Adafruit customer Malcolm Tredinnick writes:
Tom Murphy, a physicist at UC, San Diego, writes an interesting blog about energy usage. He put a post up today about measuring accurately how much natural gas his house used for various tasks (like heating water for a shower), in the face of a woefully coarse-grained gas meter. His solution was a pretty neat MacGyver-like combination of a kitty toy laser pointer, photo sensor, dish towel and plastic shopping bag. End result were some accurate graphs of where the gas was going and then some comparison to microwave efficiency.
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