Here are building challenges for you.

Can you build a car that drives in wide circles? Difficulty: simple

 

construct a robot that hits a hand if it senses the hand. Difficulty: easy

HINT: use the ultrasonic sensor to detect the hand.

 

attach a third motor to the car and make it hold a pen for drawing a circle and then lifting the pen. Difficulty: medium

 

make a project that uses a touch sensor and an accelarometer sensor to display a crosshair on screen? If you push the touch sensor, the NXT should display the boom image file. Difficulty: medium 

 

Make a car that can search for objects, grab one, drive away then put the objet down. Difficulty: hard

HINT: use two motors for driving and one for grabbing.

 

Make a bluetooth remote control to drive a car. Difficulty: hard

 

Invent and program YOUR OWN NXT segway.

   

Needs for the challenges: One NXT 2.0 set, One pen, a second NXT brick, an accelarometer sensor