Uni Project: Line follower
This was a project I did with 2 other students at university, it's a line following robot with ultrasonic sensors to prevent it from crashing, it uses visual spectrum active sensors to detect the line. All the circuitry is designed and built by ourselves. Details of the project can be found in the Report.
Not much more to say on the matter, so here are some photos:

The robot, the little yellow LED flashes whenever it's moving.

The inside, with custom made circuit boards.

The underside, with my uber sensors.