Combination of Timers Practice Problem $($replace $7-$segment with the LCD$)$

Boxes move on a production line at a rate less than $30$ per second.

The line is monitored by an infra$-$red light and detector.

Whenever a box interrupts the light, the detector will produce a logic $0,$ otherwise it produces a logic $1.$

We are required to design a PIC based system to count the boxes that move on the production line per second.

The only information we have is the infra$-$red detector's output.

Write a program to continuously monitor the infra$-$red detector's output and display the current second$\text{'}$s box count on $7-$segment displays at the end of the second.

The PIC is operating at $8MHz.$