The sumobot is an autonomous robot which must push competitor sumobots outside a battle arena by using a motor, ultrasonic sensors, and an LDR.
The maze solver is an autonomous robot which traverses a maze by following a wall through the use of a motor and an LDR.
This is a model of a small neighbourhood with a traffic light system using LEDs, an opening parking gate using an IR sensor, and a street lamp using an LDR.