Take a yellow motor rotations block and store Measure->Rotations in a variable.
Travel until sensing a color
Measure->Rotations again, and subtract the value you stored in a variable earlier.

-or-

Take the yellow motor rotations block and reset it
Travel until sensing a color
Measure->Rotations 



On Mon, Nov 3, 2014 at 6:16 AM, Ralph Grove <[log in to unmask]> wrote:
Hi All,

The team wants to know how many wheel rotations the robot traveled before it senses a
color. Any ideas on how this is done in EV3 software ?

Regards,
Chinni.

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