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The amount of water decreasing day by day, people now a days wasting to much water and most of the drinking water comes in the use of agriculture this causes huge loss in fresh water so to prevent this or to decrease it and save water .We are making a rain water detector which will help us to detect the rain so that we gets active and starts preparing to collect the rain water and after that we can use that water domestic works. We can use rain water detector in different places like in malls, public places and cans use that stored water for cleaning work.