-------- Original Message -------- From: Christopher Havel laserhawk64@gmail.com Apparently from: arm-netbook-bounces@lists.phcomp.co.uk To: Eco-Conscious Computing arm-netbook@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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On 10/06/17 06:03, ronwirring@Safe-mail.net wrote:
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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