NXT light sensor to follow line

[Patrícia Carvalhais]

Hello everybody,
I'm trying to make a line follower lego NXT robot with a light sensor, but I'm having trouble as it doesn't follow the black line.
This is the code I'm using.
What could be wrong?

[Jörg Zieren]

An easy way to follow a colored line is to follow its edge (the line has to be wide enough for that - normal sticky tape width is OK). You take note of the sensor readings on the line, off the line, and halfway on/off. Then you turn, say, left when on the line, right when off the line, and go forward otherwise (which should be the halfway case). That should work with a black line too. It's easier than following the middle of the line because when you do that, and you lose the line, you don't know which way to turn to find it again.

I wonder, though, what kind of sensor "ambient light" is - it sounds wrong. In the sim there is a "colour sensor" that works.

-Jörg

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[Patrícia Carvalhais]

Hello everybody,
I don't have a color sensor, just a light sensor.
I've also noticed that it doesn't work in the simulator, but I wanted it to work in the physical robot.

[google]

You have to use "light" instead of "ambient light".

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[Patrícia Carvalhais]

I'll try this and let you know if it works!