Wondering what to do with your overflowing recycling bin? This oh-so-cool DIY smart phone projector will inspire little engineers to turn recyclables into inventions. There’s no stopping the possibilities in a simple cardboard box! Getting Ready To make our DIY smartphone projector, we grabbed: a small cardboard box (ours was 8 inches wide x 6 inches high x 12 inches long) a magnify glass or camera lens scissors,