Please help with this Lego EV3 project

[SunZic]

Here is the problem, we have already tried something and it didn’t work.

 

Thanks

Edited December 5, 2017 by SunZic

[JopieK]

Maybe you can elaborate more on the project. Now it looks you are trying to find someone to do your homework?

[djm]

1. Go forward 70 centimetres (50 cm + 20 cm for circle radius)
2. Turn left 90 degrees
3. Go forward until the ultrasonic detector detects an object within the designated scanning ranged of the colour sensor (but no more than 20 cm).
4. Scan the colour. If it matches, go forward X cm. If it doesn't match, stop.