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posts about #enelooplamp more →
Sanyo Eneloop Lamp Charges Wirelessly, Doubles as a Flashlight

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nutbastard
06/30/09

In reply to Sanyo Eneloop Lamp Charges Wirelessly, Doubles as a Flashlight
"Sanyo's press release says it'll switch modes when it's turned horizontal, mentioning that there's some kind of accelerometer, although it seems like a simple activate-on-disconnect system would work just fine."

If it were a disconnect-activated thing, there's a couple ways of doing it - the wrong way, which would be to have it detect an absence of induction - which would default to flashlight mode in the event of an outage - or the right way, using a magnet and a hall effect sensor.

For the way they say it actually will be, you don't really need an accelerometer, just a mercury switch.
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