<kyak>
this usb-in-the-middle thing might affect the D+/- lines though
<DocScrutinizer05>
check the charger chip datasheet
<DocScrutinizer05>
o.O that would be bad
<DocScrutinizer05>
(datasheet) it has a nice sum up of how the signaling works
<kyak>
ha, it's up to tests then :)
<DocScrutinizer05>
the voltage drop method basically works like do increase-current until delta-voltage>0.4V; decrease current by one step
<DocScrutinizer05>
this method is _not_ safe. some chagers have no voltage drop and still they overheat
<DocScrutinizer05>
rare but possible
<DocScrutinizer05>
some notebooks are like this, they don't have voltage drop on USB port but simply break on overcurrent
<kyak>
it doesn't seem to use this method, the current and voltage are pretty stable
<DocScrutinizer05>
yeah, it's not a commonly used method, as I said above
<kyak>
it heats up, but doesn't burn hand
<DocScrutinizer05>
most common method is D+/- resistor network. Closely followed by D+/- short
<kyak>
i guess when it burns hands, it's too late :P
<DocScrutinizer05>
it's quite possible that your 1A charger has a voltage drop to 4V or even 3.5V on >1A current, and that automatically reduces the current the phone _can_ draw
<DocScrutinizer05>
can you test the voltage?
<kyak>
the usb device shows 5.1- 5.2 V
<DocScrutinizer05>
it *should* be 5V +/- a few
<DocScrutinizer05>
that's great then
<kyak>
so voltage drop is basically a protection from overcurrent?
<DocScrutinizer05>
rather a natural physical consequence of overcurrent
<kyak>
ah yeah, makes sense
<DocScrutinizer05>
not always though. See blowfuse
<DocScrutinizer05>
it blows when you connect too many heaters to your mains outlets, without voltage drop from 230V to 150V or whatever
<kyak>
i'm now getting all the phones i have at home and measuring their charge current :)
<kyak>
older nokia phone, charged it in the morning, now it wouldn't even start charging, "battery full". In your face, android!
jwhitmore has quit [Ping timeout: 246 seconds]
Ornotermes has quit [Remote host closed the connection]
<DocScrutinizer05>
wpwrak: the cat was *inside* the wing
FDCX_ has joined #qi-hardware
<wpwrak>
whoa. sloppy fabrication process ! :)
Ornotermes has joined #qi-hardware
jwhitmore has joined #qi-hardware
jwhitmore has quit [Ping timeout: 244 seconds]
<wpwrak>
but indeed. good spotting ! that also explains why he never saw it coming :)
jwhitmore has joined #qi-hardware
jekhor_ has joined #qi-hardware
<DocScrutinizer05>
hmm, another 10h PC nonstop. time for a break
<DocScrutinizer05>
you know sth is wrong with your life when the only two times you leave flat during the week are to buy new milk for coffee
<DocScrutinizer05>
I'm actually grateful we have no delivery service for groceries here
<wpwrak>
in joergtown, there is a city-wide pipe system for water (operates only once per week) and one for milk (non-stop), and coffee is traded by 100 kg bags
<DocScrutinizer05>
I prefer a third pipe system ;-)
<DocScrutinizer05>
Rohrpost
<whitequark>
wpwrak: I've spent quite a few minutes trying to think of a way to safely transfer milk city-wide
<whitequark>
until I realized what "joergtown" means