noob with roomba and arduino. optical sensor question

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i'm sure basic question got arduino.  i'm intrested in building balancing line following robot.  have old roomba tore apart parts.  see uses number of optical sensors.  question led , how if configure them arduino?  understand 1 led emitter , 1 receiver , sense change in reflectivity of surface how know which , how wire them work arduino?

thank you
voices

can upload picture of sensor, or @ least count wires coming it? i'm not familiar inside of roomba.


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