Need circuit -counting pcb's in the conveyor

:idea: Hi All,
The PCB's are going through Conveyor.
I want to put a sensor in the conveyor and every sensing of the pcb,
one count to be added.
like this i want to make a circuit so that i can come to know how many boards are passing through conveyor.

Is anybody having any idea how to build the counter circuit using sensors?

use counter (such as omron H7EC-xxxx) and photo sensor of your
choice (like E3Z-R86 from omron). and you will need power supply
(maybe omron can help with say S82K-1524 or similar...).