One of my better and more useful contraptions is this harbor freight solar-charged security light that i attached to my garage door and hacked a tilt switch into.
The tilt switch means the light only turns on when my garage door is open and it's dark outside. That's really helpful when I'm cleaning up in the driveway at night. When the garage door is closed, the light turns itself off.
It's been there for a few years now and it's still working great.



