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I find it hard to map the LED lightness. I tried to detect the range of photo resistor using photoCellReading, finding it to be among 500 to 1500. However, I tried to map the LED lightness to this range, it still doesn't work so well.  Maybe because I'm in the library and the ambient lightness is not so ideal. I also found we should be careful with the resistor. Incorporating the right one in the right place takes time.

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