I hear a lot of complaints about rain sensors not working. Usually the problem is easily figured out. It’s important to understand what a rain sensor actually is and isn’t.  The term ‘sensor’ itself is misleading. Rain sensors do not ‘sense’ rain. Merriam Webster defines ‘sensor’ as “a device that responds to a physical stimulus (as heat, light, sound, pressure, magnetism, or a particular motion) and transmits a resulting impulse (as for measurement or operating a control)” This is  not […]