Hello everybody.
I want my robot to move through a labyrinth.
The path he must follow is a black line. So I use the classic path follower algorithm. No problem.
On each junction I put a red mark. So when the robot see the red mark, he must stop and look at the possible ways.
And this is my problem. I have only one light sensor.
To follow the path, I use the light sensor with the sensorCOLORRED type.
But to see the red mark, I need it with the sensorCOLORFULL type.
I tried to change the sensor type on the way, but it appears to be a bad solution.
Am I doing anything wrong ?
Any idea to help me ?
Thank you (I hope you can understand my poor English !)

I answer my question by another question
Can the raw values solve my problem ? They offer a wider range of values, but they seem also dependent on ambient light. Is this right ?

Hi Jean Claude,
I'm not real familiar with the color sensor, but I have a suggestion.
Would it work to follow the line with sensorCOLORFULL when the color is black and break from that task when the color becomes red?

Dave

Thanks for your answer, but in the line follower algorithm that I use, the robot follows the edge of the line, and the sensor must be very accurate. And it seems that COLORFULL is not. It's why I thought about raw values.
I must do more tests ...