I updated the CNZ1120 Photo Interrupter board to version 2.0. The new board is smaller and uses SMD components (only two resistors). Check it out here.
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Hobbybotics 
Is this sensor already built available on the market? where can I buy it? need a 70 pieces of this. Please let me know.
The board files are freely available if you would prefer to produce your own. I don’t currently have a web shop setup but, I am working on it.
Curtis