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A persistence-of-vision robot. Small 'bot built into a CD case (photo with cover off). It roams around, searching for a black tape line (kinda like a line-follower). However, when it find the line it spins *very* fast and the 7 leds are used to show POV text. The black line is used as a "marker" while spinning to sync the beginning of the text line so that it doesn't drift (even as the batteries wear down). The same single line sensor is used for detecting table-top edge so it doesn't ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/mr-spinny-with-new-pix