component difference


I am planning to build a line following robot. I found a neat little chip that could replace the photo-resistor Althought it comes in two format : SMSBus or I2C , could some tell me the difference between those two terms? Itook the information here:

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Maybe the light to voltage would be a better option ? I want these sensors to detect the line and make he left motor rotate faster if it want to go right.

ken O

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Ken O
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