By cleverly patching into the test button on an old smoke detector he created a circuit-trip alarm. One side of each piece of wire is secured to the frame and jam of a window. A paper clip ...

It’s a simple device that sits on the floor of his basement and triggers an audio alarm if water begins to cover the floor. He used an old smoke detector ... of a PVC pipe connector housing.

Use an electrical tester to verify the power is off. Twist your old smoke detector to loosen it from its mounting plate.