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Approach

The initial goal is to have the Christmas tree to detect how many people are around it. And I come up with the idea that a force resister sensor can be used to install on the floor to measure the weight and then reflect how many people are there. If only one of them is in the house, the tree only displays yellow lights. If two of them, it displays yellow and orange. When all the three members gather together, the tree displays three different colors.


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