I can use this to warn me if someone is in a close range of my Christmas tree putting presents under there. Using the new RGB color sensor available at DFRobot, I rigged up a simple proximity alarm. Regular power extension lead (with some modifications) I made this motion detecting Christmas tree light setup that only turns on when people are nearby. With all the lights and decorations that people use at Christmas, power is left on all the time and electricity bills skyrocket.
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