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Color sensor for some amount of time. I was able to make green Lego tiles work, if the area I covered was 2x8 (in LEGO scale, not DUPLO) bumps. I put a standard Lego scale 4x8 brick under the Duplo track piece, and then built up the exposed area to the height of the center of the Duplo track, and then put 2 green Lego tiles (1x8) on top. This worked ...

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