I am trying to make a Water Level Switch work but I don’t know where to start. I bought it from here: http://www.seeedstudio.com/depot/water-level-switch-p-565.html?cPath=156_160
Do I need magnets to pair them with the switch or …?
How do I know when it is at the bottom of the water tank or when the tank is full?
Thank you for any input!