NXT Basic Car Building Instructions 
© 2008 LEGOengineering.com & Tufts University Center for Engineering Educational Outreach 
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Step B.1:  Light Sensor Assembly 
 
 
Insert a black connector peg into the first and third holes of the 5-hole beam and an 
extended black connector peg into the fourth and fifth holes.  Attach an axel joiner to the 
extended black connector pegs.  Insert a friction axel into each hole of the axel joiners 
and attach the light sensor to the friction axels. 
 
Step B.2:  Attach Sensor to the Car 
 
 
 
Attach the light sensor to the car from Step A.6. The 5-hole beam should connect to the 
top of the L-beam on the front wheel assembly.