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This is Sebastian (A.K.A. "Sebbie"), a little palm-sized robot I built as a present for my partner since I figured it was about time I built something for her =) Sebastian wanders around on smooth desktops, floors, etc, using his two QRD1114 IR reflectance sensors to avoid going off any edges or steep inclines. The DIY IR sensor pairs on the front left and right are used for obstacle avoidance, but they're over-sensitive so Sebastian is often blinded until he's right up against the object anyway. ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/sebastian