1) Show the parking information by its color, it will turn from green to RED when it occupied, or it will keep GREEN.
2) install led indicator in front of car park space for the convenience of the drivers' observation.
3) One park space needs one LED indicator.
2 How parking guidance system works:
Firstly, ultrasonic detector takes use of ultrasonic wave to detect the parking space to see if it is occcupied and transfer the relative commands to LED indicator which will turn from green to RED when occupied, or it will turn GREEN.Meanwhile, the UD transmits its status message to ZCU immediately. and ZCU will collect and forward the information to CCU. CCU processes these data and sends the relevant commands to ZCU and LED panel.