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Originally Posted by knc1
What was your point in asking the question if all you are intending to do is dispute it?
It does not make anyone willing to take the time to answer your next question(s).
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No, I didn't intend any of that to dispute anything you guys wrote. Sorry if it came off that way. There were questions about specifics such as "number of seconds in each check and update takes" and the numbers supplied by you and Cinisajoy didn't definitely confirm or refute that the battery could hold up (assuming I was reading them correctly), so I was trying to clarify my thinking and provide more detail as to how hard I'd be running (or not running) the display and CPU.
I'm hoping you can help me take that detail and apply it to your knowledge and experience. You mentioned:
Quote:
Originally Posted by knc1
Other than that, the error in your thinking is that the Kindle does not shift to a low power mode between page turns. The only time the Kindle is actually 'running' is during the changing of the display.
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Right, but even if I'm not updating the display I can be hitting the CPU pretty hard between display changes...or not! While I don't have knowledge about the kindle devices, I do have knowledge of programming mobile devices, and if I am 100% of the time pegging the cpu at 100% on any mobile device even if nothing is happening on screen I know I'm going to suck A LOT more battery than if I don't use use the CPU much. The CPUs use more power when they're being worked. That's the power savings I'm talking about (only using the CPU a few seconds every minute), not a power savings from the device dropping to a greater sleep mode (normally screen saver time).
I
think that's what you were getting at when you wrote this: "Depending on the model of the Kindle and what communications you have enabled, the battery run-time is from 2 to 4 hours. or as you describe it; 2 hours running, 9 hours asleep out of every 11 hours." Just to clarify and be sure: does that mean if I'm running my Javascript and web page repaint for less than 2 hours of CPU time before recharging, and the rest of the 11 hour block time I have the device sitting idle (but NOT have the Kindle in sleep mode), I'm probably OK? Pardon my denseness, I'm just trying to parse your information correctly!
Quote:
Originally Posted by Yourcat
I'd expect 1-2 broken or lost Kindles during each tournament day. Do you plan to use them each weekend?
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Thanks for checking in on the theft issue. My post was getting long so I didn't go into all details of my plan, but I think I have "loss prevention" covered. As far as breaking, yeah that still could be an issue...
No, these wouldn't be used each weekend, but if all goes well I hope to have them see regular use.
Quote:
Originally Posted by Yourcat
In any case you need a central application to handle the data. You need to setup a private wifi - this could be an issue if you have a lot of clients/data.
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Right, I have a setup I've already done for a different project that I can apply to this one. It is basically a pretty nice consumer wifi router, running custom software. Connect the kindles to that router and try to open up any website. It will instead pop up with the web app I need the kindles to run. The web server and web app run on the router itself! All you need to do is plug the router into electricity. It doesn't have to connect to any outside network at all.
Quote:
Originally Posted by Yourcat
And you likely need to provide USB charging slots.
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Yeah, that's what I'm hoping to avoid and trying to live within the Kindle's battery budget, but am not sure if I can!
Quote:
Originally Posted by Yourcat
It will be 'net' based as you plan to use wifi. It may be more easy to build a web application so the users may use their own smartphone browser to get the data. I know the display is smaller but you could run the web app also in a Kindle or Kobo browser if available - so it would be completely device independent. And for finals you may use a 4K screen and show the browser/web UI there.
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I appreciate the brainstorming and if doing the custom wifi router system, nothing would stop anyone from connecting to that router and using their smartphones. This could happen whether or not we have Kindles onsite for screens. I have reasons for preferring the Kindle solution vs. a "bring your own smartphone" solution and can go into that if you're curious!
Thanks again all!