Dog LEGO ROBOT to help blind people

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The target of that idea is to help blind people, by offering them a dog that only needs battery to operate,instead of bying a dog that they should feed him and take care of him.The eyes of the LEGO ROBOT DOG are made of 2 sensors,so when they capt a signal the dog will beep and change its direction to lead the blind man and not leting him to hit the wall.