Automated Parking System

he project must have a system in which the car's driver is informed whether the parking is full or not.He is informed using LEDs(green,red).If parking is available the gate opens automatically.The counter is incremented or decremented using two devices which emit rays(one for incoming cars and the other for outgoing cars).All this must be done using microprocessor(mosty INTEL 8085).Please help me with this project.reply as early as possible.