I'm building a bar/wall and want to detect human motions along the X-axis, so when people pass by, I can track their position and can animate for example googly eyes on a monitor to follow them.
The thing is, I really doint have mutch space. So I thought I could maybe line up some proximity sensors (http://wiki.bildr.org/index.php/LV-EZ1) side by side. But they are fairly expensive and huge. I thought more of something in the size of a light sensor . Does someone know if this would work, if people pass by in a distance from 0-100cm/0-3feet? Or are there other ways to achieve this?
Im kinda lost.