This robot is made with parts from the lego NXT kit and some lego treads. The ultrasonic sensors are used to detect and avoide objects.
To do list:
Code the light sensor to detect the colors.
which code did you program it with? hopefully something better then the Lego programming software... that stuff sucks for precision.
Also, a hint for the light/color thing... it sees in terms of light or dark. print out this:
and use the light thing and the NXT's sensor readout option, i believe its on the main menu, called...View
wave it over a few of the different colors, then record the color and the readout number on the screen...if you are not using the programming that comes with the NXT, try giving it a range(pretend that blue gives a readout of about 231)