2 digit "Car Park" counter

[Budu2299]

I need a little help.
I'm required to implement an up/down 2 digit counter circuit using 4510 + 4511 that counts the number of cars enterimg a parking lot. Im thinking of placing a laser module at the entrance and each time a car passes it cuts the laser beam causing the count to increase by one. I can use some help in figuring out how to connect this whole together

 

[Pommie]

Try this link.

Mike.

 

[AnalogKid]

I'm required to implement an up/down 2 digit counter circuit using 4510 + 4511

Why?

ak

 

[picbits]

Use two laser beams spaced a meter or two apart and only trigger when both are broken at the same time - it will save a lot of false triggers. I'd personally use a microcontroller for the counting. Is this an actual application or a school project ?