things need:-
I) old mp3 with inbuilt speaker or ever cheap mp3 player will do.
II)Insulated copper wires.
III) solder
IV)battery 3v
V)touch switch found in CD roms.
VI)speaker motor metal strips
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the axle or the rod of the motor should be soldered with a strip of metal with a wire.
other side of the motor there should be a another strip of metal.
once the switch of the door is turn on the motor spins turning on the mp3 power wire the motor acts as a relay switch.



















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