How can I create a sign that has components that rotate based on a persons proximity? Answered
I want to create a sign that is 48"x 24" that is broken down into 4" squares. I want each square to rotate or flip so that one side has a message and on the other side is an entirely different sign. I want the squares to rotate at random so that they full flip to one side or the other. The rub is the following. I want the sign to be spaced so that at a given distance (300 feet) the sign has one message. As the person walks closer to the sign, it is triggered so that the squares flip and a new independent sign is seen on the other side.
I dont care about material or cost (generally) I was thinking along the lines of the old train station signs in Europe that flipped over as trains arrived. However I I want the sign to be triggered by a individual getting closer or further away. SO that if the person walks 10 feet closer to the sign, perhaps 3 more squares are flipped around, and if they go back in distance to where the started, the squares would flip back to the original point. I was thinking either passive radar or sonar, or lasers across points of embarkation.
Please I need help!