WSN for car park management system

Guys I need to manage a car park using WSN, I am thinking to use CC2420 zigbee chipcon can you suggest me which sensor is compatible with zigbee kits that can detect the movement of cars as well ??

wouldn’t it be easier to start with a 15.4 module like XBee or Jennic or some such, versus a bare chip that’s not FCC legal?

The XBee, for example, has firmware ready to go to monitor analog an digital events and send sample/change data to the coordinator (connected to a PC). The only code you’d write would be on the PC or controller using RS232 or USB

PS: pardon my ignorance, but what’s WSN?

stevech:
“PS: pardon my ignorance, but what’s WSN?”

Wireless sensor network?