Hi!1 >>> Yes, but in that case you might as well just purchase a coulomb >>> counter with a built-in accumulator and an I2C/SPI/microwire interface >>> save yourself some PCB space and cost (maybe) Hardware is already given. >> Well, Pavel attempts to implement a "poor man's Coulomb counter" or at >> least "poor man's Ampere meter" for devices that are not equipped with >> any of it. > > I think the "poor man's Coulomb counter" is a loser, the errors will > overwhelm you too rapidly. The estimated rate of discharge could >> work, Actually android phones do "poor man's Coulomb counter", and it seems to mostly work. > based on what clocks, regulators and so on are running, but I am not > sure how useful that number is really given you can't realistically > integrate it due to the big error it is bound to have. ... > Otherwise for L-ion batteries, looking at the voltage level alone, > filtered to remove GSM transmit slots etc, is really quite workable for > estimating charge status. Well, you have to compensate for backlight power; and yes, that's what I'm trying to do. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-embedded" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
