In this activity, design, construct and program an RCX or NXT dancing
robot that has at least two moving parts and at most two motors. Set your
robot's dance to music.

In this activity, design and construct an RCX car that can bridge a one
foot gap without falling.

In this activity, design and construct an RCX fan with 2 touch sensors
and program it to run at variable speeds and have a stop/start function.
See the "Fan-Tastic" PDF for Detailed Instructions

In this activity, design and construct an NXT fan with 2 touch sensors
and program it to run at variable speeds and have a stop/start function.
See the "Fantastic - NXT" PDF for detailed Instructions

Using a sound sensor and an NXT car, design a robot that moves forward when a person claps somewhat softly, and stops when a person claps loudly.

Collect and display sound data from the NXT sound sensor in real time on the LCD display of the NXT. Also include the ability to pause the data collection by bumping a button to view a particular screen of data until another button is bumped.

In this activity, a group of students each build an RCX robot. Each RCX is assigned a number. It will then have to tag the other RCXs with the number by using mail. 5 tags and the RCX takes on that RCX’s number. The winner is the RCX that has given its number to the most other RCXs at the end...

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...

In this activity, design and construct an RCX car and program it to travel in a straight line until it hits a wall. Once it hits the wall, program the car to reverse direction and continue until it hits another wall at which point it stops.

In this activity, design and construct an NXT house which utilizes sensors. For example, have the house greet oncoming cars by turning the house lights on.