Arduino base parking system - Simple Arduino Based Automated Parking Lot System - page 44

led_statuse function
This function determines the state of green and red LEDs. If there is any vacant slot in
the parking lot, the green LED is turned on. Otherwise, the red LED is turned on. The red
LED blinks at a slow speed under this condition, and if a car tries to enter the parking lot,
the red LED starts to blink at a higher speed.