PDF tutorial(more than 22 lessons) and clear listing in a nice package The most economical kit based on Arduino platform to starting learning electronics for those ...

Getting a robot to stand on two wheels without tipping ... shows how to make one with just a few common components, an Arduino, and a bit of patience fine-tuning the PID controller.

Some things do need to be connected though, such as the Arduino and other wires, but from there its easy to program the robot to do any number of tasks such as obstacle avoidance and maze navigation.