unusual switch

I made a simple “switch” which completes the circuit when there’s a conductive fluid in between the ground and live wire. It’s a simple circuit, and there’s not much to it really. Water is not supposed to be conductive, but the tap water on campus has added minerals, so that works for this purpose. I just used the LEDs and jumper wires in the Arduino kit, and borrowed some solid core wires from the IM Lab to put in the liquid container.

I had the most fun making the demo film with my friend, though. Here’s the demo:

When my friend pees in the container with the two exposed wires which were initially not touching, the circuit is completed, and the LED lights up.