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Originally Posted by Hitchhiker 42
I'm not sure exactly how, but I feel like directly accessing the screen's color would be more accurate and less error-prone than a color sensor, which could be affected by lighting conditions, etc. I'd love to see how this could be done (or if it can't, how it can't).
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Lighting conditions is probably the biggest issue. To the op, one way to reduce this would be to make an enclosure around the sensor so that when you place it on the tablet screen, it's the same lighting condition every time. Essentially the only light going into the sensor would be the light from the screen. This should work unless the color that the screen changes to is very similar to previous color. Also agree with using an arduino and a servo. I don't have any specific recommendations on color sensors though.