Check out this really neat project shared by mvencelj on Instructables:
A friend needed a light for a basement storage room with no mains electricity available.
Wishes:
assume 1 minute of ON time per day,
works from cheap and common batteries,
long battery life (1 year+),
possibly hands-free operation.
I decided to use a widely available hobby PIR sensor board as the switch and design around that, aiming for 2 years of battery service.
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