TT Electronics’ OPI165, OP230, OP240, OP500, OP550, and OP800 were successfully used in currency validation in an ATM. Our custom needed currency validation based on various physical and optical properties. They also required precise electrical output based on light input. Our complete system of 3 binned LED and photosensor pairs that precisely tracks the unique signature of a bill, the edge and position helped solve their challenge. The customer chose to work with us because we offered them narrow opto-electrical output range the met their unique and complex requirements.