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Little Free Library, part 3
January 15th, 2019
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The batter test is complete. I picked up a solar powered battery
pack off Amazon and plugged in the pi, then left it in the dark to
see how long it took to drain. It lasted just over 80 hours with
no external charging. That's fantastic!
The unit claims that it can fully recharge in about 7 hours of
sunlight. Given various seasons and overcast days, rain, etc, that
should be plenty of buffer to allow the pi to remain perpetually
active.
With that, there's only 3 things left to do:
- Update the captive portal screen to indicate to users that they
should: 1) disable their mobile data, and 2) browse to
http://littlefreelibrary. The actual domain doesn't matter, but
that one seems easy enough to remember. The mobile data thing
came up in testing as a barrier to IP rules running on the Pi
that would normally redirect you to 10.0.0.5 and serve the web
content. Captive Portal may trigger, but I need a real redirect
of a real mobile browser for downloads. If you're reading this
and making a project that doesn't need javascript or downloads,
just do it IN the captive portal. It's much easier.
- Build a weatherproof enclosure. The plan is to 3D print
something that can hold the battery and pi, or just the pi glued
on the battery, or a big glass box, or whatever. Something that
will survive in the woods and not be blocked by snowfall.
- Take pictures and "blog" the full build instructions so others
can replicate and share it. This is a cool project and I hope
others can build upon it.
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