Hi there,
I'm a mechatronics engineer with over 7 years of experiences as maintenance and controls engineer in the automotive industry developing programs for all kind process for PLCs, microcontrollers and FPGA.
I can help you with the code and simulation of your program without problem, for example with an access gate, exit gate, sensors and indicator lamps for every parking place and a 16x2 LCD to show instructions to the users. Light in the indicated parking slot can flash to show where the car must park, etc... and every single line with comments to completely understand it.
Please contact me to solve your questions and start working.
Pedro Reynoso