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“This project started as a way to prevent my pool pump/filter outdoor cupboard from freezing in the winter. I already realized that a 60w lightbulb should be enough heat in such a small volume (2 cubic metres approx), but I wanted a way to control the heating so nothing would melt either ! This is an easy job for an Arduino UNO and a temperature sensor, but I wanted a single easy to use box without any separate power supplies etc.”

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