9/25/2023 0 Comments Wind speed readerOn a bike, you attach a magnet to one of your front wheel spokes and then you attach the reed switch to the front fork. It's quite convenient to use a bike speedometer here, because they detect bike speed using a magnetic reed switch. I've tried a couple designs out of cut-up beer cans and soda bottles, but have not gotten anything that works well enough. In a future version of this project I hope to make my own wind cups. They have a photo on-line of their entire wind-assembly, the wind-cups you'll be getting are just the piece at the bottom of this assembly. The hub has a 1/8 inch hole for a shaft, and it has a magnet embedded in it for use with a magnetic reed switch for detecting rotation. Anyway, the wind cups are a nice plastic assembly, about 6 inches in diameter with three cups attached to a central hub. The wind cups we are using are considered "replacement parts", you might need to tell them you have one of their weather station products but you broke the wind cups. So if you'd rather just buy a nice anemometer, i'd highly recommend theirs. This is a significant time-saver over constructing your own wind cups! Davis sells anemometers and weather stations, their complete devices cost around $200 i think. Notes on the parts: For the Anemometer head we use the "wind cups" from Davis Instruments. Bike speedometer from any bike shop 2 ball bearings, 1/8" ID from any hobby shop (used in radio control models) Once you have the parts, this project should take less than three hours to construct I think. Major parts needed: Wind cups, part #7903 from Davis Instruments (cost around $15.
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