The RG11 Optical Rain Gauge is a novel, futuristic and relatively inexpensive optical rain sensor good for hobbyists and experimentalists, including those who need a sensor to trigger some ...

Now you can find out how hard it is raining outside without leaving the confines of your mancave/womancave. Pictured above is the sensor portion of what [Frapedia] calls his visual rain sensor. Mos… ...

We can do this with a digital rain sensor. Grab a CD case and some copper tape – useful stuff that both conducts electricity and sticks to a surface.