Line follower
Lego Mindstorms NXT, oodles of fun:
This is not my first robot, but it's a first attempt at a line follower. On the third pic below you can see the light sensor. I have to draw a line now and write some software:
The circles in the background were drawn by my first robot, not much different from this one, improvement is in the details. It's foremost feature is it's breakdownability (essential when adding features or replacing batteries).
PC Magazine just published a nice review of Lego Mindstorms NXT (via nxtasy.org).
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