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Groups > comp.mobile.android > #33377
| From | crankypuss <undisclosedUserid@gmail.com> |
|---|---|
| Newsgroups | comp.mobile.android |
| Subject | Re: How does an app estimate charging current? |
| Date | 2016-08-15 06:31 -0600 |
| Organization | manana |
| Message-ID | <nosdg8$dku$3@dont-email.me> (permalink) |
| References | <nor8g4$jh1$1@gioia.aioe.org> |
On 08/14/2016 08:13 PM, Aardvarks wrote: > I'm having a problem that my Samsung S3 is not charging from the charging > cables (multiple cables, multiple chargers). > > When I install battery charge apps, they report 0 ma when the cable is > connected. > > But, there is no ammeter inside of a Samsung phone, right? Probably not as-such and software-readable, but the phone has no means of determining when the battery is fully charged other than measuring the current flow, so something's measuring it, whether or not that something is programmable. There is an order-of-magnitude difference between really good charging circuitry and something that will charge a battery, and your Samsung phone is consumer-grade electronics, which implies that it's on the lower-end of the spectrum from something that squeezes the most juice into the battery in the shortest time. Offgrid battery charging systems can get quite exotic in their measurements, doing things like applying various loads to the battery and measuring corresponding current flow, etc etc. Your phone is doubtless more straight-forward than that since its intent is to procure profit for the manufacturer to make the next generation of quickly-obsolete profit-gathering technology. > > So, how do the apps compute their charging current? Most likely the hardware generates a few charge-related interrupts, like "no voltage", "no current", and "charging", which in an Android machine get filtered through the bowels of the JVM and are eventually serviced by code that stashes the data for later app use. > Is it accurate? > You can buy a USB tester for about $10 US that will show you the actual volts and amps. I'd say that if your phone isn't charging, the first thing to check is the voltage level output by the charger or USB port you're trying to charge from. If you're in a hurry and want to sacrifice a USB cable to the gods of multimeter connection, you could dig around a bit and find the appropriate USB connector pin-out diagrams somewhere (or maybe look for red and black wires for starters). -- http://totally-portable-software.blogspot.com [Sat Mar 26: "Documentation and Portability"]
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How does an app estimate charging current? Aardvarks <aardvarks@a.b.c.com> - 2016-08-15 02:13 +0000
Re: How does an app estimate charging current? crankypuss <undisclosedUserid@gmail.com> - 2016-08-15 06:31 -0600
Re: How does an app estimate charging current? David Taylor <david-taylor@blueyonder.co.uk.invalid> - 2016-08-15 17:37 +0100
Re: How does an app estimate charging current? Aardvarks <aardvarks@a.b.c.com> - 2016-08-16 05:13 +0000
Re: How does an app estimate charging current? crankypuss <undisclosedUserid@gmail.com> - 2016-08-16 05:28 -0600
Re: How does an app estimate charging current? Aardvarks <aardvarks@a.b.c.com> - 2016-08-16 13:43 +0000
Re: How does an app estimate charging current? crankypuss <undisclosedUserid@gmail.com> - 2016-08-17 04:59 -0600
Re: How does an app estimate charging current? David Taylor <david-taylor@blueyonder.co.uk.invalid> - 2016-08-16 17:07 +0100
Re: How does an app estimate charging current? Nigel Wade <nmw@local.domain> - 2016-08-17 15:50 +0100
Re: How does an app estimate charging current? Aardvarks <aardvarks@a.b.c.com> - 2016-08-17 17:12 +0000
Re: How does an app estimate charging current? crankypuss <undisclosedUserid@gmail.com> - 2016-08-16 05:22 -0600
Re: How does an app estimate charging current? pamela <invalid@nospam.com> - 2016-08-16 21:07 +0100
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