I am adding a rain gauge and possibly a wind direction/strength sensor to my weather PI. They both work by a magnet making and breaking a reed switch.
The easiest way to connect them would be by cables to selected GPIO pins, but I am unsure how long those cables can be.
Also, I could use the 3.3V from the PI or put two AAA batteries, for a nominal 3V, at the sensors, but I am unsure how much tolerance to cable voltage drop the PI will be, after all the wind sensors are at the top of a pole!
Has anybody else played around with this and can make some suggestions?
Thanks
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