I recently bought a really cheap remote control boat. It only turns on when it is placed in water. I would like to know how it determines if it is placed in water. I could not find any sensors that detected fluid in the boat. How does a device know if it is in water and should turn on? How would it go about it?
The boat has 2 motors, each has 3 wires going to it. There is positive and negative terminals connected to the motors, and a third wire soldered directly to chassis of the engine.