Car park monitor

Hi,

I'm pretty new to this stuff but I'm wanting to get involved. I was hoping to get some ideas on how people would tackle the monitoring of car park spaces? I have 6 car parks and I would like to monitor these spaces and talk to a webserver to show if there in use or not. Empty or occupied. From a little reading around I think I could accomplish this using and Arduino and Ultrasonic sonic sensor which will sit at the front of the car space, which is a wall.. then somehow connect the audrino to a network and go from there? Anyone think of a better way of doing this? suggestions welcome.

How close will the car be to the wall? An IR sensor might also work.

Example: http://www.adafruit.com/products/164

[quote author=Nick Gammon link=topic=191216.msg1413538#msg1413538 date=1380690184] How close will the car be to the wall? An IR sensor might also work.

Example: http://www.adafruit.com/products/164 [/quote]

thanks for the reply.

I'd say the cars will be max 2m away, probably less.

Here is an example using a distance sensor. You could modify this one to suit your needs. http://arduino4projects.com/simple-parking-sensor-using-arduino/

The commercial sensors I've seen are placed in the middle of the bay and presumably work by detecting when the vehicle is over them. I don't know whether they sense light or have a range sensor, but either would seem viable for daylight operation. Sensing whether a vehicle has driven up to a wall would be harder since ultrasonic sensors tend to have limited range and you can't control how far away from the wall the vehicle stops.

How do they stop upward-pointing ones getting covered with crap dirt?

I've always assumed those in garages pointed down from the roof....

How many spaces are there across these six car parks?

Are there barriers can't you count them in and count them out plus have a webcams for a more general security overview?

JimboZA: How do they stop upward-pointing ones getting covered with crap dirt?

I don't know, but perhaps they send somebody out to sweep the crap dirt off them every few years, or perhaps the rain takes care of that, or perhaps the sensors are not vulnerable to crap dirt.