Simple Water Alarm

Project Number: 98

OBJECTIVE: To sound an alarm when water is detected.

Description: Build the circuit shown but initially leave the jumper wires outside the cup. Turn on the slide switch (S1); nothing happens. Place the jumper wires into a cup of water and an alarm sounds! You could use longer wires and lay them on your basement floor, if your basement floods during a storm, then this circuit will sound an alarm.