Discussion:
modifying a 7 inch notebook cabinet to acceptapccard
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r***@Safe-mail.net
2017-06-10 16:03:10 UTC
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-------- Original Message --------
From: Christopher Havel <***@gmail.com>
Apparently from: arm-netbook-***@lists.phcomp.co.uk
To: Eco-Conscious Computing <arm-***@lists.phcomp.co.uk>
Subject: Re: [Arm-netbook] modifying a 7 inch notebook cabinet to acceptapccard
Date: Wed, 31 May 2017 16:17:45 -0400
Respectfully, if you can't understand the protocol, you're out of your
depth and need to tackle something simpler and build up to this. Take the
scenic route, it will reward you better. Trust me -- I speak from
experience on this -- you'll wind up with a half-completed project that
doesn't work and you don't know why. I have a dozen or so of those in my
past.
It is not a big matter to me. I do not know to do any of it. I ask around. If I get
easy to understand low priced solutions, I take advantage of them.
As for the Teensy... yes, one for mouse, one for keyboard. Use a touch
panel for a small LCD for the touchscreen. There's really no way to combine
them without getting into proprietary chips from eg Holtek -- and since
those chips are proprietary and therefore expensive and hard to get, you're
thankful that you can use a pair of Teensies ;)
About the battery. If I can find an usb power bank having the right
specifications, I could then use the power bank to power the
computer and if I wanted to be able to charge the battery and
have the computer turned on at the same time, I could get
a charger with 2 usb connectors?
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Tor, the Marqueteur
2017-06-11 20:31:10 UTC
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Post by r***@Safe-mail.net
About the battery. If I can find an usb power bank having the right
specifications, I could then use the power bank to power the
computer and if I wanted to be able to charge the battery and
have the computer turned on at the same time, I could get
a charger with 2 usb connectors?
With a power bank this might work, because they (AFAIK) all have their
charging circuitry inside the power bank and take a straight-up voltage
source to charge. It won't make too much difference how you connect them
as long as you have adequate gauge wires for all connections.

If you're dealing with Li-ion cells, it's not recommended. It has to do
with how Li-ion charging works. In short the charge schedule (most
notable in a "fast" charge, meaning anything less than 5 hours or so) is
constant current at a rate the battery can handle to voltage, and then
constant voltage as the current tapers off to nearly nothing.

The upshot of this is that trying to power a device with the
battery/charger combo while charging the battery will confuse any decent
charger (and if it isn't a decent charger you SHOULD NOT use it). The
only way around this is a charge controller designed for such use that
has three sets of terminals. One for a source, one for battery, and one
for load. The charge controller is then able to distinguish the load
from the battery charge current and charge it intelligently.

Tor
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