I said "estimate", and unless you know of a way to determine the exact voltage delivered to the sensor I suggest that the battery voltage is the only reference point available, O Mr. Snarky. Naturally I assumed the intelligence on your part to know that you'd have to take into account all the rest of the current drains on the device as well, an assumption the evidence now seems to fail to support.
Did I actually suggest that you run the sensor until the battery dies? (Checking.) Nope. Sure didn't. And you ignored the primary point of my response, there, sport. Have fun with the rest of your life, "JP". On Wednesday, March 14, 2012 8:11:17 PM UTC-7, JP wrote: > > Sorry Lew, you have no clue (outch, I just couldn't resist, > apologies). I believe you honestly try to help out here, so props for > that. > > Understand that direct battery voltage isn't used for pretty much > anything in a mobile device. It's all stepped to the appropriate > levels. Also, you wrongfully make an assumption that a sensor would > run all by itself until the battery charge is depleted. Long story > short, the battery bankshot isn't going to work, like, at all. > So that was a strikeout... Just to be clear: The unit of power (that's > what I am interested in) is VA, the unit of current is A (sayeth the > trusty documentation), which is incorrect. > > > Sigh. On a sidenote. Not suggesting Lew you did - is this what we're > getting when folks listen to the likes of Peter Thiel? Stay in school > kids please and get an education. > > > On Mar 14, 5:03 pm, Lew <[email protected]> wrote: > > JP wrote: > > > > > The Android documentation > > > > >http://developer.android.com/reference/android/hardware/Sensor.html#g... > > > > defines the units of sensor power as mA. That's milliAmps, which is a > > > unit of electric current, not power. Can anybody in the know clarify > > > the units delivered by getPower(), or confirm that this is indeed > > > electrical current (somewhat less useful)? > > > > What is the battery voltage? > > <http://www.grc.nasa.gov/WWW/k-12/airplane/ohms.html> > > > > Batteries are rated in mAh, or (3.6 coulombs) units, a unit of charge. > An > > advantage of getting "power" in mA is that you can estimate how long the > > sensor can run if you know the battery's charge capacity. > > > > You can trust the API docs - they are authoritative (or should be). They > > say "mA", as does every source I've Googled. (You did do a web search > prior > > to asking here, did you not?) For example: > > <http://books.google.com/books?id=RuN0jb4YASwC&pg=PA895&lpg=PA895&dq=a...> > > > > > -- > > Lew -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
