Why do we need a daylight sensor in Minecraft: its manufacture and use

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Consider why you need a daylight sensor in Minecraft to simplify the construction of an automatic farm for harvesting pumpkins or watermelons, or reeds. To do this, you need to connect the next block of red dust to it with a repeater at a distance of 15 and then put pistons that will push (collect) your crop. This simple solution allows you to automatically harvest once a day.