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I've recently bought an outdoor temperature sensor, specifically this one off of eBay.

I then went on to use this tutorial to hook it up using a breadboard and such. The only difference being I used a 10kΩ resistor as I didn't have a 4.7kΩ resistor.

I first used it in my room and it read about 25°C, which was perhaps 1°C or so off the room temperature, however I then put it on the windowsill and it shot up to 36°C, which I don't think is plausible today in London!

What's going wrong, is it the wrong resistor?

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Whoops, nevermind, solved it myself - didn't account for UV radiation of the sun. Rookie error.

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