Charger NOT EQUAL with Power Suppy

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LuckyDime
Posts: 33
Joined: Sat Apr 16, 2016 10:11 am

Wed May 11, 2016 12:25 pm

All, who have problems with stopping/restarting LP should think over, that a smart phone charger communicate with the charged device. They act like a 'smart' device too.
They have a charging characteristic with three period:

- bulk charging: maximum voltage/current for charging the battery till 70-80% of its capacity (also known as fast charging).
- absorption charge: optimised fix voltage / decreasing current for charging the battery till 98% of its capacity.
- float charging till 100% of capacity and for regenerate the battery.

Different battery capacity require different charging characteristics, despite there are 'universal' chargers, stongly suggested to use its own charger.

LP is like a PC, its need a "stupid" power supply providing max. 2A.
My guessing is that smart phone/tablet chargers can't handle the dynamic power hungers, and that's why - despite they are quality chargers - can't handle the situations.

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tasrock
Posts: 3
Joined: Thu May 12, 2016 10:59 pm

Thu May 12, 2016 11:03 pm

Is it possible to apply 5V from a real power supply to a pair of pins (Arduino pins maybe?) in order to power the LattePanda instead of using the USB connector? I am having a hard time finding any USB chargers that supply anything higher than the 2A units that I currently have which seem to have issues.

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LuckyDime
Posts: 33
Joined: Sat Apr 16, 2016 10:11 am

Fri May 13, 2016 5:10 am

I don't know is it possible to power the LP with GPIO/Arduino pins or not, but I've bought a power supply like this:

http://www.modmypi.com/raspberry-pi/acc ... 2.5a-black

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Lutz
Posts: 214
Joined: Mon Apr 18, 2016 4:30 am
Location: Germany, NRW

Fri May 13, 2016 5:57 am

tasrock wrote:Is it possible to apply 5V from a real power supply to a pair of pins (Arduino pins maybe?) in order to power the LattePanda instead of using the USB connector? I am having a hard time finding any USB chargers that supply anything higher than the 2A units that I currently have which seem to have issues.
Yes, very important question to the team of LattaPanda.
I really need to know this too !! :!: :!:

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tasrock
Posts: 3
Joined: Thu May 12, 2016 10:59 pm

Fri May 13, 2016 1:47 pm

LuckyDime: Thanks for the tip.

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LuckyDime
Posts: 33
Joined: Sat Apr 16, 2016 10:11 am

Fri May 13, 2016 3:07 pm

You are welcome :)

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strawberrymaker
Posts: 51
Joined: Sat May 21, 2016 2:26 am

Sat May 21, 2016 2:34 am

you could just rip an old micro usb cable apart and plug it into the panda, grap a multimeter and test the continuity. but from what ive seen on the panda there wasnt any kind of isolation

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strawberrymaker
Posts: 51
Joined: Sat May 21, 2016 2:26 am

Sat May 21, 2016 4:19 pm

Or i would guess that you can use that little 4 pin header named CN2 for powering.

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acasta
Posts: 23
Joined: Sun May 15, 2016 9:43 pm

Sun May 22, 2016 2:15 pm

LuckyDime wrote: (...)
LP is like a PC, its need a "stupid" power supply providing max. 2A.
(...)
There is also another solution out there: UBS charging cables like this one have a hard-wired "please-provide-max-current" signal inside.

So, with cables like this, you can use a "smart charger" as LP power supply.

Further more, this cable has the big advantages of being short and having thick wires, meaning that the voltage drop on the cable is low, leaving all the power to your LP.


-ac

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strawberrymaker
Posts: 51
Joined: Sat May 21, 2016 2:26 am

Sun May 22, 2016 3:58 pm

About the 5V Pin idea:
I have tested it, they are all connected together. so you can use anything to power the panda via any 5V Port, but use a thick enough cable and enough pins for it (~3 Power Pins) :D

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