My Lego Mindstorm Builds during early days...

This is a robotic dog made out of lego. It is equipped with 4 motors, a gyro, and a ultrasound distance sensor

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Key Learning: autonomous walk and perimeter scanning, auto stop, fall avoidance and course correction.

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This is a Rubik's Cube solver that I created out of LEGO. It utilizes 4 motors and a color sensor in order to scan and manipulate the cube until it is fully solved. It isn't the fastest solver in the world, but it consistently gets it done.

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Key Learning: Color detection, face mapping, algorithm calculation.

I made a tank shooter using 2 motors for movement and 2 to rotate and fire the turret.  It is equipped with an ultrasound distance sensor and utilizes a color sensor to detect gaps or holes in the ground. It is also controllable via a controller.

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Key Learning: fall avoidance, obstacle detection, wireless control, 

I made a mars rover out of lego that utilized almost every component in the box, all 4 motors, both sensors, and the hub/gyroscope. It utilizes the motors for movement but has a rod with a ultrasound sensor to detect obstacles. It also has a oscillation arm with a color sensor to detect various different objects

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Key Learning: Color detection, object detection, pathplanning, "safe-zone" logic

I designed my own sports car using parts from several different sets