Specific solutions to specific problem from World Robotics Olympiad. The Olympiad has different categories and levels and we gather all the robotics solutions in this category
Tutorials and lessons using Arduino Electronics Kit. Programming with a C-style language, using electronic elements, different physics around current, voltage, resistance.
With the use of ultrasound the LEGO Mindstorms EV3 & NXT Ultrasonic sensors could detect the distance to an object. You can use it in many different ways most of them very interesting and fun. Some of them a little more challenging, but rewarding.