Help needed PE/IR Sensor

[decetch]

I need to put some sort of sensor across a garage. The purpose of this sensor is to indicate when the car has passed the sensor. What I want is when the car "breaks" the beam, a light comes on. When the car has passed and the beam is restored, the light goes off.
I found the sensor below on ebay and I wondered if I can use this sensor, with a few modifications, for my purpose.
Do I need a battery with this sort of sensor? I hope I've made myself clear. Thanks.

 

[Bluejets]

That might be sensitive to sun rays.....better to use a pir relay set for whatever, day and night or night only.

 

[decetch]

Hi Bluejets, Thanks for the reply. As you can propbably tell I know nothing about this. In the PIR relay set you suggest, will this work as I described in my post? That is, light on when beam broken, light off when beam restored.

 

[Bluejets]

There is no " beam"....pir, passive infra red , detects infra red radiation. If this radiation stops moving, or goes out of range, the unit switches off.
The relay associated with this is adjustable for night and day, or night only operation and the units have built in timers which can be set from near zero to around 15 minutes.

 

[decetch]

Thanks Bluejets, Starting to get the hang of this now.

 

[bidrohini]

You can also see laser-based automatic car parking systems.