LEGO Set Up
for
Transportation Scenario I
September 2001
Build some kind of lightweight car. Place a black element or piece tape so that the sensor reading will be lower when the car passes the light sensor.


This set up is good for one or two batteries. 

With these extra pieces the motor is geared down 1 to 9 and can be run from the RCX.

The LEGO CITY is set up much like the speed trap in instruction booklet #2.  Instead of having many cars pass in front of the light sensors, one car is continually run around so that it passes through the photo gates of the light sensors and lamps.

Build a similar set up using the pictures.
The motor to run the car is in the middle of where a 16-stud beam was in the instruction booklet #2.  Replace the 16-stud beam with two 6-stud beams. Place the motor set up as pictured. Build a car and connect to motor set up with axles.  A 10 and a 12 axle connected by an axle connector is sufficient.

Program the RCX to gather light sensor readings. 
Try out your set up at school (or home) to get an idea of what the light readings will be.  Note that graphing light sensor at one second can miss many passes of the car.
 
 


Write and run a program to save to add 1 to the red container each time there is a decrease in light sensor reading. 
The actual set up for the CAR COUNT at the SENSORS CITY will some times be with batteries and sometime be programmed for variable speeds. 
Can you figure out what it is today?

Examples using LEGO Dacta Team set.
Back to Transportation Scenario I Car Count page.
Pictures of example programs.
LEGO Links of  Linda Hamilton
31 September 2001