Well, I recently got around to building a robot with my friends. For a start, we chose a Line Follower robot.
It’s driven by two transoptors, the output of which is used as the input for PID-based driver. It has a custom-built H bridge for the motors. We are planning on adding additional sensors on the front in order to accomplish greater accuracy. Here are some videos:
The onboard video is freaking me out 
Notice the speed and tightness of cornering 
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