ir sensors from scratch line follower

  
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To get a good voltage swing, the value of R1 must be carefully chosen. If Rsensor = a when no light falls on it and Rsensor = b when light falls on it. The difference in the two potentials is: in presence of light and a very large resistance in absence of light. We have used this property of the sensor to form a potential divider. The potential at point 2` is Rsensor / (Rsensor + R1).
ir sensors from scratch line follower - schematic

Again, a good sensor circuit should give maximum change in potential at point 2` for no-light and bright-light conditions. This is especially important if you plan to use an ADC in place of the comparator To get a good voltage swing, the value of R1 must be carefully chosen. If Rsensor = a when no light falls on it and Rsensor = b when light falls on it. The difference in the two potentials is:



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