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True, but conceivable the ultrasonic pillars can be mounted in a way that makes it unappealing for a bird. How much does accuracy decrease when you move the pillars closer together? What's the power draw? Could this conceivable be battery driven w/a wireless interface (wireless X10, bluetooth, wifi)...

Han -- The project looks great. It definitely solves the standard problem with cups/vanes --> debris, snow, ice, birds getting in the way of data. Instead of X10, I was thinking that a 1-wire solution might make sense. I have some idea how much time/cost it would take to read sensors and log results...