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Moist-o-meter

发布时间:2019-03-07 03:14:05来源:未知点击:

By Barry Fox Herbert Booth of Glasgow wants pot plants to tell us when they need more water, and when they have had too much (GB 2352817). A rod with two electrodes pokes down into the soil, measuring its electrical resistance. This shows whether the soil is dry, wet or waterlogged. The result is then used to control an image on an LCD screen at the top of the rod. When the soil is just right, the LCD shows a happy face. If it is too wet or too dry,