Which micro-controller is easy to use and program as line follower or obstacle avoiding autonomous robot for college level competition?

All micro-controllers are going to be difficult to use, because you build your circuits around them, not vice versa. From a programmer perspective, the BASIC Stamp uses PBasic which is very easy to use and understand. The PIC16F84 Micro series uses assembly, but only has 30 commands and is much more powerful IMHO.

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