh 147/ (0.013*10+0.986*0.1)= 3343 hours = 139 days!! (I put the numbers for that people like me that're not much into the electronics world :P) > > Well, with half the daily power consumption, I estimated about two > months of daily use on a battery. According to Amazon.com, a pack of > ten CR2032 should cost about USD 2-3 and would last almost two years. > > The only reason I don't like very much the CR2032 is because of the environmental concerns :S Anyway is a good option. -- Felix
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