08-08-2016, 02:00 AM
(08-08-2016, 12:40 AM)UnixOutlaw Wrote: Sorry I must have missed the first time you asked how many pins.
I actually asked here on another thread somewhere, what the specs were for connecting a battery - and NOBODY mentioned I needed a middle pin. The main reason I asked was that NONE of the pictures in any of the doco actually tell which of the 3 pins is which.
So - I hooked up a two pin 8000 mah battery to the correct pins on the board using the correct "jack"... Android charges it - but when I pull the power (micro USB) it shuts off (not cleanly - it just goes dead).
If what you're saying is correct - I will NEVER be able to use ANY of the two wire batteries I bought for projects like this (I have 4 x 2000, 2 x 2800, and 3 x 8000)? ALL of them work with NTC CHIP.
How about if I ripped a battery out of an old cell phone and ran 3 wires from it? I've got about 50 or more of the connectors (both genders)... I've got probably a dozen old phones with batteries still in them...
What sort of spec / product (links would be helpful) would I look for in a "10k resistor"? I've no idea about electronics at this level. I once had a job as storeman/two-way radio installer for a comms company... I was forever giving the radio techs the wrong parts - because I'm colour blind - all the resistors and capacitors etc all looked kinda the same to me (or hard to tell apart anyway).
Hm... I must have missed that thread... sorry about that.
I can't say with 100% certainy, but I'm pretty sure that even on Android the Pine64 would *say* it's charging the battery (as it would dearly love to if the temperature and all else if good), but it probably won't. On linux, without the resistor (or a thermistor in a three wire battery I presume) it says it is charging, but at same time says there is no current (energy) going into the battery!!!! Duh... stupid pine64!
Yeah, the NTC Chip doesn't have the thermal protection for the battery, so you could say it's better or worse, depending on how you feel about exploding lithium batteries!!! Having said that, I don't think the Chip is crash-hot how it deals with a completely flat battery - I'm nearly 100% it shorted the 5v input from the USB into the 5v output from the step-up circuit for when it runs from the battery, which blew out a diode, and did some other irreparable damage to the Chip
Anyway, for the 10k resistor, you're not after anything fancy there... it doesn't have to do any actual *work*, so can be the cheapest one you can get your hands on. Since I seem to remember from the NTC forum you're in Australia also (WA... where you had your own banana?
), you could grab 25 from a NSW ebay seller for $2.60, or you could be evil and get 10 from RadioSpares for $0.66 with free courier delivery! Have you tried charging one up with the Chip, then connecting it to the Pine64, and powering up the pine64 via the power switch connection? Might be worth giving that a shot, as the pine64 *should* be able to run from the batteries, just not charge... unless the android image configures things differently?
