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<\/a>The Weather Prognosticator display, running a static color test<\/p><\/div>\n
Enter the Weather Prognosticator! (Okay, right now it’s just a Temperature Prognosticator; I still need to add precipitation.) An Arduino Uno and Ethernet shield connect to the weatherunderground.com API<\/a> to pull an hourly forecast once every five minutes*.<\/p>\n This data is translated into a color map from blue (#0000FF) through green (#00FF00) to red(#FF0000), covering temperatures from 0C to 30C.\u00a0The temperature map still needs a little tweaking; I’ll probably add purple\/white for temperatures below zero — but I’ll probably leave 30C-35C as the high end. Anything over that is not amenable to going outside.<\/p>\n Once the data has been translated into a color map, it is sent to a 1m long 30 LED strip<\/a> that I bought on sale at Radio Shack a while back. The data sheet isn’t very helpful, but with some tweaking, the provided driver functions do work.<\/p>\n This particular LED strip has ten addressable sections of three LEDs each; all three LEDs in each section are the same addressable color. In order to separate the light from each section, I designed a linear sconce, and 3D printed five copies to cover all the sections.<\/p>\n Anyway, here are the plans. You’ll need your own (free) API key from weatherunderground.com .<\/p>\n Arduino code: Weather Prognosticator 0.1 (Alpha)<\/a><\/p>\n 3D printed holder (print five of them): See Thingiverse<\/a><\/p>\n * I plan to dial it back to polling every 30 minutes once it’s more reliable. Right now, I’m still testing it, and it still pulls an all-zero forecast every so often.<\/p>\n","protected":false},"excerpt":{"rendered":" A Weather Prognosticator, to visually show the hourly forecast temperature by color. Continue reading