What I want to build is an outdoor weather sensor that measures temp, humidity, rain, wind speed and wind direction. UV or sunlight measurement would be nice. I want the sensor to be a wifi node on my home network, transmitting a TCP stream. I happen to have AC power available where I want the sensor to be, so wifi is feasible.
My current thinking is a Raspberry Pi for the processor, because it's cheap and I can plug a USB wifi device into it, and (probably?) use the small set of GPIO pins on it to gather data from the sensors.
That leaves the problem of: where can I buy (inexpensive) sensors, and what electrical interface do they provide? In a perfect world, someone would make a sensor array with a USB interface, but I doubt that exists. Can folk make recommendations, and/or warn me off this approach because they know it's failure prone?
If the total price exceeds a Davis weather station with USB interface, the project has failed.
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