NXT motors are very easy to use, because of their built-in encoders. But, sometimes kids want to understand, or the teacher desires to explain how to collect information from a rotating axle. (The sensor has got its name because it is made of a light sensor and a sheet of paper only.)

Acceleration is a physical concept that is difficult to understand, although you can feel
it when driving on a roller coaster. This sensor might help kids to realize how
acceleration can be quantified. It got its name, because it is made of a few LEGO pieces,
the RCX, and some n...

Robotics in the greenhouse
Monitoring of microclimatic variables in a greenhouse using
Technology Robot Lego Mindstorms NXT.
The robot is equipped with three sensors, temperature, light and a
relative humidity sensor.
Control is a mobile robot with two sensors...