Concept and how the switch operates
Concept: In most of the human living places in the United Arab Emirates, seawater is one of the main sources of daily water. I designed the switch so that it can let the user know when the sea water level inside the water tank is above a certain point.
How the Switch operates: Saltwater has Na+ (Sodium ions) and Cl- (Chloride ions) that help the water conduct electricity. Therefore, the two metal rods connect the two sides of the circuit through the saltwater’s conductivity, turning the LED on when the water level rises enough to hit both rods.