Mindboards

I have 3 motors two for the wheels and one for the ball grabber
I curently have the program working but i cant figure out a if then senerio like if i detects a ball do this and if it detects a wall do this. I am using a color light and ulteasonic sensor sensor

Need a robot that can pick up colored balls and follow a white line on the floor at the same time. Also while the robot picks up balls the color sensor should be able to tell what color the ball is. Anyone have any designs that can help me Also can only use pieces that came with the lego mindstorms ...

I need help in programming and building a robot that goes around to gather high-scoring, colored balls. There will be Ball Color white, red, blue, green, yellow, and black balls in a straight line. I need the robot to follow a white line and if it needs to pick up the ball with the highest point ...