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I'm in the process of building a weather station, and I like your compact anemometer. I was curious about the circuit you designed to measure the speed of the rotation. I understand you're using a Hall latch, but is there anything you do to the rod so that it triggers the latch? From the picture, it seems that you have just a threaded rod over the hall sensor, and I was wondeirng if that's all you used to get a reading.

Also, do you use the same circuit for both the anemometer and rain gauge?