its a simple little circuit but im completely lost when it comes to seven segment drivers and other such chips! its gunna be one of those 3 armed turnstiles you get at train stations. its going to count to 30 (so two seven segs) then there will be a green light and a red light so that once thirty is reached the green light will go off and the red will come on, there will be a time delay and then it will reset. I think im using a slotted opto to detect each person going through the gate and its powered by a 9v battery. Any help would be appreciated but if not i appreciate your time!