Quote:
Originally Posted by BearMountainBooks
Because it is a constant beam does it use more battery than the other kind?
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Doesn't seem to. The capacitive has an electrostatic field over the screen (according to wikipedia) so my guess is it's a wash in practical usage. Even with an IR e-ink if you leave it on (set it to not sleep or power down) battery life is long.
Quote:
Originally Posted by BearMountainBooks
We have a cat door bell that works on this idea. The cats break the beam and we know they are waiting to come in. When the beams break, it rings a bell. We did this because we adopted feral cats and we were attempting to get them on an eating schedule. The bell works. The cats, not so much.
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Same principle (except that the e-reader should be a little better behaved
)